Transcript
NOTES: 4,22,38 Install negator (spring) assembly (ITEM 4) into the back of the pusher (ITEM 22). The clip on the end of the spring should be towards the left side of the magazine. Install the hub/pusher into the back of magazine and slide all the way forward while keeping the magazine pointed down. While keeping the magazine level, reach into the front with a piece of stiff wire bent at 90 degrees to engage the clip on the end of the spring. Pull clip out and engage on the side of the magazine. 21 After inserting into magazine, bend the two tabs back on the left and right side to keep in place. 38 Any magazine repair/replacement on any framing tool that has a date code of 200417 or earlier MUST have the upper contact trip replaced using part number 617170-00 if the new replacement magazine does not have the key hole slot. See SB06063 for details. 48 To remove, first remove ITEM 3. 57 Torque to 190-205 in-lbs. 58,63,80 Torque to 35-45 in-lbs. 62 Torque to 80-95 in-lbs. Top cap screws only. 67 Torque to 55-65 in-lbs.
CAUTION: When servicing Air Tools, it is extremely important that ONLY IDENTICAL REPLACEMENT PARTS BE USED and that REASSEMBLY OF TOOL IS IDENTICAL TO THE ORIGINAL ASSEMBLY. IMPORTANT!
To assure product safety and reliability, all repairs, maintenance, and adjustments should be performed by company-owned or authorized service organizations using identical replacement parts. Instructions for safe operation are included in the instruction manual that was supplied with the product.
608617, Inner Exhaust
Un-Fired Position
608615, Outer Exhaust
390140, Cylinder Seal Red indicates line air
612096, Outer Cylinder 390156, Upper & Lower Bulkhead
608640, Inner Cylinder
608617, Inner Exhaust
Fired Position
608615, Outer Exhaust
390140, Cylinder Seal Red indicates line air
612096, Outer Cylinder 390156, Upper & Lower Bulkhead
Trigger valve allows this air to vent to exhaust, which causes the sleeve to drop and the tool to fire. The air under the piston is forced into the return chamber. This pressurized air is later used to return the piston.
608640, Inner Cylinder
608617, Inner Exhaust
Piston Return
Red indicates line air
608615, Outer Exhaust Once cylinder shifts up and a seal is established by the cylinder seal, the air above the piston gets vented to exhaust.
390140, Cylinder Seal 612096, Outer Cylinder 390156, Upper & Lower Bulkhead
608640, Inner Cylinder Trigger valve allows this air to pass through to bulkhead, which causes the sleeve to shift up.
The pressurized air in the return chamber pushes the piston back to it’s start position.
Trigger Valve Detail Fired Position
Un-Fired Position Upper Housing Oring
Red indicates line air
Upper Pilot Oring
Face Seal Oring Pilot Valve Valve Housing
Lower Housing Oring Stem Oring Lower Pilot Oring
Valve Cap
Trigger Stem
Trouble Shooting Leaks (Un-Fired Position) From exhaust deflector •Cylinder Seal
From nose •Lower Bulkhead Oring •Inner Cylinder Oring
Trigger Valve •Lower Stem Oring •Face Seal •Lower Housing Oring
Leaks (Fired Position) From exhaust deflector •Inner Exhaust Oring •Outer Exhaust Oring •Piston Driver Oring
From nose •Damaged Bumper •Nose Oring
Trigger Valve •Upper Stem Oring •Upper Pilot Oring •Upper Housing Oring
DeWalt Framing Nailer Troubleshooting / Repair Guidelines
I)
Symptom:
Skips fasteners (won’t fire a nail every time)
1) Wrong nails used e.g. clipped head nails in a full round tool or vice versa – or wrong nail angle e.g. Bostitch type 28 deg nails will not work. Full Round is 20-22 deg only. Clipped is 31 to 34 deg only 2) Worn Bumper (Only open the tool up at this point if the tool leaks out the nose when driver is down or if the tool is really driving nails too deep) 3) Ensure nails are feeding into the nose properly. 3.1) Does pusher slide freely in magazine? 3.1.1) Magazine pinched - repair (spread) / replace 3.1.2) Pusher spring broken or kinked / hub broken– replace pusher spring SA 3.1.3) Sticky pusher? Spray lube or lightly oiling the magazine will help the pusher slide freely. 3.1.4) Top Guide Clearance too small. Repair/replace 3.2)
Nails getting stuck in magazine.
3.2.1) Magazine pinched ? - repair (spread)/replace as necessary 3.2.2) Nail Shanks getting side by side. – magazine is spread open too far – repair /replace 3.2.3) Poor nail collation – Plastic not breaking clean or breaking up too easily, Paper – too weak, nails are bunching or paper is debonding from stick. 3.2.3) Top Guide Clearance too small. Repair/replace 3.3)
Nose Bolts Loose? See Section (I.6)
3.4)
Magazine loose ? - inspect latch & screws, repair /replace as needed. The magazine will have some play unless it is bolted then it shouldn’t have any. You have to judge whether the amount of play in the magazine is causing feeding issues - usually this is not the case.
4) Air pressure too low. Must be a minimum of 70 psi at the tool. Also nailing rate may be too high for compressor to keep up or there is too much pressure drop. i.e. Hose too long or too many tools running off one compressor etc. – Try increasing pressure at the compressor, slow down, run less tools, shorten hose or increase fitting and hose size to 3/8”. 5) Nails jump up over pusher. 5.1) Excessive recoil. Hardwood, over driving the nail (high pressure), worn bumper etc. 5.2) Pusher not following nails i.e. getting stuck. See section (I3.1) 5.3) Too much top guide clearance 5.4) Correct pusher used? - e.g. (FR silver pusher) for the Full round tool. 5.5) Worn nose. (not likely to cause this problem but possible) 6) Nose Screws Loose or Broken - Tighten or replace. (Remove nose first before tightening the screws to ensure nose oring is not damaged – replace as required).
I)
Symptom:
Skips fasteners (won’t fire a nail every time) Continued ….
7) Short stroking the trigger valve. Sometimes you can tell if this is the case by adjusting the depth of drive all the way out and checking to see if the symptoms still persist. If the symptom goes away – then something(s) below is the problem. 7.1) Sticky Contact Trip. Mechanism should slide freely – repair/replace as required to ensure it does move freely. Remove the contact trip spring to be sure the mechanism is not binding, then re-install the spring. 7.2) Short upper trip - replace 7.3) Worn trigger valve stem - replace Trigger Valve SA 7.4) Worn inner trigger – replace 8) Piston oring worn (Driver slides down nose i.e. not held in place) 9) Check Seal Broken or missing - replace 10) Nose oring missing. This should be a very unlikely event. (Checking for this requires you to take the nose off- the screws are loctited so this can be a very cumbersome task ) If the tool at normal pressure skips every other nail – this is a good sign the nose oring is missing or damaged) 11) Cylinder orings not sealing correctly. You can screen for this by checking for leaks out the nose in the unfired position or out the trigger valve in the fired position. You can also screen for this by removing the cylinder SA and placing your thumb over the hole in the side of the bulkhead creating a seal and try to move the cylinder up and down. It should be very tough to move. If it slides easily then there’s a leak – it’s either an oring problem or a bulkhead problem. Inspect the bulkhead closely for a crack. 12) TV leaks - See sections (IX) and (XII)
II)
Symptom:
Jams, Nails Not Sunk, Back Drives, Drives 2 nails.
1) Using correct nails? See section (I.1) 2) Nails too short. Minimum 2” nail length is recommended. Full Round .148 x 1.5” joist hanger nails should work but not perfectly in the full round tool. 3) Nails feed thru magazine OK? See section (I.3) 4) Worn or Broken Driver – replace Driver SA 5) Worn Nose 6) Nose screws loose – See section (I.6) 7) Driver not worn or broken but still not sinking nails (lack of power). Check air pressure. Replace piston oring. Replace trigger valve SA. Check Cylinder SA ensure is moves freely in the tool also see section (I.11). Grease all orings and sealing surfaces.
8) If you can find no problems with the above – replace the driver SA anyway and see if the problem improves.
III)
Symptom:
Won’t Actuate – No Leaks at all when Contact Trip is depressed and trigger pulled.
1) Check for smooth and full travel of the contact trip. Did someone just swap out the trigger? Is the contact trip guide held in place by the trigger pin? This is a common mistake – if the trip guide is not in place it won’t allow the contact trip to fully stroke. 2) Short stroking the trigger valve. See section (I.5) 3) Is trigger valve working? Check for this by doing the following. Remove all fasteners, if not already done. Remove trigger. Point tool in a safe direction. Attach air and depress the stem directly. You should hear the pilot valve move (a small hiss of air with a pop) and/or the tool will actuate fully. If you do then go back to step 2. If the pilot valve does shift but the tool doesn’t actuate, and there is a constant leak from the trigger valve, go to section (IV). If nothing happens at all, replace the trigger valve. If the trigger valve actuates and doesn’t leak but the tool doesn’t fire, then there is something keeping the cylinder from moving – it’s stuck. See section (VI.4).
IV)
Symptom:
Won’t Actuate – Continuous leak from trigger valve with contact trip depressed and trigger pulled.
1) 2) 3) 4)
Cylinder orings not sealing. See section (I.11) Short stroking the trigger valve. See section (I.5) Outer Bulkhead oring(s) damaged or not sealing properly. Inspect outer trigger valve orings and trigger valve bore sealing surfaces in frame for damage / foreign debris. 5) Replace trigger valve.
V)
Symptom:
Won’t Actuate – Continuous leak from the exhaust with the contact trip depressed and trigger pulled.
1) Something is keeping the cylinder from sealing against the cap. See section (VI.4)
VI)
Symptom:
Leaks from exhaust unfired.
1) 2) 3) 4)
Foreign debris on cylinder seal/cap mating surface. Cylinder seal damaged or not seated properly. Cap sealing surface damaged Cylinder not moving freely – not returning all the way back. 4.1) Broken spring retainer or retainer band 4.2) Piston driver broken causing the cylinder to wedge. Check to ensure the cylinder is not damaged. 4.3) Broken cylinder collar 4.4) Bumper Damaged - pieces causing the cylinder to wedge 4.5) Broken cylinder spring 4.6) Swollen orings - clean / rinse out tool replace all orings and trigger valve SA. 4.7) Bulkhead damaged 5) Porous / damaged top cap.
VII)
Symptom:
Leaks from Frame / Top Cap Interface
1) Top Cap bolts tight? 2) Frame seal damaged / missing. 3) Damaged Frame or Cap
VIII) Symptom: 1) 2) 3) 4) 5)
IX)
Symptom:
Leaks from Nose Unfired Lower Bulkhead oring damaged Foreign debris on sealing surface / inside of oring groove on bulkhead Inner cylinder oring not sealing. See section (I.11) for diagnosis. Bulkhead sealing diameter on frame is damaged. Bulkhead is damaged / cracked. See Section (I.11) for diagnosis. Leaks from Trigger Valve Unfired.
1) Inspect lower outer trigger valve oring and trigger valve bore sealing surface in frame for damage / foreign debris. 2) Replace trigger valve.
X)
Symptom:
Leak from Nose with Driver Down (Fired Position)
1) Worn Bumper 2) Damaged Piston 3) Foreign debris in bottom of tool or something between the bottom of piston and the top of the bumper.
XI)
Symptom:
Leak from Exhaust with Driver Down (Fired Position)
1) Dry inner and outer exhaust orings 2) Foreign debris in cylinder exhaust oring or cap exhaust oring grooves or on mating sealing surfaces. 3) Worn inner and outer exhaust orings. 4) Damaged exhaust sealing surfaces of the cylinder or the exhaust button. 5) Top Cap cracked around center screw boss. (not likely) 6) Exhaust button broken. (not likely)
XII)
Symptom: 1) 2) 3) 4) 5) 6) 7)
XIII) Symptom:
Leak from Trigger Valve with Driver Down (Fired Position) Bulkhead orings damaged. Foreign debris on frame/ bulkhead / bulkhead oring groove sealing surfaces Inner or outer cylinder orings not sealing. See section (I.11) Bulkhead cracked. See Section (I.11) Frame / Bulkhead sealing surface damaged. Replace trigger valve. Trigger valve bore sealing diameters (2) in frame damaged. Tool does “odd” things when air is applied.
1) Check for swollen orings / missing orings. See section (VI.4) 2) Replace trigger valve.
