The problem is that the driver is not returning to the full upright position and the nails are pushed into the driver causing the jam. I have replaced the driver and orings but can't figure out why the driver stops about 1/2 " below the top position. I can't find any info on the stages the nailer goes through to cycle or I could probably figure it out.
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Re: D51844 nails jam
The problem that you are experiencing could be caused by several conditions within the gun. Lets work thru the possibilities. First make sure that the nails are correct for the gun. Place a stick of nails on the outside of the magazine with the first nail aligned with the path of the driver. The stick of nails should align perfectly with the path of the driver and also with the magazine. If they do not, don't use the nails. Check with dealer for correct nail. I find that short nails (around 2") will have a tendancy to jamb.
The driver will not travel to top of cylinder if the driver oring/ring is too worn or the driver is bent. The driver should fit snug into the cylinder but be able to travel rather freely . At the bottom of the cylinder check that the bumper is not missing pieces or is cracked. Some nailers have a washer below the bumper that fits snugly around the driver shaft. The bumper and washer prevent too much air from leaking down thru the nose and helps to push the driver back up to top. There is a check valve around the med section of the cylinder that is what actually caused the piston to return to the top with force. You must remove the cylinder to check. Parts are available at www.toolpartsdirect.com. There is also a rebuild kit for this gun. Enjoy
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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.
Assuming that the gun will not jam with nails removed and the driver returns to top of cylinder when fired without nails. If the driver is bent the nailer will jam without nails. Jamming is usualy caused by bent driver, driver tip worn (not square), or wrong nails. If the driver is not bent and the tip is square, suspect wrong nails. Easy test. Place a strip of nails on outside of rails with the nail heads aligned with top of rail. Move the strip of nails toward the nose if gun. With the heads aligned with the top of the rail, the first nail should align with the path of the driver. If the first nail does not align with the path of the driver and the head is angled slightly away from the path of the driver, the driver may strike the shaft of the first nail pushing the nails back into the rails. If the head of the first nail is forward with the nail shaft angled back away, the nail will flip causing jam. The first nail should align with the path of the driver to prevent jam. It is difficult to find perfectly made nails that align correctly. But certainly check the nails with test mentioned above with every new box for accuracy. You might find that you will need to change brands to get a good fit. Good luck.
Your gun uses 30 -34 degree
clip head paper tape. Order a sample of the nail below. It may work on your gun. These are offset full round head with paper tape. Safe way to test if nails will work is to remove the head of the gun and insert nails into rails. Push down on the driver with wood handle of hammer to eject nail. This will test for jamming or two nails trying to eject and cause jam. Look down barrel to see if the head is alighed correctly or too far from centerline of driver.
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.
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
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.
if its new warranty it, otherwise all it should need is a rebuild kit . its just a bunch of orings and gaskets. pretty easy to do. take some pictures as you take it apart to help with reassembly. Dewalt should have scematicsonline or ereplacements.com
The Dewalt D51844 uses a full round head 20 degree nail. Sometimes the generic brand nails are not made exactly to the stated degree. They do this so their nails will work on a variety of nailers. Best to check the nails angle in relation to the angle of your nailer. Place a strip of nails on the outside of the rail. Align the heads of the nails to a convenient straight edge on the rail then check that the head and shaft of the first nail is aligned with the barrel. If the lower part of the nail projects out further than the head, then the driver will miss the head. If the head of the first nail appears close enough to barrell for the driver to hit it then place a new strip of nails into the mag and slide the pusher foward. Fire one nail, if success, remove the nails from the mag and check if the plastic holding the nails together is projecting in front of the first nail. Sometimes the plastic is not right, too stiff, and will not let the next nail align with the barrell. If the next nail appears ready and slides forward then the driver may not be going all the way up after shot. Check by inserting a metal rod into barrell and push driver up till it stops. If the driver is in the uppermost position, then most likely brand of nails. Use Dewalt nail. Good Luck