Question about Chicago Pneumatic CP7749-2 1/2 Inch Air Impact Wrench 725 Ft/Lbs

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I have a Bostich coil roofing nailer #RN46-1 leaking air at trigger area when depressed. Replaced trigger assy but same results. Anything else it could be?

Sounds like your gun needs servicing. normally strip, clean and usually fit new O rings to head valve assy, piston & usually sleeve.

Mar 29, 2014 | Stanley Bostitch Rn461 Gun Coil Roofing...

1 Answer

Paslode PowerMaster Plus air nailer, model F350S. Air valve in trigger appears to be stuck open. air blows all the time when air line is attached. I cleaned and blew out all interior components and air...

Part # 097746 valve pin has a rubber surface that seals when under pressure. To replace this part, remove the trigger then two roll pins in the body of the gun just above the trigger valve. Remove the valve and check for debris or faulty part, replacing as needed (verify the the orings on the outer part of trigger valve are not cut, there also should be a spring pushing down on the valve pin ). If the valve pin is worn, also check orings within the gun for wear, including the largest oring around the cylinder seal. Good luck

May 25, 2012 | Air Tools & Compressors

1 Answer

To the best of my knowledge, I am working on a paslode 3150/38 w16L or R. All visible marking on gun are gone.I went to to identify the unit I'm working on. I was using...

The condition that you describe is caused by air leaking past the oring that makes contact with the cylinder cut into the head of the gun. If the surface of the head is scratched or worn the gun will not fire. Sand the surface with 400 grit sandpaper until smooth or replace the head. Use plenty of silicone paste lube on all the orings. If you feel that the head is in good condition, I would replace the main valve as an assembly (501261Main Valve Assembly).
The lower bumper must not be cracked and the lower driver blade seal should fit snugly around the driver in order for the driver to return to top. The metal sleeve around the bumper is not needed.Good luck

Sep 25, 2011 | Air Tools & Compressors

1 Answer

When I connect my Bostitch N12B to air the plunger/driver will activate completely and not retract. It will then cycle in and out about 1/2 inch continuously. This happens regardless of the trigger or...

Air is leaking past the cylinder seal and trigger valve orings are loose. The seal is no longer made by bostitch however the seal from CN55 max nailer will fit. This seal is sold thru some ebay dealers. You could try a trick I use to get more life out of seal. If seal top surface is smooth without cracks, cafefully remove with breaking and clean inside surface of seal and where it sits on cylinder. Apply a light coat of RTV sealant inside of seal and place onto cylinder cleaning off access sealant. Replace head and do not use gun for 24 hours or less depending on required drying time of sealant. The trigger valve is a TVA6 also sold on ebay in a generic form for under 20 dollars. While gun is apart take a look at the upper bumper at center of headvalve. There should be no cracks and it must be flexable. This part will usually turn to wax and crack, if marginal just replace. Good luck

Nov 22, 2010 | Stanley Bostitch N12b Coil Nailer...

2 Answers

My Porter Cable FN250A only shoots nails sporadically. When I lift up the nose piece, it appears that the "hammer" is not fully retracting.

Piston not retracting is caused by several issues. Bent or broken driver, worn piston oring or loose or broken check seal. Remove head and examine driver for bent or broken, adjust as needed. Check that piston oring fits snug, piston should not drop down cylinder under its own weight. Pull cylinder from body and check that black band (check seal) is in place around holes in cylinder. Good luck

Oct 26, 2010 | Porter Cable Tools & Hardware - Others

1 Answer

Airnailer leaking air ring behund trigger

The valve in the trigger probably needs to have its rubber seals cleaned or O rings may be cracked and need replacement. Silicone grease (white grease) can be smeared on valves to help seal them.

Oct 18, 2010 | Stanley Bostitch Coil Framing Nailer

2 Answers

I have a 73 vw bug stock 1600. with a oil leak on the crankshaft. i change the pulley, with one that has a seal.but it works for a day,then it bows oil all over. Could it be the oil pressure valve is maybe...

check crank shaft for damage, check PCV valve for proper operation, check that pulley sleeve is smooth with no abrasive areas that would chew up a seal, if needed try a speedy sleeve repair kit...

Aug 12, 2009 | 2007 Volkswagen Beetle

1 Answer

Replacing egr valve 2000 Cougar 6 cylinder

First the sleeve is put on the pipe and then the pipe is flared with a flaring tool. The single flare is required to seat and seal on the egr valve if the sleeve is damaged or the threads are messed up then you would have to cut the flare away to remove the sleeve then get the replacement sleeve install the sleeve and reflare the tube as lond as you dont cut off more than the flare itself about 1/8 of an inch you should be good to hook it back to the egr valve. Hope this helps I just changed my Pressure sensor and egr valve and am still getting P1401, but have a feeling its due to carbon build up in the vac lines.

Jun 05, 2009 | 2000 Mercury Cougar

1 Answer

Bostitch n80 framer blow by by trigger asemably

Your nailer incorporates the (tva6) trigger valve. It is available online at, cost is about $20. To examine the valve, remove nails, remove retaining pin holding trigger, remove one or two pins holding tva6 valve (the pins holding the valve are in the body/handle just above the trigger. use punch that fits snuggly in a 3mm hole). Mark the valve in relation to the body of the gun. After several pins are removed apply air pressure to pop-out the valve. Use caution because the valve can came out with force. Reduce air pressure and use heavy glove to catch the valve. With tva6 valve in hand, notice notches on side of valve for roll pins. Remove two more pins to expose the inner valve. The middle seal of the inner valve is usually the problem, it could be cracked or fits too loose. You could try replacing the seal with a tight fitting oring. May work. or just replace the valve. Good luck with your repair.

Apr 20, 2009 | Stanley Air Tools & Compressors

1 Answer

Air leak

Several models of hitachi nailers share the same orings and other parts including the check ball under the trigger pin in your gun. Remove the roll pin holding the trigger to release the trigger pin, (plastic with one oring) then remove the valve with a screwdriver. Replace the vinyl check ball and seal. Parts are available at This should fix the problem that you are describing, however use caution and check that the safety if properly adjusted. Enjoy

Dec 06, 2008 | Hitachi NR83A2 2" To 3 1/4" Full Head...

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