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Why does air tool blow air without driving

Good air pressure but triggering tool simply bypasses air without driver action

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Either you have lubricated the head instead of the air inlet end or you have worn out the little ball bearings in the head. The drive head only needs a dap of light grease bi annually or when being repaired. The air inlet end needs oil drops daily or every time you use it. Once the two little ball bearings in the head have flat spotted they are worn out and need replaced.

Posted on Feb 18, 2013

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Posted on Jan 02, 2017

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1 Answer

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there is an oring that has split on the trigger valve and you would need to replace the valve assembly. Without knowing which tool you have I can't give you a part number but if you look in the tip section I have detailed instructions on how to remove and replace this valve. If you give me the model I will try and find you a source and part number for your nailer. Let me know if I can be of more help or if you have trouble finding the instructions.

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I have the 2 1/2 Hitachi for nailing siding. The nail gun had not been used for a couple of years, but now will only drive the nail half way in. Sounds like an air leak when driving the nail. I have...


Remove the nails and air supply. With side door open notice position of driver. Driver should be at top position with tip not visible. If driver is down and it moves within cylinder when you tilt nose up then down again, time to replace orings. If driver is down, it should extend past the nose about 1/4 inch (if driver is broken at the tip the end will look rough and nail will not drive in all the way). If driver extends past the nose more than 1/4 inch then lower bumper may be breaking up /cracked. Easy test for proper function. With nails removed and side door open, connect air to gun and dry fire gun against hard rubber or old coiled air-hose (with air connected and trigger depressed, no air should leak from trigger area, if air leaks when trigger is depressed, look for fault at trigger pin). Feeder should move back then forward in quick motion almost matching speed of driver and driver should not creep down between shots. No air should leak from nose of the gun (push nose against hard rubber and depress trigger and hold in this position, driver should stay down with very little or no air leaking out of nose, when you release trigger, driver will return). If air leaks out of nose while holding in this position, replace lower bumper. If a quantity of air leaks from valve in front of trigger, cylinder orings may need replacing or outer part of cylinder has fine scratches (remove scratches with 400 grit paper). Parts are available at www.toolpartsdirect.com. Good lucki

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1 Answer

No air on tools side


Hi, Between the two gauges is the regulator adjusting knob. Turn this until you see the pressure rise on the tool side gauge. You can also test for a rise in pressure in the air hose by connecting a blow gun, and pressing the trigger as you make adjustments. If you cannot raise the pressure with the regulator, it is probably bad.
Best regards, --W/D--

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1 Answer

No air pressure at the hose


It sounds like you have trouble with your pressure regulator. Make sure that the knob for the regulator is turned clockwise to increase pressure. If this doesn't work, you may need to replace the regulator.

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2 Answers

The motor is pulsing on and off without the trigger being pressed


It is probably sucking air on one of the connections or around one of the fittings at the regulator. You can also turn the pressure up allittle on the regulator, that might stop it also. Make sure the clamps on the hoses going to the regulator is tite. Also it could be that the regulator is just bypassing water and if it has air in it it will pulsate.

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