Question about NRS Paslode T250-f16,s200-s16 Nailer & Stapler O`ring Parts

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Paslode t250 f16 leaks air from the cap difuser

All air gets out from top sometimes as soon as air supplied and as soon you pull trigger. Do i change all inside orings and seals or total rebuild?The gun has not used every day just on side jobs for seven years.

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  • 1,388 Answers

The most common problem with this nailer is the plastic seal that sits on top of the cylinder. This seal (ususlly white, yellow or black in color ) will cause the nailer to leak lots of air out top of gun. Examine seal for cracks and replace as necessary; the part number is 402725 and is available at www.toolpartsdirect.com This should stop the rapid air leak. After installing the new seal, if you have a very small constant leak out top of the gun then remove the screw holding the headvalve in place and check for small scratches where the orings contact headvalve. Use very fine sandpaper (300 to 400 grit) to remove scratches. Clean and re-use the same orings using silicone grease instead of oil and re-assemble. This should stop all leaks. Silicone grease is available at Lowes lumber in the plumbing department. It is used to lube orings in faucets. If you have more questions about this gun please email, Good Luck

Posted on Jan 28, 2009

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I have already changed trigger valve assembly, O rings and all. Still leaks when I try to fire. Will not shoot brads just leaks lots of air around trigger assembly.


Most likely problem is the head valve orings not making perfect seal. Remove the head and pull out the headvalve piston. Apply plenty of white grease to orings and test fire. If gun fires, will need oring kit soon. Good luck

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Air leaking from trigger Bostitch SB1850BN


Most likely the orings or seals in the headvalve are not making perfect seal. Remove the head and pull out the headvalve. Apply plenty of white grease to orings and test again. If the gun fires, then will need oring kit soon, or just keep using plenty of grease. If the gun still does not fire, check that the safety foot is depressing the trigger valve all the way in. Good luck

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Hitachi 45ab blowing air out of trigger


If air leaks thru trigger as soon as you connect airline, replace the vinyl ball under the trigger stem. If air leaks when you depress the trigger, replace the small oring on the trigger stem. If air leaks slightly from plunger in front of the trigger valve, problem is inside of the gun. Remove the head and pull the large circular plate. Replace the large outer oring. Good luck

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1 Answer

Blowing air out of trigger


Leaking under trigger could be the ball seal part # 875645 if leak starts as soon as you connect the air hose. If no air leaks when you connect hose but begins to leak when you depress the trigger then replace the oring on the plunger which is part # 874820. If air leaks when you connect the hose and the ball mentioned above is good then most likely is leaking from oring # 876161 installed on cylinder plate (remove head and pull out the plate). Good luck.

Feb 10, 2014 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

DeWalt D51823 nailer shoots continusously when plugged into air hoswe


Shooting continusously caused by worn orings in the trigger valve and in the gun.Dewalt framing nailers use some vinyl orings (gold or clear in color) that fail too soon in both the trigger and the cylinder spacer (white plastic). Air out the nose of gun indicates air is leaking past the cylinder spacer seals (If piston is pushed down with air leak then headvalve seal is leaking (remove nails for this test)). If piston is not pushed down with leak, remove head and pull out the cylinder with cylinder spacer (white plastic). Place the cylinder on workbench with bottom up. Push down on locking ring and remove retainer to release all the other parts. Take picture or take note of parts together and as you pull them off to aid in re-assembly. You will need to replace the two orings between the white cylinder spacer and the cylinder. Order oring kit from dewalt or just purchase one ( # 141 universal oring ) and one metric oring 74.4mm x 3.1mm from hydraulic parts store. If the piston was pushed down with air leak, replace headvalve orings in the head. The trigger valve also has vinyl orings on the trigger pin. You could try replacing the orings but hard to find . Pin uses 2mm x 1.5mm. The orings on the inner valve should fit snuggly on the outer contact surface. If the valve just falls out the the body, the orings are too loose or the body is worn. I would just replace the trigger valve to be safe, however repaired works ok if you can find the orings. Trigger orings do not come in the kit. I would also remove the nails after each use and only reinstall them after air is connected and gun seems to work as it should. The Good luck with your repair.

Dec 23, 2012 | Air Tools & Compressors

1 Answer

D51822 plunger will fire (and impact wood) but will not retract enough to grab/push out a nail.


Dewalt nailers have some vinyl orings that fail. Usually found within the trigger valve, headvalve, and between the cylinder and cylinder spacer (white plastic piece). A dewalt nailer with failing orings may not leak air however. The vinyl orings tend to start to crumble and the tacky-crumbling pieces tend to create a seal. Easy way to check condition of the vinyl seals in a Dewalt is to remove the trigger valve and look at the orings on the firing pin/stem (2mmx1.5mm orings). If these two orings are soft and sticky, then orings inside of gun most likely the same. Check band on the outside of the cylinder (part # 390159-00) is what causes piston to return to top. But also check to too tight or too loose piston oring, bent shaft of driver and worn/ broken lower bumper. If all is well with internal parts and piston does not return to top, too much air is leaking past nose of gun. Oring kit sold by dewalt will contain most of the orings needed. The kit may not have orings for the trigger. You will at need two orings (2mm x 1.5mm) for the trigger valve stem or just replace the valve. Use white grease or silicone paste lube on all the orings. Good luck.

Nov 10, 2012 | Dewalt Heavy - Duty 31° Clipped Head...

1 Answer

DeWalt D51822 Framing Nailer: Replaced the trigger valve and air is still coming from the nose of the gun. I would think no air should get past the trigger valve until pressed. What's wrong?


Dewalt framing nailers use some vinyl orings (gold or clear in color) that fail too soon in both the trigger and the cylinder spacer. Air out the nose of gun indicates air is leaking past the cylinder spacer seals (If piston is pushed down with air leak then headvalve seal is leaking (remove nails for this test)). If piston is not pushed down with leak, remove head and pull out the cylinder with cylinder spacer (white plastic). Place the cylinder on workbench with bottom up. Push down on locking ring and remove retainer to release all the other parts. Take picture or take note of parts together and as you pull them off to aid in re-assembly. You will need to replace the two orings between the white cylinder spacer and the cylinder. Order oring kit from dewalt or just purchase one ( # 141 universal oring ) and one metric oring 74.4mm x 3.1mm from hydraulic parts store. If the piston was pushed down with air leak, replace headvalve orings in the head. Good luck with your repair

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1 Answer

Paslode stapler


Several things to check for piston not returning to top of cylinder. Most common problem is bent/ broken driver. Worn oring on piston is second most common. Piston should move easily in cylinder but hold in place. Point nose of gun up then down again, if the piston moves within cylinder, replace the oring. Lower bumper and washer with slot under the bumper must be in good condition. If the bumper is cracked or missing pieces and or if the washer fits too loose around the driver blade, the piston may not return to top. Finally, pull out the cylinder and make sure that the check-oring is in place around a series of holes on the middle to lower part of the cylinder (small groove cut into cylinder with several small holes). Good luck with your repair

Jun 05, 2012 | NRS Paslode T250-f16,s200-s16 Nailer &...

1 Answer

I installed a new o ring on the plunger but my S200-s16 still does not shoot the staples,.


could be a number of reasons check the trigger or best bet it to fully disassemble and check all seals and orings without being able to see for myself what it is doing exactly that the best I can do

Jul 06, 2011 | NRS Paslode T250-f16,s200-s16 Nailer &...

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