Transcript
LIST Nos. CS 51EAP: F009 CS 51EA: F008 Feb. 2012 PRODUCT NAME
Hitachi Engine Chain Saw Models
CONTENTS
CS 51EAP CS 51EA
䌃 Page
TROUBLESHOOTING GUIDE ---------------------------------------------------------------------------------------------- 1 1. Troubleshooting and correction ------------------------------------------------------------------------------- 1 REPAIR GUIDE ----------------------------------------------------------------------------------------------------------------- 3 1. Precaution on maintenance, inspection and repair ------------------------------------------------------ 3 2. Inspection criteria for each section and consumable parts -------------------------------------------- 3
International Sales Division
TROUBLESHOOTING GUIDE 1. Troubleshooting and correction Trouble
Starter handle cannot be pulled.
The crank shaft does not rotate.
Cause Faulty piston ring Seized piston and cylinder Faulty crank shaft bearings
Idling stops although startup is possible.
Disassembly and parts replacement
Magneto rotor contact with ignition coil The recoil starter does Broken recoil starter not rotate. Faulty starter pawl Faulty piston ring Worn piston Expired oil seal service life No compression Worn cylinder Defective sealing of the packing Faulty decompression valve
Startup is impossible.
Corrective action
Inspection and replacement
Parts replacement
Cleaning or replacement Removal of foreign matter: In Short-circuited due to foreign matter between the spark plug case of frequent occurrence, electrodes. disassemble and clean the engine. Stop switch not at startup position Adjust to startup position. Cleaning or replacement Dirty or faulty spark plug Improperly connected plug cap Inspection and replacement Disconnected or improperly Repair or replacement connected high voltage cord Ground connection of high No spark Repair voltage cord Disconnected or faulty ignition Replacement coil ass’y Large gap between the magneto rotor circumference and ignition Adjustment coil ass’y Add properly mixed fuel No fuel in the fuel tank (25:1 to 50:1). Clogged fuel filter Cleaning or replacement The spark plug does Adjustment, replacement or Faulty fuel pipe not become wet with connection fuel after repeated Faulty vent hole (inner cap) on starting operation. Replacement the fuel tank Adjustment, cleaning or Faulty carburetor ass’y replacement The spark plug is wet Starter handle pulled repeatedly Dry the spark plug. due to excessive fuel with choke button pulled out (set Remove excessive fuel. supplied. at “startup”) Dirty or faulty spark plug Cleaning or replacement Weak spark Improper air gap Adjustment Worn piston ring Replacement Low compression Expired oil seal service life Faulty decompression valve Cleaning or replacement Revolutions too low for idling Good spark and Adjustment compression Poorly adjusted carburetor ass’y
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Trouble
The engine stalls. Starts, but when accelerating …
Poor acceleration; no increase in revolutions
Cause Clogged fuel filter Insufficient warm-up
Cleaning or replacement Warm-up
Poorly adjusted carburetor ass’y
Adjustment
Clogged cylinder vent passage, exhaust port and/or carbon-clogged muffler Clogged air cleaner Chain brake set on Poorly adjusted carburetor ass’y
Starts, but …
Fluctuating revolutions at high speed
Chain oil is not discharged.
Cleaning Release Adjustment, cleaning or replacement
Dirt-clogged high-speed fuel line
Cleaning
Defective sealing of the packing
Clogged air cleaner
Replacement Adjustment, cleaning or replacement Cleaning
Poorly adjusted carburetor ass’y
Adjustment
Insufficient amount of chain oil in the oil tank Clogged chain oil discharge port Clogged oil filler port on the guide bar Clogged oil filter Poor adjustment of chain oil discharge amount Faulty oil pump
Insufficient chain oil in the oil tank
Faulty carburetor ass’y Excessive fuel consumption
Corrective action
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Cleaning
Poorly adjusted chain oil discharge amount Faulty oil pump
REPAIR GUIDE This section describes repair, focusing on portions requiring frequent repair. See TROUBLESHOOTING GUIDE in the previous section as the context for the following descriptions.
1. Precautions on maintenance, inspection and repair • The fuel used readily ignites; therefore, never bring the product near a flame. • Use new gaskets at reassembly. • Prior to disassembly for repair, remove the fuel and chain oil into separate containers, and allow the engine to cool down. • During repair, startup or running, use adequate care for portions posing the risk of burn injury or electric shock, such as hot areas including the muffler, high voltage cord, and spark plug. • Before running the product with the guide bar and saw chain attached, make sure that there are no other people nearby. • Ensure proper ventilation when performing repair in a small room or other poorly ventilated space.
2. Inspection criteria for each section and consumable parts Model Item
CS 51EAP
3,000 ± 200 min-1 (rev./min.)
Idling revolutions No-load maximum revolutions (with guide bar and saw chain)
13,500 min-1 (rev./min.) 3,900 to 4,600 min-1 (rev./min.)
Clutch engagement Accelerating performance
Smooth acceleration
Gap between magneto rotor and ignition coil ass’y
0.2 to 0.4 mm
Spark plug
NGK BPM7A or NGK BPMR7A
Gap between spark plug electrodes
0.6 to 0.7 mm
Saw chain type Saw chain pitch x gauge
CS 51EA
OREGON 95VPX, 20BPX 8.26 mm (0.325 in.) x 1.27 mm (0.05 in.)
No. of saw chain drive links
56, 64, 66, 72, 78
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Repair flowchart Pull the starter handle. Is pulling possible? Impossible to pull
OK
There is compression.
No compression OK
Seized or broken piston ring Seized piston or cylinder Seized or broken needle bearing of the crank shaft Seized ball bearing Magneto rotor contact with ignition coil Broken recoil starter Faulty starter pawl
Replacement Replacement
Faulty piston ring Worn piston ring Worn piston Worn or damaged oil seal Worn cylinder Defective sealing of the packing Defective decompression valve
Cleaning/replacement Replacement Replacement Replacement Replacement Replacement Replacement
Remove foreign matter.
Disassembly/cleaning
Replacement Replacement Adjustment Inspection/replacement Inspection/replacement
Is the spark plug contaminated with foreign matter? Contaminated OK Remove the spark plug to check for sparks. Sparks are generated.
No spark
OK
Return the spark plug and plug cap to the original positions, and then perform proper startup operation. Confirm that the tip of the spark plug becomes wet with fuel. Dry OK
Stop switch not at startup position Dirty or faulty spark plug Improperly connected plug cap Disconnected or improperly connected high voltage cord and other wiring Ground connection of high voltage cord and other wiring Disconnected or faulty ignition coil Excessive gap between magneto rotor circumference and ignition coil
No fuel in fuel tank or improper mixing ratio Clogged fuel filter Bent fuel pipe Cracked fuel pipe Fallen fuel pipe Faulty tank vent hole (inner cap) Faulty pump diaphragm of carburetor ass’y Dirt-clogged carburetor ass’y Poorly adjusted carburetor ass’y
Setting to startup position Cleaning/inspection Inspection/replacement Inspection/replacement Inspection Replacement Adjustment
Add properly mixed fuel (25:1 to 50:1). Cleaning/replacement Adjustment Replacement Connection Replacement Replacement Cleaning Adjustment
Wet spark plug due to excessive supply of fuel Wet OK
Starter handle pulled repeatedly with choke Dry the spark plug. button pulled out (set at “startup”) Remove excessive fuel.
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Starts up, and when idling mode is set… The engine stalls
OK When the product is tilted during idling… The engine stalls OK The saw chain starts rotating during idling. Starts rotating OK The engine starts, but when the throttle lever is pulled… The engine stalls
Dirty or faulty spark plug Defective air gap Worn piston ring Expired oil seal service life Defective decompression valve Revolutions too low for idling Poorly adjusted carburetor ass’y
Cleaning/replacement Adjustment Replacement Replacement Cleaning/replacement Adjustment Adjustment
Revolutions too low for idling Poorly adjusted carburetor ass’y Defective sealing of the packing
Adjustment Adjustment Replacement
Revolutions too high for idling Worn or faulty clutch Poorly adjusted carburetor ass’y
Adjustment Inspection/replacement Adjustment
Clogged fuel filter Inadequate warm-up, especially in cold weather Poorly adjusted carburetor ass’y
Cleaning/replacement
OK Clogged cylinder vent passage, exhaust port or carbon-clogged muffler Clogged air cleaner High speed unavailable Chain brake set on Poorly adjusted carburetor ass’y Faulty carburetor ass’y pump diaphragm Dirt-clogged carburetor ass’y OK
Pulling the throttle lever increases the speed.
When the revolutions increase… Revolutions fluctuate OK
Warm-up Adjustment
Cleaning Cleaning Release Adjustment Replacement Cleaning
Dirt-clogged high-speed fuel line of the carburetor ass’y Air intake from the packing section Faulty carburetor ass’y pump diaphragm Poorly adjusted carburetor ass’y
Inspection Replacement Adjustment
Revolutions too low for idling Poorly adjusted carburetor ass’y
Adjustment Adjustment
Clogged air cleaner Poorly adjusted carburetor ass’y
Cleaning Adjustment
Insufficient chain oil in the oil tank Clogged chain oil discharge port Clogged guide bar oil feed port Clogged oil filter Poorly adjusted chain oil discharge amount Defective oil pump
Supply oil. Cleaning Cleaning Cleaning Adjustment Replacement
Cleaning
When the speed rapidly decelerates from high speed… The engine stalls OK Is fuel consumption excessive? Excessive OK Is chain oil discharged?
No discharge
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Inspection and repair procedures [Bold] numbers in the descriptions below correspond to item numbers in the Parts List and exploded assembly diagram for the Models CS 51EAP and CS 51EA. Always stop the engine prior to disassembly or when replacing the saw chain.
1. Checking the spark of the spark plug CAUTION: Ɣ Be careful not to touch the metallic portion of the Spark Plug
Ɣ Spark plug
[46] when pulling the starter handle; otherwise, you run the risk of electric shock. Ɣ Carefully wipe off any fuel around the plug to avoid a sudden flash of fire. (1) Remove the Spark Plug [46] from the Cylinder [73]. Use a wire brush to clean off carbon deposits on the Spark Plug [46] electrodes, as needed. Adjust the gap between the electrodes if necessary. Use a cloth to wipe off any fuel on the electrodes. Remove fuel left in the Engine Case (A) Ass’y [87] and Engine Case (B) Ass’y [80] by following the procedure below. (a) With the Spark Plug [46] removed from the Cylinder [73]: (b) Open the Choke Button [93] (by pushing it in), and then set the Stop Switch [95] to the stop position. (c) Open the throttle (by pulling the Throttle Lever [149]). (d) Pull the starter handle several times.
Gap between electrodes (0.6 to 0.7 mm)
Remove carbon here.
Ɣ Checking for sparks High voltage cord
Plug cap Spark Plug [46]
(2) Insert the Spark Plug [46] into the Plug Cap [162], and then place the electrodes in contact with the metallic portion of the engine. Under these conditions, set the Stop Switch [95] to the startup position and pull the starter handle. (3) When all the above are normal, the Spark Plug [46] electrodes make a snapping sound to generate sparks.
Ignited sparks
Metallic portion of the engine
2. Adjustment of the carburetor (1) Use the Idle Adjust Screw [63] to adjust the carburetor. Ɣ Idle Adjust Screw [63] Use this screw to adjust revolutions at idling. Turning the screw clockwise increases engine revolutions; turning it counterclockwise decreases engine revolutions. (2) Standard setting of the carburetor Ɣ 3,000 ± 200 min-1 (rev./min) (3) Fine adjustment Ɣ Idling adjustment
Ɣ Idle adjust screw
Idle Adjust Screw [63]
Revolutions decrease.
Revolutions increase.
(a) Use the Idle Adjust Screw [63] to set revolutions so that the Saw Chain [115] does not start rotating while the engine runs stably. (b) Set idling revolutions to 2,800 to 3,200 min-1 (rev./min) by using the Idle Adjust Screw [63]. (Adjust to approx. 3,000 min-1 (rev./min).) Adjust the idling revolutions after the engine is fully warmed up. (Tip on warm-up: Let the engine idle for one minute with the engine in half-throttled status.)
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Disassembly and reassembly 1. Disassembly and reassembly of the cleaner and carburetor [Tools required] Ɣ Phillips screwdriver Ɣ Hex. bar wrench (4mm) (1) Disassembly Ɣ Loosen the Cleaner Knob [6] and remove the Cleaner Cover [2]. Ɣ Use a Phillips screwdriver to loosen the three Cover Set Bolts [4], and then remove the Cylinder Cover [5]. Ɣ Pull out Cleaner Element (A) [9] and Cleaner Element (B) [8]. Ɣ Remove the Clip [31] and pull out the Fuel Pipes [68] [51] [72] from the Carburetor Ass’y [52]. Use a hex. bar wrench (4 mm) to remove the Hex. Socket Hd. Bolt M5 x 12 (Precote) [38] and two Hex. Socket Hd. Bolts M5 x 45 [70]. Then remove the Cleaner Support [71] and Carburetor Ass’y [52]. (2) Reassembly Reassembly can be conducted by reversing the disassembly procedure. However, special attention should be given to the following items. Ɣ Do not bend the Fuel Pipes [68][51][72]. (See “2. Connecting the fuel pipes” for details.) Ɣ Apply 0.1 to 0.2 gram of Alvania Grease RL3 to the sliding portion of the Choke Rod Rubber [92] for the Choke Button [93]. Pull out the Choke Button [93] and then turn the throttle of the carburetor. Make sure that the Choke Button [93] returns automatically and the carburetor’s choke valve opens to its initial position. Ɣ Apply 0.1 to 0.2 gram of Alvania Grease RL3 to the lug portions (to be fitted in the grooves of the Engine Case (A) Ass’y [87] and Engine Case (B) Ass’y [80])) of the Operation Plate [94]. Ɣ Be careful not to get Cord (A) [163] and Cord (B) [164] caught in the Cylinder Cover [5]. Ɣ Cleaner and carburetor
Cleaner Knob [6] Knob Packing [7]
Cleaner Cover [2]
Shutter Plate [3]
Cleaner Element (B) [8] Choke Button [93]
Cover Set Bolt [4] Cleaner Element (A) [9]
Cylinder Cover [5] Choke Rod Rubber [92]
Hex. Socket Hd. Bolt M5 x 12 (Precote) [38]
Operation Plate [94]
Washer 5 [69]
Hex. Socket Hd. Bolt M5 x 45 [70] Washer 5 [69] Cleaner Support [71]
Fuel Pipe (FKM) [51]
Fuel Pipe [68] Clip [31] Carburetor Ass’y [52] Carburetor Insulator (C51) [50] Fuel Pipe [72]
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2. Connecting the fuel pipes Make the connections as shown in the illustration below. (1) Fully insert the pipes down to their roots. (2) Do not bend or twist the pipes. (3) Be careful not to get pipes in the respective portions caught in other parts. (4) The end faces of the Fuel Pipe 2.5 x 4 x 90 [43] and Fuel Pipe [68] should protrude from the edge of the Fuel Grommet [152] by 55 to 60 mm and 167 to 172 mm, respectively. CAUTION: Never mix up fuel pipes inserted into the Priming Pump Comp. [44].
Ɣ Fuel pipe connection chart
Fuel Pipe 2.5 x 4 x 90 [43]
Color: Black Clip [31]
Priming Pump Comp. [44]
7 mm or more Clip [31]
Color: Transparent 7 mm or more Cleaner Support [71]
Fuel Pipe (FKM) [51]
Fuel Grommet (A) [41] Grommet [42]
Carburetor Ass’y [52]
Fuel Pipe [72] CAUTION: Check the positional relation of the Fuel
Fuel Pipe [68]
Pipes [68] and [72].
Fuel Grommet [152]
Fuel Pipe 2.5 x 4 x 90 [43]
Fuel Pipe [68]
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3. Disassembly and reassembly of the recoil starter [Tool required] Ɣ Phillips screwdriver (1) Disassembly Ɣ Pull out the Plug Cap [162] from the Spark Plug [46]. Ɣ Use a Phillips screwdriver to loosen the four Cover Set Bolts [4], and then remove the Recoil Starter [176] and Air Deflector [175]. (2) Reassembly Reassembly can be conducted by reversing the disassembly procedure. However, special attention should be given to the following items. Ɣ Place Cord (A) [163] and Cord (B) [164] into the groove of the Air Deflector [175] for assembly. Ɣ Place the high voltage cord of the ignition coil into the groove of the Air Deflector [175] for assembly. Ɣ Apply 0.05 to 0.1 g of Chemiseal L-391 (manufactured by Chemitech Inc.) on the female threads of the Cover Set Bolt [4] before mounting the Recoil Starter [176]. Ɣ Assembling the Recoil Starter [176] is made easier by first pulling the starter handle, and then returning it a little.
Ɣ Recoil starter
Air Deflector [175]
Recoil Starter [176]
Cover Set Bolt [4] ၥၷှျၱၑၥ[162] High voltage cord Air Deflector [175]
Cord (A) [163]
Cord (B) [164]
CAUTION: Place Cord (A) [163] and Cord (B) [164] into the groove of the Air Deflector [175] for assembly. CAUTION: Move the excess cords here to take up the slack of Cord (A) [163] and Cord (B) [164].
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4. Disassembly and reassembly of the rear handle and engine case [Tools required] Ɣ Flat-blade screwdriver Ɣ Box end wrench 10 x 19 mm (1) Disassembly
Ɣ Assembling the antivibration structure of coil spring The Antivibration Springs [157] [14] should not protrude from this surface of the Spring Holders [155] [12].
Ɣ Remove the Fuel Pipe 2.5 x 4 x 90 [43] from the Priming Pump Comp. [44]. Ɣ Secure the Spring Holders [155] [12] by inserting a flat-blade screwdriver into the groove of the bolt, and then use a box end wrench 10 x 19 mm to remove Nut M6 [10]. Ɣ Remove the Damper [124], and then use a flat-blade screwdriver to remove the two Damper
Spring Holders [155] [12] 1 mm or less
Antivibration Springs [157] [14] Flanged Tapping Screw D6 [156]
Set Bolts [15]. Also remove the Rear Handle [146]. (2) Reassembly Reassembly can be conducted by reversing the disassembly procedure. However, special attention should be given to the following items.
Rear Handle [146]
Ɣ Tightening Nut M6 [10]
Ɣ Insert the Antivibration Springs [157] [14] so that their first coils do not protrude from the first coils of the Spring Holders [155] [12]. (See the illustration above.) Ɣ Apply 0.1 to 0.3 g of Chemiseal L-391 (manufactured by Chemitech Inc.) to the bolts of the Spring Holders [155] [12] or on the female threads of Nut M6 [10]. Ɣ Secure the Spring Holders [155] [12] by inserting a flat-blade screwdriver into the groove of the bolt as illustrated on the right, and then tighten Nut M6 [10] so that the Spring Holders [155] [12] do not rotate when you turn the screwdriver by using a box end wrench 10 x 19 mm.
Nut M6 [10]
Ɣ Use the box end wrench 10 x 19 mm to hold Nut M6 [10] in place, and then use a torque wrench with a flat bit to tighten the bolts of the Spring Holders [155] [12] at the specified torque of 5.5 ± 0.5 N•m (56 ± 5 kgf•cm). CAUTION: Do not twist the Fuel Pipe [68] between the rear handle and engine case. Ɣ Rear handle and engine case Engine case ass’y Damper [124] Damper Set Bolt [15]
Nut M6 [10]
Rear Damper [88]
Spring Holder [155]
Fuel Pipe [68] Rear handle ass’y
Antivibration Spring [157]
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5. Disassembly and reassembly of the clutch and oil pump [Tools required] Ɣ J-361 jig (No.6698723) (clutch puller) Ɣ Phillips screwdriver (1) Disassembly
Ɣ Removing the clutch
Ɣ Align the pawl of the J-361 jig (clutch puller) with the Clutch [131], and then use an impact driver to turn it in the arrow direction as
Clutch [131]
shown in the illustration on the right to remove the Clutch [131]. Remove Clutch Washer (B) [132], the Clutch Housing [133], Needle Bearing [134], Rim Sprocket [135], and Clutch Washer [136]. CAUTION: Note that the Clutch [131] is screwed into the Crank Shaft [83] with left-hand threads. Do not remove Spark Plug BPM-7A/BPMR7A [46] from the Cylinder [73]. Turn J-361 jig (clutch puller) off the Decomp. [45] (by pulling it toward you). Ɣ Remove the three Seal Lock Screws M4 x 10 and [16] Oil Pump Cover [137]. CAUTION: The threads of the Seal Lock Screws M4 x 10 [16] may be easily broken. Therefore, do not tighten the screws too much. Ɣ Remove the Machine Screw M4 x 16 [28] and Clip [31], and then remove the Oil Pipe [29] from the Oil Pump [30]. Finally, remove the Oil Pump [30] from the main body. (2) Reassembly Reassembly can be conducted by reversing the disassembly procedure. However, special attention should be given to the following items. Ɣ Before mounting the Worm [138], apply 0.1 to 0.3 gram of Alvania Grease RL3 to its inner diameter. Ɣ Before mounting the Oil Pump [30], apply 0.6 to 1.0 gram of Alvania RL3 on the gear portion of the Worm [138]. Ɣ Securely engage the Oil Pump [30] with the gears of the Worm [138]. Ɣ Place the Clutch Washer [136] on the protrusions of the Worm [138] for assembly. (See the illustration titled “Mounting the clutch washer” on the next page for details.) Ɣ Before mounting the Clutch [131], degrease the female threads of the Clutch [131] and the threads of the Crank Shaft [83]. Ɣ Use the Hitachi 14.4V impact driver to tighten the Clutch [131] for about one second, in order to obtain the specified torque. CAUTION: Ɣ Never tighten excessively. Otherwise, the flange of the Worm [138] may break and thus inhibit removal. Ɣ Run the assembled chain saw and make sure the Clutch [131] is firmly tightened. Clutch [131] Clutch Washer (B) [132]
Ɣ Clutch and oil pump
Clutch Housing [133]
Seal Lock Screws M4 x 10 [16]
Needle Bearing [134] Rim Sprocket [135] Clutch Washer [136] Oil Pump Cover [137] Air Vent Sponge [139] Worm [138] Air Vent Valve (B) [140] Machine Screw M4 x 16 [28] Oil Pipe [29] Clip [31] Oil Pump [30]
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Ɣ Mounting the clutch washer Clutch Housing [133]
Place the Clutch Washer [136] on the protrusion of the Worm [138] before assembly.
Clutch [131]
Needle Bearing [134]
Crank Shaft [83]
Clutch Washer [136] Worm [138] Clutch Washer (B) [132]
Worm [138] Protrusions
Rim Sprocket [135]
Clutch Washer [136]
6. Disassembly and reassembly of the magneto rotor [Tools required] Ɣ J-363 jig (No.6694822) (8 x 120 handle) Ɣ J-357 (No.6695737) (center bolt) Ɣ J-356 jig (No.6695736) (complete rotor extraction tool) Ɣ J-365 jig (No.6695739) (stepped bolt 5 mm) Ɣ Socket wrenches (10 mm and 13 mm) Ɣ M8 nut (1) Disassembly Ɣ Use a 10-mm socket wrench to remove the two Step Bolts [174]. Then remove the two Shims [173], two Starter Pawls [172], two Starter Pawl Springs [170], and two Washers 0.8 [171]. Ɣ Use a 13-mm socket wrench to remove Flange Nut M8 [112]. Ɣ With the screw end face of the Crank Shaft [83] made Ɣ Removing the magneto rotor flush with the upper face of a commercially available M8 nut, rotate the J-363 jig (8 x 120 handle) in the J-363 jig (8 x 120 handle) J-357 (center bolt) arrow direction and tighten the J-357 jig (center bolt) as shown in the illustration on the right. Then remove the Magneto Rotor [169]. (2) Reassembly Reassembly can be conducted by reversing the disassembly procedure. However, special attention should be given to the following items. Ɣ Before mounting the Magneto Rotor [169], degrease the tapered section of the Magneto Rotor [169], as well as the threads and tapered section of the Crank
J-356 jig (complete rotor extraction tool)
J-365 jig (stepped bolt 5 mm)
Shaft [83]. Ɣ When removing the Magneto Rotor [169] or Ignition Coil [166], adjust the clearance between the Magneto Rotor [169] and Ignition Coil [166] as per “7. Adjustment of clearance between the magneto rotor and ignition coil.” Ɣ After reassembly, check the operation of the Starter Pawl [172].
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Magneto Rotor [169]
Ɣ Magneto rotor
Magneto Rotor [169] Starter Pawl Spring [170] Washer 0.8 [171] Starter Pawl [172] Shim [173] Step Bolt [174] Crank Shaft [83] Flange Nut M8 [112]
7. Adjustment of clearance between the magneto rotor and ignition coil (1) Loosen the Hex. Socket Hd. Bolt (W/Flange) M4 x 18 [167] so as to temporarily secure the Ignition Coil [166]. (2) Insert a 0.3-mm thickness gauge between the Ignition Coil [166] and the perimeter of the Magneto Rotor [169]. (3) Under this condition, firmly tighten the Hex. Socket Hd. Bolt (W/Flange) M4 x 18 [167].
Ɣ Adjustment of clearance between the magneto rotor and ignition coil
Ignition Coil [166]
Hex. Socket Hd. Bolt (W/Flange) M4 x 18 [167]
0.2 to 0.4 mm 0.2 to 0.4 mm
Magneto Rotor [169]
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8. Wiring diagram The following diagram shows the wiring. (1) Connect the connector (silver) of Cord (A) [163] to the Ignition Coil [166]. (2) Fix Cord (B) [164] to the Ignition Coil [166] with the Hex. Socket Hd. Bolt (W/Flange) M4 x 18 [167]. (3) Fit the Stop Switch [95] into the Operation Plate [94] so that indication “1” faces up. (4) Connect the connectors (brass color) of Cord (A) [163] and Cord (B) [164] to the connectors of the Stop Switch [95]. (5) Bundle together Cord (A) [163] and Cord (B) [164], and then secure the concave portion of the bundle with the Cable Tie [161]. CAUTION: Do not get Cord (A) [163] and Cord (B) [164] caught in other parts.
• Wiring diagram Cord (A)[163]
Connector (Brass color)
Plug Cap [162] Spark Plug BPM-7A/BPMR7A [46] Connector (Silver)
Stop Switch [95] Operation Plate [94]
Cord (B) [164]
Cable Tie [161]
Hex. Socket Hd. Bolt (W/Flange) M4 x 18 [167]
Ignition Coil [166]
• Cable tie securing position
Concave portion of Cord (A) [163] and Cord (B) [164]
Cord (B) [164]
Cable Tie [161]
Cord (A)[163]
Cord (B) [164] Cord (A)[163] Cable Tie [161] Cut off the surplus end of the Cable Tie [161] with 2 to 5 mm of strap projecting from its locking head.
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9. Disassembly and reassembly of the muffler [Tools required] Ɣ Hex. bar wrenches (3 mm, 4 mm and 5 mm) Ɣ Flat-blade screwdriver (1) Disassembly Ɣ Use a flat-blade screwdriver to remove the two Muffler Caps [36]. Use a 5-mm hex. bar wrench to remove the two Seal Lock Hex. Socket Hd. Bolts M6 x 20 [37]. Use a 4-mm hex. bar wrench to remove the two Hex. Socket Hd. Bolts M5 x 12 (Precote) [38]. Then remove the Muffler [39]. Ɣ Use a 3-mm hex. bar wrench to remove the five Hex. Socket Hd. Bolts M4 x 10 [24] and five Bolt Washers M4 [25]. Then remove the Muffler Protector [26], Muffler Protector Gauze [27], Exhaust Pipe [19], and Muffler Gauze [20]. (2) Reassembly Reassembly can be conducted by reversing the disassembly procedure. However, special attention should be given to the following items. Ɣ Do not reuse the Seal Lock Hex. Socket Hd. Bolts M6 x 20 [37], Hex. Socket Hd. Bolts M5 x 12 (Precote) [38], and Muffler Caps [36]. Ɣ Before mounting the Muffler [39], degrease the screw holes of the Cylinder [73], Engine Case (A) Ass’y [87], and Engine Case (B) Ass’y [80]. Ɣ Mount the Muffler [39] by temporarily securing the two Seal Lock Hex. Socket Hd. Bolts M6 x 20 [37] and the two Hex. Socket Hd. Bolts M5 x 12 (Precote) [38], and then firmly tighten all four bolts. • Muffler Bolt Washers M4 [25] Exhaust Pipe [19] Hex. Socket Hd. Bolts M4 x 10 [24]
Muffler Gauze [20]
Muffler Packing [40]
Muffler [39]
Hex. Socket Hd. Bolt M5 x 12 (Precote) [38] Muffler Protector [26] Muffler Protector Gauze [27]
Seal Lock Hex. Socket Hd. Bolt M6 x 20 [37] Muffler Cap [36]
-15-
10. Disassembly and reassembly of the cylinder and scavenging cover [Tools required] Ɣ Hex. bar wrenches (4 mm and 5 mm) Ɣ Phillips screwdriver Ɣ Socket wrenches (13 mm and 19 mm) (1) Disassembly Ɣ Use a 19-mm socket wrench to remove Spark Plug BPM-7A/BPMR7A [46]. Ɣ Use a 5-mm hex. bar wrench to remove the four Seal Lock Hex. Socket Hd. Bolts M6 x 20 [37]. Then remove the Cylinder [73]. Ɣ Use a Phillips screwdriver to remove the eight Seal Lock Screws M4 x 10 [16]. Then remove Scavenging Cover (A) [74] and Scavenging Cover (B) [17]. CAUTION: The threads of the Seal Lock Screws M4 x 10 [16] may be easily broken. Therefore, do not tighten the screws too much. Ɣ Use a 13-mm socket wrench to remove the Decomp. [45]. (2) Reassembly Reassembly can be conducted by reversing the disassembly procedure. However, special attention should be given to the following items. Ɣ Do not reuse the Cylinder Packing (C51) [75], Cover Packing [18], and Intake Packing (C51) [47]. Ɣ Do not reuse the Seal Lock Screws M4 x 10 [16], Seal Lock Hex. Socket Hd. Bolts M6 x 20 [37], and Hex. Socket Hd. Bolts M5 x 12 (Precote) [38]. Ɣ Before mounting the Cylinder [73], degrease the screw holes of the Engine Case (A) Ass’y [87] and Engine Case (B) Ass’y [80]. Ɣ Before mounting Scavenging Cover (A) [74] and Scavenging Cover (B) [17], degrease the screw holes of the Cylinder [73]. Ɣ Before mounting the Intake (CS51) [48], degrease the screw holes of the Cylinder [73]. Ɣ Reassemble the packings by ensuring the proper alignment of the holes. Ɣ Pay attention to the directional property of the Cylinder Packing (C51) [75]. (At reassembly, match it with the shape of the vent port.) Ɣ Pay attention to the directional property of the Cover Packing (C51) [18]. (Assemble so that the lower part of the Cover Packing (C51) [18] protrudes between Scavenging Cover (A) [74] and Scavenging Cover (B) [17].) Ɣ When removing the Cylinder [73], remove all carbon deposits on the exhaust port and combustion chamber by being careful not to scratch the cylindrical surface, and then carefully clean these parts by using gasoline. Ɣ Prevent the entry of foreign matter through the respective ports of the Cylinder [73] at reassembly. Ɣ Before mounting the Cylinder [73], lightly apply 2-cycle oil to the cylindrical surface of the Cylinder [73] and the periphery of the Piston (44) (M) [77]. Ɣ Fit the lip portion of the Intake (CS51) [48] into the groove of the Carburetor Insulator (C51) [50] when mounting the Intake (CS51) [48] to the Carburetor Insulator (C51) [50].
-16-
• Cylinder and scavenging cover
Carburetor Insulator (C51) [50] Cab. Insulator Rubber [49]
Spark Plug BPM-7A/BPMR7A [46] Hex. Socket Hd. Bolt M5 x 12 (Precote) [38]
Seal Lock Screw M4 x 10 [16] Decomp. [45]
Lip portion
Intake (CS51) [48] Intake Packing (C51) [47]
Scavenging Cover (B) [17]
Seal Lock Hex. Socket Hd. Bolt M6 x 20 [37]
Cover Packing (C51) [18]
Cover Packing (C51) [18]
Cylinder [73]
Scavenging Cover (A) [74] Seal Lock Screw M4 x 10 [16] Cylinder Packing (C51) [75]
11. Disassembly and reassembly of the piston and piston ring [Tools required] Ɣ Long-nose pliers Ɣ J-359 jig (No.6695741) (piston pin extraction tool ass’y) Ɣ Hex. socket hd. bolt M5 x 12 Ɣ Round bar 9.8 mm in diameter (e.g., borer 10 mm in diameter) (1) Disassembly Ɣ Remove the two Circlips [78] with long-nose pliers. Ɣ Insert a hex. socket hd. bolt M5 x 12 into the
• Removing the piston
pushing side of the Piston Pin [85], and then turn the pin pullout bolt of the J-359 jig (piston pin extraction tool ass’y) clockwise to pull out the Piston Pin [85]. CAUTION: Do not scratch the Piston (44) (M) [77]. (2) Reassembly Ɣ Do not reuse the Circlips [78]. Ɣ When removing the Piston (44) (M) [77], remove carbon deposits on top of the Piston (44) (M) [77] by being careful not to scratch the piston surface,
J-359 jig (piston pin extraction tool ass’y) Hex. socket hd. bolt M5 x 12
Pin pullout bolt
and then carefully clean the Piston (44) (M) [77] by using gasoline. Ɣ If the Piston Ring [76] does not move smoothly, remove carbon deposits on the ring groove of the Piston (44) (M) [77] and Piston Ring [76], and then carefully clean these parts by using gasoline.
-17-
Ɣ Insert the Piston Pin [85] by following the procedure below. (See “Mounting the piston.”) (1) Insert the Piston Pin [85] into the Piston (44) (M) [77] by about 7 mm. CAUTION: Be sure to support the flat portion (casting surface) of the Piston (44) (M) [77] when using a hand press. Do not tilt the Piston Pin [85]. (2) Set the J-359 jig (piston pin extraction tool ass’y) to the Piston (44) (M) [77], and then set a hex. socket hd. bolt M5 x 12 into the pushing side of the Piston Pin [85]. (3) Set Needle Bearing (A) [86] and the two Piston Pin Collars (C51) [79] to the connecting rod small end, and then cover it with the Piston (44) (M) [77]. (Align the triangular arrow on top of the Piston (44) (M) [77] with the direction of the exhaust port of the Cylinder [73].) Insert a round bar about 9.8 mm in diameter (e.g., borer 10 mm in diameter) into the Piston (44) (M) [77] opposite the side where the Piston Pin [85] is inserted, in order to prevent Needle Bearing (A) [86] and the two Piston Pin Collars (C51) [79] from becoming misaligned. CAUTION: Mount the Piston Pin Collar (C51) [79] with its concave portion facing Needle Bearing (A) [86]. (4) With the round bar 9.8 mm in diameter inserted, turn the pin pullout bolt of the J-359 jig (piston pin extraction tool ass’y) clockwise, and then push in the Piston Pin [85] just before the circlip mounting groove of the Piston (44) (M) [77]. CAUTION: Do not get the Piston Pin Collars (C51) [79] caught in other parts. Ɣ Use long-nose pliers to fit the tip of the Circlip [78] (2 pcs.) into the groove of the Piston (44) (M) [77], and then turn it until the Circlip [78] is completely mounted. Ɣ Align the opening of the Piston Ring [76] (2 pcs.) with the knock pin of the Piston (44) (M) [77]. Ɣ After mounting the Piston (44) (M) [77], lightly apply 2-cycle oil to Needle Bearing (A) [86]. Ɣ Mounting the piston
Piston (44) (M) [77]
Round bar 9.8 mm in diameter (e.g., borer 10 mm in diameter)
Connecting rod small end Hex. socket hd. bolt M5 x 12
Circlip mounting groove Piston Pin Collar (C51) [79]
Pin pullout bolt
Piston Pin [85] Needle Bearing (A) [86]
Ɣ Piston and piston ring Piston Ring [76] Piston (44) (M) [77] Piston Pin [85]
Circlip [78] Connecting rod small end Needle Bearing (A) [86] Piston Pin Collar (C51) [79]
-18-
12. Disassembly and reassembly of the engine case [Tools required] Ɣ Hex. bar wrench (5 mm) Ɣ Phillips screwdriver Ɣ Long-nose pliers (1) Disassembly Ɣ Use long-nose pliers to pull out the Rear Damper (C51) [88]. Ɣ Use a Phillips screwdriver to remove the two Seal Lock Screws M5 x 12 [33], and then remove the Spike [34]. CAUTION: The threads of the Seal Lock Screws M5 x 12 [33] may be easily broken. Therefore, do not tighten the screws too much. Ɣ Use a 5-mm hex. bar wrench to remove the four Seal Lock Hex. Socket Hd. Bolts M5 [32] and two Seal Lock Hex. Socket Hd. Bolts M5 x 45 [35]. Then remove the Engine Case (A) Ass’y [87], Engine Case (B) Ass’y [80], and Crank Shaft [83]. Ɣ Remove Ball Bearing 6202C3 [82] and the Oil Seal [81] by pushing it out on the Oil Seal [81] side. (2) Reassembly Reassembly can be conducted by reversing the disassembly procedure. However, special attention should be given to the following items. Ɣ Do not reuse the Oil Seal [81] and Ball Bearing 6202C3 [82] removed from the Engine Case (A) Ass’y [87] and Engine Case (B) Ass’y [80]. Ɣ Do not reuse the Crank Case Packing (C51) [84]. Ɣ Do not reuse the Seal Lock Hex. Socket Hd. Bolts M5 [32] and Seal Lock Hex. Socket Hd. Bolts M5 x 45 [35]. Ɣ Apply 50 to 100 mg of Piloknock Universal No. 0 of JX Nippon Oil & Energy between the lips of the Oil Seal [81]. Ɣ Carefully clean the Crank Shaft [83] by using gasoline before mounting. Ɣ Degrease the screw holes of the Engine Case (A) Ass’y [87] and Engine Case (B) Ass’y [80] before mounting. Do not get the Fuel Pipe [119] caught between the Engine Case (A) Ass’y [87] and Engine Case (B) Ass’y [80] when mounting. Ɣ Check the hole position of the Crank Case Packing (C51) [84] and mount it without misalignment. (When mating the Engine Case (A) Ass’y [87] and Engine Case (B) Ass’y [80], confirm that the Crank Case Packing (C51) [84] is properly mounted along the circumference of the engine case.) Ɣ Cut off the protrusion of the Crank Case Packing (C51) [84] at the mating surface of the Cylinder [73] after mounting. CAUTION: Do not break the Crank Case Packing (C51) [84] when cutting it. Engine Case (B) Ass’y [80]
Ɣ Engine case Seal Lock Hex. Socket Hd. Bolt M5 x 45 [35] Seal Lock Hex. Socket Hd. Bolt M5 [32]
Rear Damper (C51) [88]
Seal Lock Screw M5 x 12 [33]
Spike [34]
Oil Seal [81] Ball Bearing 6202C3 [82] Crank Shaft [83] Crank Case Packing (C51) [84] Engine Case (A) Ass’y [87]
-19-
13. Disassembly and reassembly of the side case [Tool required] Ɣ Phillips screwdriver (1) Disassembly Ɣ Remove Flange Nut M8 [112] and remove the side case from the main body. Ɣ With the Brake Link [126] being held in a vise, push it down to apply the brake. Ɣ Use a Phillips screwdriver to remove the six Seal Lock Screws M4 x 10 [16]. Then remove the components of the side case, such as Brake Band [128]. CAUTION: The threads of the Seal Lock Screws M4 x 10 [16] may be easily broken. Therefore, do not tighten the screws too much. (2) Reassembly Reassembly can be conducted by reversing the disassembly procedure. However, special attention should be given to the following items. Ɣ Do not reuse the Seal Lock Screws M4 x 10 [16]. Ɣ Align Guide Plate (B) [116] with the groove of the Brake Link Cover [130] when mounting. Ɣ After mounting, use a vise to hold the Brake Link
Ɣ Operation check of the chain brake
[126], and then push it up until you hear a click to release the brake. Ɣ Operate the Chain Puller Bolt [114] and confirm that the chain puller boss moves. Ɣ After reassembly, operate the Brake Handle [89] to confirm chain brake activation. The chain brake must operate at F = 20 N to 60 N (2.04 kgf to 6.12 kgf). (See the drawing on the right.) Upon ensuring activation, release the chain brake.
Loading position
Brake Handle [89]
Loading direction
40 to 50°
Ɣ Side case Brake Link [126] Side Case Sub [113] Brake Spring [127] Brake Band [128] Needle Roller D3 [129]
Brake Link Cover [130] Chain puller boss
Chain Puller Bolt [114] Seal Lock Screw M4 x 10 [16] Guide Plate (B) [116]
-20-
Tightening torque Unit: N•m {kgf•cm} Location Recoil starter Electrical system
Carburetor
Quantity 4
Cover Set Bolt [4]
Ignition Coil [166]
2
Hex. Socket Hd. Bolt (W/Flange) M4 x 18 3.0 to 4.0 {31 to 41} [167]
Spark Plug BPM-7A/BPMR7A [46]
1
Spark Plug BPM-7A/BPMR7A [46]
10 to 15 {102 to 153}
Carburetor Ass’y [52]
1 1 4
Screw [53] Hinge Pin Set Screw [64] Set Screw [67]
1.8 to 2.2 {18 to 23} 0.7 to 0.8 {7 to 9} 0.7 to 0.8 {7 to 9}
2
Hex. Socket Hd. Bolt M5 x 45 [70]
2.2 to 2.8 {23 to 29}
Hex. Socket Hd. Bolt M5 x 12 (Precote) [38]
2.2 to 2.8 {23 to 29}
Carburetor Ass’y [52] Carburetor Insulator (C51) [50] Cleaner Support (C51) [71]
1 1 each
Antivibration Spring [14]
1
Spring Holders [155][12]
1 each
Rear handle
2 Front Handle [22] 2
Magneto rotor
Rear Handle [146]
2
Rear Handle Grip [142]
1
Clutch [131] Oil Pump Cover (C51) [137] Guide Plate (A) [123] Oil Pump [30] Magneto Rotor [169]
1
Starter Pawl [172] Cylinder [73] Scavenging Cover (A) [74] Scavenging Cover (B) [17]
Engine
Side case
Other
Tightening torque
Recoil Starter [176]
Antivibration Spring [157]
Clutch, oil pump
Part name
3 1 1 1 1 each 4 4 each
2.7 to 3.2 {28 to 33}
Flanged Tapping Screw D6 [156]
3.5 to 4.5 {35 to 45}
Hex. Socket Hd. Bolt (W/Flange) M6 x 20 [13]
6.0 to 9.0 {61 to 92}
Nut M6 [10]
5.0 to 6.0 {51 to 61}
Tapping Screw (W/Flange) D5 x 25 (Black) 2.4 to 3.4 {25 to 35} [21] Tapping Screw (W/Flange) D5 x 20 (Black) 2.4 to 3.4 {25 to 35} [23] Damper Set Bolt [15] 2.4 to 3.4 {25 to 35} Tapping Screw (W/Flange) D4 x 16 (Black) 1.5 to 2.5 {15 to 25} [141] Clutch [131] 35 to 40 {357 to 408} Seal Lock Screw M4 x 10 [16]
1.4 to 2.2 {14 to 22}
Machine Screw M4 x 16 [28] Flange Nut M8 [112]
1.4 to 2.2 {14 to 22} 20 to 22 {204 to 224}
Step Bolt [174]
5.9 to 6.9 {60 to 70}
Seal Lock Hex. Socket Hd. Bolt M6 x 20 [37]
9.0 to 10.0 {91 to 101}
Seal Lock Screw M4 x 10 [16]
3.0 to 4.0 {31 to 41} 3.0 to 4.0 {31 to 41}
Intake (CS51) [48]
2
Hex. Socket Hd. Bolt M5 x 12 (Precote) [38]
Decomp. [45]
1 2 2
Decomp. [45] 17 to 27 {175 to 275} Seal Lock Hex. Socket Hd. Bolt M6 x 20 [37] 11.3 to 12.3 {115 to 125} Hex. Socket Hd. Bolt M5 x 12 (Precote) [38] 5.4 to 6.4 {55 to 65}
Muffler (C51) [39] Muffler Protector [26] Exhaust Pipe (C51) [19] Engine Case (A) Ass’y [87] Engine Case (B) Ass’y [80] Brake Link Cover [130] Guide Plate (B) [116] Cylinder Cover (C51) [5] Brake Handle [89]
3 2 2 4 4 2 3 2
Chain Catcher [125] Spike [34] Chain Bar [117]
1 2 2
Hex. Socket Hd. Bolt M4 x 10 [24]
3.5 to 4.5 {35 to 45}
Seal Lock Hex. Socket Hd. Bolt M5 x 45 [35] Seal Lock Hex. Socket Hd. Bolt M5 [32]
5.0 to 6.0 {51 to 61}
Seal Lock Screw M4 x 10 [16]
1.4 to 2.2 {14 to 22}
Cover Set Bolt [4] Machine Screw M4 x 16 [28]
2.7 to 3.2 {28 to 33} 1.8 to 2.2 {18 to 22}
Seal Lock Screw M5 x 12 [33]
3.0 to 4.0 {31 to 41}
Flange Nut M8 [112]
15 to 20 {154 to 204}
-21-
Confirmation after reassembly 1. Check the following before starting the engine. ż Confirm that the crank shaft rotates and there is compression when pulling the starter handle. ż Turn on (push) the decompression valve and confirm that the starter handle can be pulled lightly. ż Perform priming ten times and then confirm that the priming pump is full of fuel. ż Activate the chain brake and confirm that the saw chain is locked. ż Pull the throttle lever while pulling the choke button, and then confirm that the choke button returns automatically.
2. Check the following after starting the engine. ż Confirm that the engine starts up by following the procedure below. (1) Set the stop switch to the startup position. (2) Activate the chain brake. (3) Perform priming ten times. (4) Keep pulling the choke button. (5) Turn on (push) the decompression valve. (6) Pull the starter handle and check for initial ignition. (As a guide, 3 to 5 times at ambient temperature (20°C). * Increase the number of pulling times at low temperature.) (7) Push in the choke button. (This will automatically lock half-throttle status.) (8) Turn on (push) the decompression valve. (Note that the decompression valve returns automatically to the OFF position under combustion pressure.) (9) Pull the starter handle to start the engine. (Tip: 2 or 3 times at ordinary temperature (20°C) * Pull the handle more under low ambient temperature.) (10) Lightly pull the throttle lever and confirm that half-throttle status is canceled and the engine returns to idling. (Do not run the engine in half-throttled status with the chain brake on.) (11) Release the chain brake. ż Make sure that the respective moving and rotating parts work smoothly without any abnormal noise. ż Adjust the carburetor. (See "2. Adjustment of the carburetor" under the "Inspection and repair procedures.") ż Make sure that the saw chain does not run while the engine is idling. ż Operate the throttle lever without gripping the trigger lockout, and make sure that engine revolutions do not increase. ż Check both idling engine speed and full engine speed without a load (with the saw chain mounted). ż Make sure that the engine accelerates smoothly. ż Release the throttle lever and make sure that the engine idles. ż Let the engine idle, and then rapidly accelerate and decelerate the engine. Make sure that the engine does not stop. ż Make sure that chain oil is supplied normally to the saw chain. ż Reset the stop switch to the stop position and make sure that the engine stops.
-22-
LIST NO. F009
ENGINE ENGINE CHAIN SAW Model CS 51EAP
2012 · 2 · 2 (E2)
1
6 7
2
3 4 38
5 8
53
63
9
69
68
62 31
10 54
11
70
51 69
55
31
C
52
56
12 13
71
50 49
14
38
21
64
48
A
47
46 15
65 57
45
66
B
58
22 59 72
16
23
18
37
20
25
60
73
17 19
24
61
67
24 25 18
26 40
89 16
27 39 28
29
30
90
74 28 69
42
75
44
38 43
37
41
36
76
35
69
31
28
77 32
93
91
78
92
79
33
85
34
95
78 94
86 79
81 80
88
82 87
82
83
81
84
A
CS 51EAP
126 111
501
502
127 128
112
129 130
113
131 132
116
133
16
134 117
114
135 136
16
115
16 137 138
141 118 119
142 31
139
148
120 121 16
140
143 122
149 144
150
123
151
C
178
161
145
152 163
162
146
153 124
31
164
154
15
147
33 125 10 158
155
169
166 167
156
157
168
165
157
156
155
B
170 171
10
159 172 173 174
160
112
15 124
159
160 175 177 176
-2-
4
2 - 12
PARTS ITEM NO.
CS 51EAP
CODE NO.
DESCRIPTION
NO. USED
1
669-8919 START LABEL (C51) (EX)
1
2
669-8568 CLEANER COVER (C51)
1
3
669-8569 SHUTTER PLATE
1
4
669-6903 COVER SET BOLT
7
5
669-8708 CYLINDER COVER (C51)
1
*
6
669-8595 CLEANER KNOB (VERMILION)
1
*
6
669-8596 CLEANER KNOB (GREEN)
1
7
669-8570 KNOB PACKING
1
8
669-8563 CLEANER ELEMENT (B)
1
9
669-8562 CLEANER ELEMENT (A)
1
10
669-8449 NUT M6
3
11
949-432
1
12
669-8429 SPRING HOLDER
13
881-722
14
669-8428 ANTIVIBRATION SPRING
15
668-5413 DAMPER SET BOLT
3
16
669-6835 SEAL LOCK SCREW M4 X 10
18
17
669-8539 SCAVENGING COVER (B)
1
18
669-8540 COVER PACKING (C51)
2
19
669-8903 EXHAUST PIPE (C51)
1
20
669-8575 MUFFLER GAUZE (C51)
1
21
305-558
2
22
669-8578 FRONT HANDLE
1
23
302-089
TAPPING SCREW (W/FLANGE) D5 X 20 (BLACK)
2
24
949-812
HEX. SOCKET HD. BOLT M4 X 10 (10 PCS.)
5
25
949-429
BOLT WASHER M4 (10 PCS.)
5
26
669-8904 MUFFLER PROTECTOR
27
669-8905 MUFFLER PROTECTOR GAUZE
1
28
949-219
3
29
669-8900 OIL PIPE (CS40)
30
669-8554 OIL PUMP
1
31
668-5311 CLIP
5
32
668-5412 SEAL LOCK HEX. SOCKET HD. BOLT M5
4
33
669-8901 SEAL LOCK SCREW M5 X 12
3
34
668-5400 SPIKE
1
35
669-8902 SEAL LOCK HEX. SOCKET HD. BOLT M5 X 45
2
36
669-8706 MUFFLER CAP
2
37
669-8899 SEAL LOCK HEX. SOCKET HD. BOLT M6 X 20
6
38
669-6836 HEX. SOCKET HD. BOLT M5 X 12 (PRECOTE)
5
39
669-8573 MUFFLER (C51)
1
40
669-8576 MUFFLER PACKING (C51)
1
41
668-5308 FUEL GROMMET (A)
1
42
669-8787 GROMMET
1
43
668-5267 FUEL PIPE 2.5 X 4 X 90
1
44
668-5139 PRIMING PUMP COMP.
1
BOLT WASHER M6 (10 PCS.)
FOR USA, CAN
1
HEX. SOCKET HD. BOLT (W/FLANGE) M6 X 20
1 1
TAPPING SCREW (W/FLANGE) D5 X 25 (BLACK)
1
MACHINE SCREW M4 X 16 (10 PCS.)
1
45
669-8541 DECOMP.
1
*
46
668-5782 SPARK PLUG BPMR7A
1
*
46
668-5780 SPARK PLUG BPM-7A
1
47
669-8549 INTAKE PACKING (C51)
1
48
669-8906 INTAKE (CS51)
1
2 - 12
REMARKS
*ALTERNATIVE PARTS
-3-
PARTS ITEM NO.
CS 51EAP
CODE NO.
DESCRIPTION
NO. USED
49
669-8551 CAB. INSULATOR RUBBER
1
50
669-8552 CARBURETOR INSULATOR (C51)
1
51
669-8907 FUEL PIPE (FKM)
1
52
669-8705 CARBURETOR ASS'Y
1
53
668-5210 SCREW
1
54
668-5212 PUMP GASKET
1
55
668-5213 PUMP DIAPHRAGM
1
56
668-4700 INLET SCREEN
1
57
668-5215 NEEDLE VALVE
1
58
669-0873 VALVE SPRING
1
59
668-5220 DIAPHRAGM PACKING-METERING
1
60
668-4690 METERING DIAPHRAGM
1
61
668-5222 DIAPHRAGM COVER-METERING
1
62
669-0766 IDLE ADJUST SPRING
1
63
668-5298 IDLE ADJUST SCREW
1
64
668-5218 HINGE PIN SET SCREW
1
65
668-5217 CONTROL LEVER
1
66
668-5219 HINGE PIN
1
67
668-5223 SET SCREW
1
*
68
669-8908 FUEL PIPE
1
*
68
669-8930 FUEL PIPE
1
69
668-5408 WASHER 5
5
70
669-6317 HEX. SOCKET HD. BOLT M5 X 45
2
71
669-8553 CLEANER SUPPORT (C51)
1
72
669-8721 FUEL PIPE
1
73
669-8537 CYLINDER
1
74
669-8538 SCAVENGING COVER (A)
1
75
669-8542 CYLINDER PACKING (C51)
1
76
669-8534 PISTON RING
2
77
669-8909 PISTON (44) (M)
1
78
669-6854 CIRCLIP
2
79
669-8910 PISTON PIN COLLAR (C51)
2
80
669-8531 ENGINE CASE (B) ASS'Y
1
81
669-8914 OIL SEAL
2
82
620-2C3
2
83
669-8532 CRANK SHAFT
1
84
669-8535 CRANK CASE PACKING (C51)
1
85
669-6855 PISTON PIN
1
86
669-8911 NEEDLE BEARING (A)
1
87
669-8530 ENGINE CASE (A) ASS'Y
1
88
669-8709 REAR DAMPER (C51)
1
89
669-8572 BRAKE HANDLE
1
*
90
669-8924 CAUTION LABEL (A) (EURO)
1
*
90
669-8925 CAUTION LABEL (C) (USA)
1
91
669-8912 BRAKE LEVER SPRING (B)
1
BALL BEARING 6202C3
92
668-5369 CHOKE ROD RUBBER
1
*
93
669-8593 CHOKE BUTTON (VERMILION)
1
*
93
669-8594 CHOKE BUTTON (GREEN)
1
94
669-8565 OPERATION PLATE
1
95
669-6940 STOP SWITCH
1
-4-
*ALTERNATIVE PARTS
REMARKS
INCLUD. 53-67
FOR USA, CAN
INCLUD. 81, 82
INCLUD. 81, 82
FOR USA, CAN
FOR USA, CAN
2 - 12
PARTS ITEM NO.
CS 51EAP
CODE NO.
111
DESCRIPTION NAME PLATE
NO. USED
REMARKS
1
112
669-8581 FLANGE NUT M8
3
*
113
669-8585 SIDE CASE SUB
1
*
113
669-8586 SIDE CASE SUB
1
114
669-8591 CHAIN PULLER BOLT
1
*
115
668-7270 SAW CHAIN 13 INCH
1
EXCEPT FOR USA, CAN
*
115
668-7335 SAW CHAIN 15 INCH
1
EXCEPT FOR USA, CAN
*
115
668-7296 SAW CHAIN 16 INCH
1
*
115
668-7284 SAW CHAIN 18 INCH
1
*
115
669-8710 SAW CHAIN 20 INCH 0.325
1
FOR USA, CAN
116
669-8592 GUIDE PLATE (B)
1
*
117
669-6911 CHAIN BAR 13 INCH
1
EXCEPT FOR USA, CAN
*
117
669-6912 CHAIN BAR 15 INCH
1
EXCEPT FOR USA, CAN
*
117
669-6983 CHAIN BAR 16 INCH
1
*
117
669-6982 CHAIN BAR 18 INCH
1
*
117
669-8641 CHAIN BAR 20 INCH
1
118
669-6868 OIL GROMMET (A)
1
119
669-8719 FUEL PIPE
1
120
668-5407 BOLT WASHER D5
1
121
669-8455 OIL FILTER
1
122
669-8536 OIL FILTER BODY
1
123
669-8561 GUIDE PLATE (A)
1
124
669-8913 DAMPER (C51)
2
125
669-6894 CHAIN CATCHER
1
126
669-8587 BRAKE LINK
1
127
669-8588 BRAKE SPRING
1
128
669-8589 BRAKE BAND
1
129
668-5391 NEEDLE ROLLER D3
1
130
669-8590 BRAKE LINK COVER
1
131
669-8560 CLUTCH
1
132
669-6882 CLUTCH WASHER (B)
1
133
669-8558 CLUTCH HOUSING
1
134
669-6884 NEEDLE BEARING
1
135
669-8557 RIM SPROCKET
1
136
669-8556 CLUTCH WASHER
1
137
669-8555 OIL PUMP COVER (C51)
1
138
669-6886 WORM
1
139
668-5371 AIR VENT SPONGE
1
140
668-5370 AIR VENT VALVE (B)
1
141
305-812
1
TAPPING SCREW (W/FLANGE) D4 X 16 (BLACK)
142
669-8805 REAR HANDLE GRIP
1
*
143
668-5350 TRIGGER LOCKOUT (VERMILION)
1
*
143
668-5420 TRIGGER LOCKOUT (GREEN)
1
144
669-6838 THROTTLE LEVER SPRING
1
145
NUMBER PLATE
1
146
669-8579 REAR HANDLE
1
147
668-5282 SPRING PIN 5 X 25
1
148
669-8564 THROTTLE ROD
1
*
149
669-8916 THROTTLE LEVER (VERMILION)
1
*
149
669-8917 THROTTLE LEVER (GREEN)
1
2 - 12
*ALTERNATIVE PARTS
FOR USA, CAN
FOR USA, CAN -5-
PARTS ITEM NO.
CS 51EAP
CODE NO.
DESCRIPTION
NO. USED
REMARKS
150
669-8580 AIR VALVE CAP
1
151
668-5351 INNER CAP
1
152
669-6167 FUEL GROMMET
1
153
669-2285 PUMP FILTER BODY
1
154
669-6873 FRONT DAMPER
1
155
669-8409 SPRING HOLDER
2
156
669-6872 FLANGED TAPPING SCREW D6
2
157
669-8408 ANTIVIBRATION SPRING
2
158
669-8921 TANK MARK LABEL (50:1)
1
159
668-5179 TANK CAP PACKING
2
*
160
669-8854 FUEL TANK CAP ASS'Y (VERMILION)
2
INCLUD. 159
*
160
669-8855 FUEL TANK CAP ASS'Y (GREEN)
2
INCLUD. 159 FOR USA, CAN
161
988-054
1
162
669-8548 PLUG CAP
1
163
669-8545 CORD (A)
1
164
669-8546 CORD (B)
1
165
669-8547 METAL FITTING OF PLUG CAP
1
166
669-8544 IGNITION COIL
1
167
669-6326 HEX. SOCKET HD. BOLT (W/FLANGE) M4 X 18
2
168
669-8918 MAGNETO ASS'Y
1
169
669-8543 MAGNETO ROTOR
1
170
669-8417 STARTER PAWL SPRING
2
171
669-6857 WASHER 0.8
2
172
669-6877 STARTER PAWL
2
173
669-6434 SHIM
2
174
669-6878 STEP BOLT
2
175
669-8571 AIR DEFLECTOR
1
*
176
669-8583 RECOIL STARTER
1
*
176
669-8584 RECOIL STARTER
1
177 *
178
CABLE TIE
HITACHI LABEL
INCLUD. 169-174
FOR USA, CAN
1
669-8923 CAUTION LABEL (L)
1
FOR USA, CAN
STANDARD ACCESSORIES ITEM NO.
CODE NO.
DESCRIPTION
NO. USED
*
501
668-5439 CHAIN COVER 14"
1
*
501
669-6909 CHAIN COVER 16"
1
*
501
669-6910 CHAIN COVER 18"
1
*
501
669-8577 CHAIN COVER 20"
1
502
669-8582 COMBI BOX SPANNER 13 X 19
1
-6-
*ALTERNATIVE PARTS
REMARKS FOR 13", 15" CHAIN BAR
Printed in Japan (120202N)
2 - 12
LIST NO. F008
ENGINE ENGINE CHAIN SAW Model CS 51EA
2012 · 2 · 2 (E2)
1
6 7
2
3 4 38
5 8
53
63
9
69
68
62 31
10 54
11
70
51
69
55
31
C
52
56
12 13
71
50 49
14
38
21
64
48
A
47
46 15
65 57
45
66
B
58
22 59 72
16
23 24
18
37
20
25
60
73
17 19
61
67
24 25 18
26 40
89 16
27 39 28
29
30
90
74 28 69
42
75
44
38 43
37
41
36
76
35
69
31
28
77 32 78 33
93
91 92
79 85
34
95
78 94
86 79
81 80
88
82 87
82
83
81
84
A
CS 51EA
126 111
501
502
127 128
112
129 130
113
131 132
116
133
16
134 117
114
135 136
16
115
16 137 138
141 118 119
142 31
139
148
120 121 122
16
140
143 149 144
150
123
151
161
145
C
152 163
162
146
153 124
31
164
154
15
147
33 125 10 158
155
169
166 167
156
157
168
165 157
156
155
B
170 171
10
159 172 173 174
160
112
15 124
159
160 175 177 176 4
-2-
2 - 12
PARTS ITEM NO.
CS 51EA
CODE NO.
DESCRIPTION
NO. USED
1
669-8919 START LABEL (C51) (EX)
1
2
669-8568 CLEANER COVER (C51)
1
3
669-8569 SHUTTER PLATE
1
4
669-6903 COVER SET BOLT
7
5
669-8708 CYLINDER COVER (C51)
1
6
669-8595 CLEANER KNOB (VERMILION)
1
7
669-8570 KNOB PACKING
1
8
669-8563 CLEANER ELEMENT (B)
1
669-8562 CLEANER ELEMENT (A)
1
10
9
669-8449 NUT M6
3
11
949-432
12
669-8429 SPRING HOLDER
1
13
881-722
1
14
669-8428 ANTIVIBRATION SPRING
1
15
668-5413 DAMPER SET BOLT
3
16
669-6835 SEAL LOCK SCREW M4 X 10
18
17
669-8539 SCAVENGING COVER (B)
1
18
669-8540 COVER PACKING (C51)
2
19
669-8903 EXHAUST PIPE (C51)
1
20
669-8575 MUFFLER GAUZE (C51)
1
21
305-558
22
669-8578 FRONT HANDLE
23
302-089
TAPPING SCREW (W/FLANGE) D5 X 20 (BLACK)
2
24
949-812
HEX. SOCKET HD. BOLT M4 X 10 (10 PCS.)
5
25
949-429
BOLT WASHER M4 (10 PCS.)
5
26
669-8904 MUFFLER PROTECTOR
1
27
669-8905 MUFFLER PROTECTOR GAUZE
1
28
949-219
3
29
669-8900 OIL PIPE (CS40)
1
30
669-8554 OIL PUMP
1
31
668-5311 CLIP
5
32
668-5412 SEAL LOCK HEX. SOCKET HD. BOLT M5
4
33
669-8901 SEAL LOCK SCREW M5 X 12
3
34
668-5400 SPIKE
1
35
669-8902 SEAL LOCK HEX. SOCKET HD. BOLT M5 X 45
2
36
669-8706 MUFFLER CAP
2
37
669-8899 SEAL LOCK HEX. SOCKET HD. BOLT M6 X 20
6
38
669-6836 HEX. SOCKET HD. BOLT M5 X 12 (PRECOTE)
5
39
669-8573 MUFFLER (C51)
1
40
669-8576 MUFFLER PACKING (C51)
1
41
668-5308 FUEL GROMMET (A)
1
42
669-8787 GROMMET
1
43
668-5267 FUEL PIPE 2.5 X 4 X 90
1
44
668-5139 PRIMING PUMP COMP.
1
45
669-8541 DECOMP.
1
*
46
668-5780 SPARK PLUG BPM-7A
1
*
46
668-5782 SPARK PLUG BPMR7A
1
47
669-8549 INTAKE PACKING (C51)
1
48
669-8906 INTAKE (CS51)
1
49
669-8551 CAB. INSULATOR RUBBER
1
2 - 12
BOLT WASHER M6 (10 PCS.) HEX. SOCKET HD. BOLT (W/FLANGE) M6 X 20
TAPPING SCREW (W/FLANGE) D5 X 25 (BLACK)
REMARKS
1
2 1
MACHINE SCREW M4 X 16 (10 PCS.)
*ALTERNATIVE PARTS
-3-
PARTS ITEM NO.
CS 51EA
CODE NO.
DESCRIPTION
NO. USED
50
669-8552 CARBURETOR INSULATOR (C51)
1
51
669-8907 FUEL PIPE (FKM)
1
52
669-8705 CARBURETOR ASS'Y
1
53
668-5210 SCREW
1
54
668-5212 PUMP GASKET
1
55
668-5213 PUMP DIAPHRAGM
1
56
668-4700 INLET SCREEN
1
57
668-5215 NEEDLE VALVE
1
58
669-0873 VALVE SPRING
1
59
668-5220 DIAPHRAGM PACKING-METERING
1
60
668-4690 METERING DIAPHRAGM
1
61
668-5222 DIAPHRAGM COVER-METERING
1
62
669-0766 IDLE ADJUST SPRING
1
63
668-5298 IDLE ADJUST SCREW
1
64
668-5218 HINGE PIN SET SCREW
1
65
668-5217 CONTROL LEVER
1
66
668-5219 HINGE PIN
1
67
668-5223 SET SCREW
1
68
669-8908 FUEL PIPE
1
69
668-5408 WASHER 5
5
70
669-6317 HEX. SOCKET HD. BOLT M5 X 45
2
71
669-8553 CLEANER SUPPORT (C51)
1
72
669-8721 FUEL PIPE
1
73
669-8537 CYLINDER
1
74
669-8538 SCAVENGING COVER (A)
1
75
669-8542 CYLINDER PACKING (C51)
1
76
669-8534 PISTON RING
2
77
669-8909 PISTON (44) (M)
1
78
669-6854 CIRCLIP
2
79
669-8910 PISTON PIN COLLAR (C51)
2
80
669-8531 ENGINE CASE (B) ASS'Y
1
81
669-8914 OIL SEAL
2
82
620-2C3
83
669-8532 CRANK SHAFT
1
84
669-8535 CRANK CASE PACKING (C51)
1
85
669-6855 PISTON PIN
1
86
669-8911 NEEDLE BEARING (A)
1
87
669-8530 ENGINE CASE (A) ASS'Y
1
88
669-8709 REAR DAMPER (C51)
1
89
669-8572 BRAKE HANDLE
1
*
90
669-6336 CAUTION LABEL (E)
1
*
90
669-6335 CAUTION LABEL (D)
1
91
669-8912 BRAKE LEVER SPRING (B)
1
92
668-5369 CHOKE ROD RUBBER
1
93
669-8593 CHOKE BUTTON (VERMILION)
1
94
669-8565 OPERATION PLATE
1
95
669-6940 STOP SWITCH
1
111
BALL BEARING 6202C3
NAME PLATE
INCLUD. 53-67
INCLUD. 81, 82
2
INCLUD. 81, 82
FOR AUS, NZL
1
112
669-8581 FLANGE NUT M8
3
113
669-8585 SIDE CASE SUB
1
-4-
REMARKS
*ALTERNATIVE PARTS
2 - 12
PARTS ITEM NO.
CS 51EA
CODE NO.
DESCRIPTION
NO. USED
114
669-8591 CHAIN PULLER BOLT
1
*
115
668-7270 SAW CHAIN 13 INCH
1
*
115
668-7335 SAW CHAIN 15 INCH
1
*
115
668-7296 SAW CHAIN 16 INCH
1
*
115
668-7284 SAW CHAIN 18 INCH
1
*
115
669-8710 SAW CHAIN 20 INCH 0.325
1
116
669-8592 GUIDE PLATE (B)
1
*
117
669-6911 CHAIN BAR 13 INCH
1
*
117
669-6912 CHAIN BAR 15 INCH
1
*
117
669-6983 CHAIN BAR 16 INCH
1
*
117
669-6982 CHAIN BAR 18 INCH
1
*
117
669-8641 CHAIN BAR 20 INCH
1
118
669-6868 OIL GROMMET (A)
1
119
669-8719 FUEL PIPE
1
120
668-5407 BOLT WASHER D5
1
121
669-8455 OIL FILTER
1
122
669-8536 OIL FILTER BODY
1
123
669-8561 GUIDE PLATE (A)
1
124
669-8913 DAMPER (C51)
2
125
669-6894 CHAIN CATCHER
1
126
669-8587 BRAKE LINK
1
127
669-8588 BRAKE SPRING
1
128
669-8589 BRAKE BAND
1
129
668-5391 NEEDLE ROLLER D3
1
130
669-8590 BRAKE LINK COVER
1
131
669-8560 CLUTCH
1
132
669-6882 CLUTCH WASHER (B)
1
133
669-8558 CLUTCH HOUSING
1
134
669-6884 NEEDLE BEARING
1
135
669-8557 RIM SPROCKET
1
136
669-8556 CLUTCH WASHER
1
137
669-8555 OIL PUMP COVER (C51)
1
138
669-6886 WORM
1
139
668-5371 AIR VENT SPONGE
1
140
668-5370 AIR VENT VALVE (B)
1
141
305-812
142
669-8805 REAR HANDLE GRIP
143
668-5350 TRIGGER LOCKOUT (VERMILION)
1
144
669-6838 THROTTLE LEVER SPRING
1
145
NUMBER PLATE
1
TAPPING SCREW (W/FLANGE) D4 X 16 (BLACK)
1 1
146
669-8579 REAR HANDLE
1
147
668-5282 SPRING PIN 5 X 25
1
148
669-8564 THROTTLE ROD
1
149
669-8916 THROTTLE LEVER (VERMILION)
1
150
669-8580 AIR VALVE CAP
1
151
668-5351 INNER CAP
1
152
669-6167 FUEL GROMMET
1
153
669-2285 PUMP FILTER BODY
1
154
669-6873 FRONT DAMPER
1
155
669-8409 SPRING HOLDER
2
2 - 12
REMARKS
*ALTERNATIVE PARTS
-5-
PARTS ITEM NO.
CS 51EA
CODE NO.
DESCRIPTION
NO. USED
156
669-6872 FLANGED TAPPING SCREW D6
2
157
669-8408 ANTIVIBRATION SPRING
2
*
158
669-8921 TANK MARK LABEL (50:1)
1
*
158
669-8922 TANK MARK LABEL (25:1)
1
159
668-5179 TANK CAP PACKING
2
160
669-8854 FUEL TANK CAP ASS'Y (VERMILION)
2
161
988-054
CABLE TIE
1
162
669-8548 PLUG CAP
1
163
669-8545 CORD (A)
1
164
669-8546 CORD (B)
1
165
669-8547 METAL FITTING OF PLUG CAP
1
166
669-8544 IGNITION COIL
1
167
669-6326 HEX. SOCKET HD. BOLT (W/FLANGE) M4 X 18
2
168
669-8918 MAGNETO ASS'Y
1
169
669-8543 MAGNETO ROTOR
1
170
669-8417 STARTER PAWL SPRING
2
171
669-6857 WASHER 0.8
2
172
669-6877 STARTER PAWL
2
173
669-6434 SHIM
2
174
669-6878 STEP BOLT
2
175
669-8571 AIR DEFLECTOR
1
176
669-8583 RECOIL STARTER
1
177
HITACHI LABEL
REMARKS
FOR ASIA, CHN, IND, TPE, KOR INCLUD. 159
INCLUD. 169-174
1
STANDARD ACCESSORIES ITEM NO.
CODE NO.
DESCRIPTION
NO. USED
*
501
668-5439 CHAIN COVER 14"
1
*
501
669-6909 CHAIN COVER 16"
1
*
501
669-6910 CHAIN COVER 18"
1
*
501
669-8577 CHAIN COVER 20"
1
502
669-8582 COMBI BOX SPANNER 13 X 19
1
-6-
*ALTERNATIVE PARTS
REMARKS FOR 13", 15" CHAIN BAR
Printed in Japan (120202N)
2 - 12
