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Piston dose not return to top of cylinder after firing the first nail if this is pushed back up to the top with a thin rod it will fire one more nail need help

Posted by tony owen on


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Alcolu John

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  • 151 Answers

Have you oiled your gun lately? If not, open the tip and put one or two drops of air tool oil (NOT motor oil!) on the drive pin. If you HAVE oiled your gun properly, you may need to disassemble the tip and clean the "varnish" residue (the glue that's used to hold strips of nails together) from the pin and its channel. Use paint thinner, or scrape the metal parts clean with a fingernail or a piece of hard plastic. DO NOT use a metal scraper, as you may damage the gun and create much worse problems.

Posted on Apr 13, 2018


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  • 142 Answers

SOURCE: Gun's drive rod not retracting back after firing a nail

you need a top end rebuild kit

Posted on Jan 05, 2010



  • 55 Answers

SOURCE: paslode impulse cordless nail gun,doesn't pull the

This is an easy fix luckily usually it means that the chamber is dirty and all you have to do is open the top front of the gun so that you can see the piston then take a q-tip and clean the area really well sometimes it requires a degreaser and then when you think that you have it clean make sure to lubricate the chamber really well with the paslode lubricant that came with the gun or they sell it right next to where you get the nails. Then the gun should work fine with no problem if this does not work then this means that the piston might be bent and that could turn into a big problem but is still fixable just harder.

Hope that this works for you

Posted on Dec 01, 2009

Testimonial: "Thanks very much for your help,I took the piston out and sprayed it all out with solvent and relubed everything and it seems to work fine."


David Ford

  • 2176 Answers

SOURCE: paslode im350 piston will not return

It sounds as if the piston o ring is worn. Does the piston drop if you just give it a slight bump with no nails in the magazine, if so that is the problem and would need replaced. Let me know otherwise and I will dig deeper

Posted on Jan 27, 2009


  • 65 Answers

SOURCE: after each shot the nail gun jams

hi visit your supplier and ask for a overhaul kit once fitted your tool will be licke new
best of look ian

Posted on Mar 25, 2009


  • 131 Answers

SOURCE: paslode nail gun not firing

Yes you need to oil driver blade piston.
You need to check for spark. With no nail or gas in it. Take of main cylinder(4bolts on top, 2 bolts on nose. And then put in battery. And then push upper switch(behind roller at top) and the fan will come on. And then pull the trigger. You should have spark.

Posted on Jun 23, 2009

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Now that I have replaced all O-rings and firing valve assembly. Why do the nail heads still hang up with contact on the side of driver rod?

It sounds like your complaint is that the driver isn't returning all the way up and is getting hung up on the next nail?
There is an o-ring on the cylinder near the bottom that covers several small holes around the cylinder (LB1015) - this acts as the check valve and provides the air reserve to push the piston back up - if this o-ring is damaged or missing it will prevent the piston from returning all the way to the top.

26266403-4ukbeyx4iefg4em1tlva0y55-2-0.gif The other thing to check is make sure your driver is not bent or the end chipped / worn.
Best of luck - let me know if this has helped.

Aug 25, 2016 | Senco FP620 Framepro 602 2" - 3 - 1/2"...

1 Answer

Fires first nail will not fire second nail

Ez test. With nails removed, and door open driver should be at top of cylinder. If driver is down replace piston oring. If driver is up, lightly strike nose of gun against softwood. The driver should stay at top. If driver drops with light tap replace piston oring. If driver stays at top dry fire the nailer against softwood. The driver should hit the softwood leaving a mark and return to top. If driver stays down or does not travel all the way up pull the cylinder and make sure checkband is installed. Checkband is oring or rubber band covering series of holes on lower part of cylinder. Good luck

Jun 21, 2015 | Stanley Bostitch Coil Framing Nailer

1 Answer

Hitachi nail gun

If gun firing but nails not being driven could be one of two basic problems:
1. Nail jammed in magazine not allowing nails to move up.
Empty magazine, does follower move to top of magazine. Push gun against work piece, does fan motor start? Yes - jam in magazine or lock out bar not operating. (this would allow nail un to fire when out of nails)
2. Piston/driver not returning fully after firing, hence driver blade on top of next nail instead of behind it. This could again be caused by a jammed nail or just a nail head. Another case of not returning is the combustion chamber not making a good seal, check O rings on framer (they are steel rings on bradders) it may just need a good clean it is surprising how dirty they can get and if not cleaned a build up of dirt could break a seal. If not been cleaned for a long time worth checking piston rings, worst case scenario dirt builds up around the rings and stick fully in requiring new piston if the rings will not come out.
Nail guns work on the principle that an explosion pushes the piston driver forcing a nail into the work piece, after the explosion a vacuum is created and it is this that 'sucks' the piston/driver back up the cylinder.

Mar 27, 2014 | Tools & Hardware - Others

1 Answer

I'm trying to figure out why my PC FN250A won't fire nails. I don't see one jammed. What else can I try?

If the driver is not returning to top of cylinder, the nails will not feed into position. Remove nails from the gun and Insert thin tool into nose to verify that the driver is all the way up. If the driver is already at the top of the cylinder, then nails are not feeding correctly (check for debris in rails or for proper nails). If the driver was not all the way up, check for bent driver blade, loose or too tight piston ring or restriction in the headvalve (upper bumper cracked). Good luck

Jan 18, 2012 | Tools & Hardware - Others

1 Answer

My bostich1664FN was working fine,then it stopped shooting nails.How can I troubleshoot this problem. Thanks John

Here are some easy tests.
Assuming that the gun is firing normally however no nails are ejected. Remove the head of the gun and check if the piston is not returning to top of cylinder (piston needs to return to top for nail to enter into positon under the driver). Piston not returning to top indicates, bent driver or worn oring on piston. Repair /replace as needed. If driver/oring looks good, pull out the cylinder and look for check band in place around series of holes on lower part of cylinder and bumper should not be cracked. Lube all orings with silicone paste lube. Good luck

Sep 06, 2011 | Stanley Bostitch SB1664FN 16 Gauge...

1 Answer

The nails don't advance to the fireing pin

Assuming that the nails are moving ok down the rails and the pusher is in good order, if the driver does not return to the top position, the nails will not move into position. Remove air line to gun. Use metal rod to push driver to top position and verify that nails move into position. If the driver was at the top position, check for debris in rails or wrong nails. Place a strip of nails on the outside of the rails and align the nail heads with the rails. The first nail should align with the path of the driver. If the first nail head is tilted back away from the path of the driver, the driver will just push nails back into the rails and slip past. If nails are correct and driver does not return to top, suspect worn piston oring or cracked lower bumper or lack of lubrication.

Aug 24, 2011 | Stanley Bostitch N80s Nailer -rebuild...

1 Answer

Nail gun will not fire a nail each time but only fires correctly ever other time and leaves dimple from the head firing.

Here are a few tests for you to try. You will need a piece of rubber or coiled up old hose.
First open side door and remove nails. Tilt gun head down then up again to check if piston is loose in the cylinder. The piston should stay in top position. If piston drops to bottom of cylinder remove head and replace piston oring or apply some layers of teflon tape under oring to expand oring slightly untill piston stays at top but still can be pushed down cylinder (look at the lower bumper to make sure that it is not cracked or missing pieces, if it is breaking up the pieces can lodge within the air path to the feeded piston). If driver piston now stays at top, connect air to gun and with side door open contact gun to rubber firing gun noticing the feeder movement. With very rapid firing of the gun, the feeder should move back and fourth just as fast as the driver moves. If the feeder seems to move slower than the driver moves then check/replace spring in feeder piston chamber. If spring seems strong enough in your opinion then problem is restriction in the air supply to feeder, if air path is clear then replace orings to feed piston. You will need to remove the two 6m allen screws at front of gun and split gun apart to check restriction at the oring sealing these two parts. Sometimes debris traped at oring (white oring) will restrict air to feeder. Good luck.

Jun 21, 2011 | Stanley Bostitch Nail Gun

1 Answer

I hav a coil nailer the problem coming is it fires double nail right after one blank shot , i hav tried everything by replacing its all types of O rings also changed the piston but the problem still...

Remove nails from the canister and test fire the gun very rapidly with side door open against hard rubber (old tire or coiled up rubber hose ) to absorb the energy. Look for driver and feeder to move in time together and driver should return to top each time. If feeder appears to lag behind, check feeder orings and air passage to feeder piston. If driver appears to come out out nose too far or if it does not go back to top every time suspect problem with bumper or cylinder check seal. Look at feed check built into the side door. These must make contact with nails to prevent miss fire. If all appears to look normal, replace the TVA6 valve if the firing pin fits/feels loose in body of the valve. Miss fire occurs when nail checks do not hold nails in place (feed checks on door and feed piston) and or the piston does not go all the way back up so the nail can not feed into place. Less often, miss fire is caused by lower bumper missing pieces /cracking and the crumbeling bumper pieces enter the feed piston chamber preventing the feeder from making full travel forward. One more area to check is the head /headvalve. Remove head and pull out headvalve. Remove fine scratches on surface of head where orings make contact (use 400 grit paper) and lube with silicone paste lube (sold at Lowes in the plumbing department). Finally check the cylinder seal sitting on top of the cylinder. It should fit very snugly against the cylinder and not turn. If it can be turned, replace with new or remove and apply RTV sealant and replace, then wait 24 hours before use. Good luck

Apr 09, 2011 | Stanley Bostitch Coil Framing Nailer

1 Answer

Gun fires, leaves good indentation, no nail. WCE working properly, took head apart to look for jam but nothing in there and am using compatible nails. Also oiled it but no luck. Was working fine doing...

Remove nails and use thin tool to push driver all the way up to top of cylinder. If the gun fires one nail then skips, the driver is not returning to top of cylinder. If no nails fire, then nails are not feeding into proper position. Driver must return to top to allow nails to feed into position. Most common problems are bent driver, worn piston oring and bad batch of nails(head too large). Good luck

Jan 14, 2011 | Campbell Hausfeld 2-in 18 Gauge Brad...

1 Answer

Nail fails to fire

The older design was trouble free. Now this new redesign fr350a has been having trouble with stuck headvalve (If you have the valve with quadring instead of oring). Seems like the orings/headvalve fit too tight in head.
The problem that you are describing indicates that the driver is not returning to full top position and not allowing nails to feed forward because driver is blocking path. I would try lubing gun with silicone paste lube (available at Lowes in the plumbing department, used to lube faucet washers). Remove head and pop out headvalve. Lube all oring contact surfaces. You should be able to press in headvalve with your thumbs and valve should return when you release. Next check that the driver is not bent. Driver should move freely but not drop down cylinder under its own weight. Should not be hard to push driver down cylinder. Finally make sure (check seal) is in place located on outer part of cylinder lower half. (remove cylinder from gun, check seal looks like rubber band and fits in a groove, some guns have an oring instead, the check seal is what causes the piston to return to top, is piston oring is too tight or driver is bent or air pressure is too low, the piston will not make it to top )
When new, all parts fit very tight within this gun. The oil that is recommended for this gun is too thin. It works better with silicone paste. Good luck and post again if you have other questions.

Jun 18, 2010 | Porter Cable Cable No. FR350A Rnd Head...

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