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Piston does not return after shooting - Tools & Hardware - Others

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What make? could be an air leak or the the piston cylinder is dry. Need more info.

Posted on Jan 06, 2013

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Posted on Jan 02, 2017

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Why wont my hatachi nail gun shoot 1 3/16 nail all the time


Has the tool been lubricated properly to Hitachi's recommendation? Is the airline pressure running about 90-100 psi? If not try giving it more pressure. Sometimes the compressor may have too smaller receiver (Tank) for what you are trying to use it for, leaving the tool unable to return the piston/driver to top dead centre.

Sep 13, 2014 | Tools & Hardware - Others

1 Answer

Driver not return


How old is the nailer. If it is old enough and not oiled each use, O rings get damaged and will leak air at piston and trigger valve. Depending on the brand a rebuild kit may be available with new O rings and trigger valve.

Jan 14, 2014 | Hitachi Tools & Hardware - Others

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DOESN'T FEED,IT MIGHT MISS SHOOT A TIME OR TWO THEN GET A NAIL THEN NOT FEED.I'M SHOOTING A 1.5"TECO NAIL. ANOTHER GUN DOESN'T SHOOT EVERY TIME LIKE THE DEPRESSOR ISN'T LETTING THE...


Usually miss feed happens when the driver does not return to top position not allowing the nails to feed into position. Easy to check, point nose of nailer up then down again to see if the driver is loose in the cylinder. If loose, the driver will be in the down position when the side door is opened. If driver is down, replace driver oring. If driver oring is good, look for spring tension on feeder and check feeder spring on the door side. If piston oring good and feeders have good spring tension, suspect lower bumper cracked(remove head and piston to check bumper).
On gun with depressor (safty foot) not actuating trigger, look for worn trigger (trigger inner lever could be worn) or loose or worn firing pin in the trigger valve above the trigger(valve # tva6). Replace as needed. To check for proper gun action, remove the nails, remove the 3mm roll pin holding trigger and dry fire the gun by depressing the tigger pin. Good luck

Sep 21, 2011 | Stanley Bostitch Coil Framing Nailer

1 Answer

My bostich1664FN was working fine,then it stopped shooting nails.How can I troubleshoot this problem. Thanks John


Here are some easy tests.
Assuming that the gun is firing normally however no nails are ejected. Remove the head of the gun and check if the piston is not returning to top of cylinder (piston needs to return to top for nail to enter into positon under the driver). Piston not returning to top indicates, bent driver or worn oring on piston. Repair /replace as needed. If driver/oring looks good, pull out the cylinder and look for check band in place around series of holes on lower part of cylinder and bumper should not be cracked. Lube all orings with silicone paste lube. Good luck

Sep 06, 2011 | Stanley Bostitch SB1664FN 16 Gauge...

1 Answer

The piston will not return to the top after shooting


I assume you are talking about a air nailer,when the piston doesn't return it is usually a broken driver or a jamb in the nose piece. Hope this helps, if so give us a 4 thumbs up. THANKS

Mar 16, 2011 | Garden

1 Answer

Not firing right


the nail return spring for the piston is stuck or broken,dis mantle the gun and clean and check the spring to see if its broken

Apr 06, 2010 | RTO PasLode 900420 Impulse Framing Nailer

1 Answer

My finish nailer will not shoot fireing plunger does not go back up when fired


The driver attaches to a piston. If the driver has broken it will not return up it is either broken off the piston or an o-ring has went bad around the cylinder. After firing these o-rings direct a shot of air under the pist so it moves back up. What make of gun do you have?

Nov 17, 2009 | Senco Tools & Hardware - Others

2 Answers

My brad nailer will not shoot any nails. When I press the trigger, I can hear a small puff of air.


it sounds like the piston/driver might be stuck or the firing valve is malfunctioning. there are 4 screws to remove the top cap and you can see if the driver is damaged. Also before removing check to make sure there is not a nail jammed in the nose assembly. This tool is good for breaking the pin on the piston.

Oct 16, 2009 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

1 Answer

Nail would not shoot out


The problem that you describe is caused when the driver is not returning all the way back up to the top of the cylinder not allowing the nails to enter into position . You may have one of several problems including worn piston oring, bent driver, worn check valve, worn lower bumper, or low air pressure. Simple test is to manually push the driver blade back to top using a thin piece of metal that fits into bottom of gun. Be sure to disconnect from air supply when doing this. Good Luck

Jan 08, 2009 | Stanley Air Tools & Compressors

1 Answer

I have been rebuilding Hitachi nalers for about 2 years now and this one has me stumped. It works fine if you single shoot it. If you hold the trigger and try to bounce shoot the nails, the driver will not...


The roofers that frequent my shop want their nailers to work like machine guns. Here is what I do to make the hitachi 45 nail fast. Remove the cylinder and sand the fine scratches where orings meet cylinder. I use a rubber slug with a small bolt through the center. The rubber slug fits snuggly into the cylinder and the bolt into chuck of drill. Turn the cylinder with the drill while holding fine sandpaper against the scratches untill smooth. remove the nose from body and replace the sheet (part # 877125) and the bumper. If the sheet fits loose on the driver and the bumper has cuts or missing pieces, the driver will not return with full force. also the oring on the piston should not be too tight. Just snug enough to hold the weight of the piston. While nose piece is off check the air passage to feed piston for trash, use a small wire and push through to make sure. Make sure the orings on the feed piston fit snug. Actually push the feed piston by hand in the nose piece to make sure the three orings fit snugly. A loose feed piston will reduce nailing speed. Finally replace the boot on the firing pin. If the boot is blown off its seat with use replace the firing pin. A loose firing pin will waste air and lower pressure reducing nailing speed. Good luck

Dec 01, 2008 | Hitachi NV45AB2S Coil Roofing Nailer

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