Milwaukee Tool Milwaukee 7120 - 21 Coil Roofing Nailer "nail gun piston retracting" Questions

...gun against wood/rubber and hold in this position. Piston should stay down and no air should leak past nose. Worn piston oring, piston should not slide down cylinder under its own weight. Loose or ...

...nail gets shot. Please let me know how to repair this problem. Thanks. The check seal is what causes the piston to retract. Remove cylinder and examine check seal. It is a small band that covers a ...

...nail, replace the driver oring and retest. If driver is up all the way, remove nails, reconnect airline, leave latch open and fire gun against rubber (old tire or coiled up waterhose/airhose) this ...

...nail gun jams when a nail is shot, the drive piston does not retract back far enough to let the next nail slide forward causing a jam. I have to push the drive piston back with a rod to let the next ...

gun and the piston should retract. If air leaks from bottom while holding in this manner, lower bumper is not sealing, if air leaks from top, then upper bumper is allowing air to leak from head valve.

...Nail feeder on this gun is both air and spring controlled. Air pressure retracts the feeder and a strong spring pushes the feeder back to front. Remove nails and leave side door open. Dry fire gun ...

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

...nail. If I turn the gun upside down and tap lightly on the head it will usually allow the striker to retract.There are no air leaks you have lost compression on your piston o ring, instead of air ...

...nail feed pawl area.  Cleaning off this buildup will usually take care of most problems with roofing nailers.On the side of the gun away from the side you load the nails on there is a small ...

...gun. If driver stays  all  the way down, pull cylinder and make sure check seal is in place. If driver goes partially up, oring too tight/loose, lube piston seal with white grease or ...