Question about Ingersoll Rand 1/2" Inch Impact Gun Wrench 231 C

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Trigger valve sticks full open whenever you pull the triugger with air connected. If you disconnect the air hose and tap the side of the gun the valve returns to the off position. Before I take it apart, what springs, o-rings or gaskets will I need to repair it? I also have and old CP and snapon wrenches with the same problem. The air supply a the sjop is very wet in humid weather and there is no dryer or lubricator in the supply line because the shop owner is too cheap to install one. Bob

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Before taking you gun apart, put a few drops of automatic transmission fluid in the it through the air chuck. Keep it oiled regularly

Posted on Aug 28, 2010

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Porter cable rn175 type 1 roofing nailer. Unit shoots once by itself when first plugged into hose. After that initial shot, gun works perfectly. Unit has been fully rebuilt including trigger valve and...


I have seen this on dewalt and p/c guns. Usually caused by trigger valve but you mention that trigger valve is new. If the headvalve does not seat correctly on the top of the cylinder, the in-rush of air will leak past cylinder seal and push down the piston (feels like you fired the gun ) . Difficult to pin down the problem but could be headvalve is sticking slightly open. I would suspect headvalve orings too tight or spring in head is weak or cylinder in head is worn. Easy to check. Remove the head and push in the headvalve with thumbs. The valve should be stiff to depress but return freely. Check that the cylinder in the head where the outer headvalve oring makes contact is not scratched or worn. If scratched, sand with fine sandpaper till smooth. If worn and depressed, replace head. If spring feels weak, stretch it a bit pulling it apart. Lube cylinder /orings with white grease. Untill you find the problem, do not load nails untill after airline is connected. On the dewalt guns, firing when air is connected is due to the trigger firing pin orings worn. You could check this on your gun by spraying soapy water on the trigger valve under the trigger then connect the airline. If air is blowing out the trigger when you connect air, most likely faulty valve. Good luck and let me know what you find out on the unusual problem.

Nov 01, 2013 | Tools & Hardware - Others

1 Answer

I have a Bostitch N88RH stick nailer with contact trip. For some time, when I connected the nailer (without actuating the trigger or tip), it would fire a nail. Now, it will often fire a nail when first...


Usually, if you change the trigger valve (TVA11) the nailer will function as before. This problem could be also be caused by air leaking past the orings in the headvalve (3 orings). Easy to check. Remove the head and pull out the headvalve (white plastic piston). Look carefully at the cylinder where headvalve orings make contact and look for smooth surface. If scratched or deep groove, replace head or try to smooth out with fine sandpaper. You can make the orings fit more snuggly against the cylinder by using one or two turns of Teflon tape under the oring (just the outside orings). Apply white grease and replace head to test.
As for the trigger valve, remove the trigger to expose the valve. Check if the trigger pin moves from side to side or seems loose. If it seems loose replace the valve. If the valve has a metal pin (many have plastic (metal better)), you can pop out the valve and just replace the orings on the inner plunger. If plastic pin replace the valve. To remove the valve, remove the roll pins in the body of the gun (3mm) and apply air pressure to the gun. Use lower pressure than normal and use a glove or bunched up shop rag to catch the valve as it is pushed out by the air. Could come out with force depending on the pressure. Note the slots on the valve as they relate to the roll pins so you can reinstall correctly. Good luck.

Sep 01, 2013 | Stanley Air Tools & Compressors

1 Answer

Gun is full of nails, but acts like it is empty (the plunger won't advance). You go to tap it with the trigger pulled, and it just does nothing. Seems like firing pin is not getting air or somet


If no air is leaking from the gun, take out the nails, remove trigger by removing 3mm hex head bolt to expose the trigger pin. With air connected and side door open so that you can see the feeder, quickly depress the trigger pin with finger. Gun should fire. If gun does not fire (only makes air sound at trigger) dissconnect airline, remove head and lube headvalve with white grease and reinstall. Test again. If ok replace trigger. If still no joy, replace trigger valve with new factory or generic (part # TVA6). If gun fires but does not activate the feeder claw, remove two 6mm hex bolts from front of gun and split apart upper and lower body and check white oring (part # 149885) Good luck

Oct 16, 2012 | Stanley Bostitch Rn461 Gun Coil Roofing...

1 Answer

Bostitch framming gun sticking?


Most likely the headvalve is sticking. An easy fix would be to remove the head and lubricate the headvalve orings with white grease or silicone paste. The upper bumper should not have any cracks. If the problem continues replace the trigger valve (tva6). The trigger valve can be bostitch or generic sold on ebay for usually less then $20. The trigger valve has an inner valve that can stick due to swolen or hard orings.

Nov 19, 2011 | Stanley Bostitch Nail Gun

1 Answer

When using n60 nailer, one nail goes all the way in, but the next nail only goes halfway in and the some don't go in at all. Don't know what's wrong.


Worn orings in gun and the trigger valve can/will cause problems as you describe. Remove the nails and leave open the latch. Lighty tap the nose of the gun against coiled rubber hose. The driver/piston should stay in the top position (if the driver is down or comes down after test, replace driver oring). Now push the nose against the rubber hose and activate/hold trigger, while holding the trigger/gun in this position, the driver will /should stay down under pressure. At this point no air should leak out of the nose of the gun. If air leaks out of the nose, examine the lower bumper for cracks ( replace as needed ). Finally remove the trigger and examine the firing valve pin. If it has a plastic pin, looks worn and wobbles from side to side, most likely needs to be replaced. If however it has a metal pin and it seems to fit snugly, do not change unless it is leaking air. Good luck

Jun 19, 2011 | Stanley Bostitch Air Nailer Trigger N60...

1 Answer

I have an fc350a nail gun. After firing one time, the piston will not retract until the air hose is removed from the gun.


May need a new firing valve or safety foot is sticking. Easy to check, Remove air supply, nails and remove the trigger to expose the firing pin. Connect air and place the nose of the gun against thick rubber or coiled air hose. Depress trigger and let go. Gun should fire and trigger pin will return to original position. If piston still does not retract then problem is with trigger valve and most likely the rest of the orings within the gun will need replacing. Not expensive. Remove the air supply and look closely at the firing pin, if it moves quite a bit from side to side and looks worn time to replace. If it look to be in good condition, then orings within trigger valve may be swollen and will not allow the trigger to function. You can remove the valve by removing the 3mm roll pins above the valve and applying air pressure to pop out the valve. Use heavy glove to catch the valve because it could come out with force (reduce air pressure to gun if possible). If gun works ok examine safety foot mech for problem. Use silicone paste lube on orings. good luck

Jun 12, 2011 | Porter Cable Cable No. FC350A Clipped Head...

1 Answer

I installed a new grease cartridge in my grease gun and grease does not come out when triggered.


If the gun was working properly before you changed the cartridge, The gun is air-locked
Two things: 1. Make sure the bottom rod is pushed in. 2. Holding the gun by the handle on the top left of the gun, below the hose there is a little metal valve. Push that vent valve down and pull the trigger repeatedly until grease starts to come out.
If that doesn't work. Remove the grease hose, hold the vent valve down, pull the trigger a few times. Then release the valve and pull the trigger until grease comes out. Replace the hose.
And if that doesn't work. Sometimes when you put in a new cartridge the metal "washer" that actually pushes the grease up the cylinder will get caught at the bottom of the new cartridge. Make sure the washer will move freely into the cartridge.
That should do it!

Jan 14, 2011 | Lincoln Automotive Pneumatic Grease Gun...

1 Answer

Stanley bostitch double fires. It is an older stick feed. Works fine when I hold the trigger and tap the tip. But when I press the gun into the wood and pull the trigger it double fires. Gun is older, but...


You did not list your model number, however most bostitch nailers use the tva6 trigger valve. As this valve wears it will be erratic. Examine the firing pin that makes contact with trigger. If it looks worn or wabbles from side to side, then time to replace. To remove valve first remove trigger by removing roll with 3MM punch. Next remove one or two roll pins just above the valve, also 3mm. With roll pins removed air pressure will pop out valve. Be carefull because valve can come out with force, use glove or rag to catch. Parts available at www.toolpartsdirect.com, or generic valve at www.ebay.com. Good luck

Sep 18, 2010 | Stanley Bostitch Coil Framing Nailer

1 Answer

No pressure


It is probably air locked....Here's what you need to do. Connect the garden hose, and HP hose, but not the gun. Turn on the water, and let it run while you make sure that there are no high points in the garden hose that can trap air....Work the hose so that any air is displaced through the pressure washer. Continue in this manner through the HP hose. Shut off the water and connect the gun. Turn the hose back on, and operate the gun for several minutes, pulling the trigger and releasing. This alternately allows the water pressure to build up on house pressure and then to depressure, pulling residual air from the system. Release the trigger, and start the machine. Usually, this is enough to get full washing pressure. If it is very difficult to start, you can hold the trigger down on the gun and pull the start cord at the same time. Holding the trigger down acts as an unloader, making the starting easier.
Hope that this helps, --W/D-- please feel free to rate this solution! Thanx!

Jul 31, 2009 | Garden

1 Answer

2-yr old troy-bilt pressure washer with honda gcv160 engine. seems to run well, but when trigger is pulled get full pressure for less than 5 seconds before reducing to house water pressure. when left...


It sounds like an air lock. Try this: With the machine off, connect the hose to the washer and let it run for several minutes to get all of the air out of the hose, and to purge any air out of the pump. Shut off the water, and connect the high pressure hose, but not the gun. Let the water run for several minutes. stretch out the HP hose and make sure that the air is displaced. Shut off the water, connect the gun, and purge as before. Now crank it washer up. As quickly as safe to do so, open the trigger to keep water moving through the washer. It should come up on pressure very quickly. It is better during normal operation to keep water moving through the system. When I am through for a while, I shut down my washer, but leave the trigger depressed to allow the pump to stay full of water, and cool. This prevents further problems when I restart it.
Hope this was useful.

Regards --W/D--

Jul 17, 2009 | Briggs & Stratton Garden

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