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Leak around trigger could be trigger valve internal orings or orings on the outside of the trigger valve making contact against the body of the gun. Spray soapy water to determine where the air is leaking from. If air is leaking around the outside of the valve, most likely the orings were cut upon installation of the valve. If leaking from internal valve, most likely worn or broken oring; easy to fix if you have a source for orings.
To remove the trigger valve for service or inspection (take close-up photo of trigger area for reference ): disconnect airline, remove nails, remove trigger retainer pin, remove trigger, remove roll pin /s holding trigger valve in place (use 3mm punch to remove retainer roll pins which are located in the body of the gun just above the trigger valve). With retainer pin/s removed and with gloved hand (under trigger valve), apply air pressure to gun to blow out the trigger valve (use lower pressure to push out trigger valve because it could come out with force.). With trigger valve in hand notice that there are two slots or groove cut neer top of the valve where the retainer pins rest, you will need to reinstall valve into body with slots aligned to retainer pins. Remove retainer pins holding trigger together to pull out internal valve. Good luck and post again if your have other question about the trigger valve.
As the contact arm and trigger inner lever wear, the trigger will not push the trigger valve pin all the way in. The pin on the trigger valve also wears. One deficiency or a combination the three problem areas is causing the problem. Remove the trigger and look carefully at the inner lever (thin metal part ). If it looks rather worn and the trigger itself fits loose on the retaining pin, replace with new. Replace the trigger valve if the center pin seems loose in the valve and looks like it has worn shorter. ;Good luck.
has a new trigger valve to replace the original (part number
5140095-73). Not sure if the new valve is replacement to address an
issue or natural progression. I would also replace the orings that make
contact with the reference #55 on parts list called the bulkhead.
There are four orings contacting the bulkhead that wear and may
contribute to multi-fire or miss. Finally, look for worn parts that contact the trigger. The safety foot pushes up on the inner part of trigger then pushes on the firing valve pin. If safety mech parts are worn or trigger is worn, the gun may miss. Parts are at dewalt service center or at
www.toolpartsdirect.com Good luck
Worn trigger and or worn firing valve. Remove the trigger and look for wear on contact surfaces (worn pin that holds trigger, worn inner lever inside trigger, worn or loose firing pin in valve ). Easy test for worn trigger. Remove the nails, remove trigger, fire the gun against wood with finger to test for proper action. If it works better without trigger, consider replacing trigger with new (I would also order the oring repair kit that includes the firing valve )
Remove roll pin holding trigger. Examine trigger for wear. A loose/ worn trigger can cause problem that you describe. Also examine the roll pin that holds trigger, if it is worn where trigger rides replace pin. If trigger and roll pin look ok then problem most likely tva6 valve. This valve has a pin that wears out. Order from ebay for under $20.00. If the gun leaks air, remove head and clean orings in the headvalve. Pull cylinder and clean orings to cylinder seal. Remove fine scratches on body of gun where orings contact metal. Use 400 grit paper. Lube all orings with silicone paste (sold at lowes in the plumbing department for faucet orings). To remove tva6 valve remove two pins in body of gun and apply air pressure to pop out valve. Use glove when you catch tva6. Use caution because the valve can come out with force (lower pressure ). Good luck
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
Thy this simple test. Remove nails and remove the trigger exposing the trigger valve. Connect air to gun and place the nose of gun against hard rubber or wood and push in the trigger valve pin all the way very quickly with finger. If the gun fires then the safety and trigger mech. are not pushing the trigger valve pin all the way in. Look for other worn parts or adjust safety to allow for more travel into trigger pin. If the gun will not fire then problem most likely in headvalve orings. Look for fine scratches on surface where orings contact. Remove fine scratches with 400 grit paper, lube with silicone paste and re-test. Good Luck!
I have repaird hundreds of nail guns with a problem similar to yours. Depending on the brand and model, the problem can be repaired by checking the following. Headvalve orings should be checked for wear and any surface that the orings contact must be smooth and free from scratches. If the surfaces are scratched try to smooth with fine sandpaper and use light grease instead of oil when assembling. The safety contact foot may not be reaching high enough into the trigger to properly push in the trigger button. Check for worn spots on the trigger that may be filled in with epoxy, loose fitting trigger caused by worn roll pin or retaining pin. Some of the trigger valves as used on many bostitch nailers (tva6 valve) used a plastic pin which contacts the trigger. If this pin is loose or worn the valve should be replaced. Some tva6 valves have a vinyl looking sort of oring that fits too loose on the spool. This vinyl oring in not available by itself but if the oring fits too loose the gun will not fire and leak air. On bostitch remove the trigger and the rollpins holding the trigger valve and apply air to gun to eject valve. (use heavy glove to catch valve as it will come out with force)
pressure washers has this pressure switches where in as you press on the trigger, the washer works and if you release it, the pressure would build up high and it would trip this switch to turn off the motor or deflect the water to the by pass hose ( if the motor is not stopping) then as you press again the trigger, water should come out of the gun again but would not,
i have encountered the problem is in the pressure switch, even the pressure went down, sometimes it wont close the contact then the motor wont run ,
if the motor is continously running, then the trigger switch is the problem, the pressure excerted on the switch is so high that even if you press it , it won't open up to release the water.
what i can suggest is to tie the trigger in the gun so that it is always pressed and then just unplug the unit if you want to stop using it. it is an inconvenience but it will work.
or, open the gun and see if you can figure out why pressing the trigger would not open the switch.
another option is you can lower the pressure of the washer if it has an adjustable pessure controller. by lowering the pressure might open the switch when ever you press the trigger.