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My rn46 roofing nailer quits compresing piston after air pressure has been released. for instace gun will work properly until compresor does not keep up, then gun will not fire even after compressor fills up. if i pull the gun apart and put back together it works until a loss of pressure accurs again.
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The Bostitch rn46 is a very good nailer however suffers from the problem that you are experiencing. Easy to fix. Remove the nails and connect to air pressure (100psi). With side door open and trigger depressed, cycle the gun against old coiled rubber hose or soft wood. As you cycle the gun, check that the feeder is moving back and forward with speed and the driver is moving down then up again. If the feeder seems to move in slow motion back and forth the air passage that feeds air to the feed piston is restricted or oring/spring to feed piston is worn. If the feeder moves very fast then suspect worn driver oring. To check driver oring, remove nails and air supply and leave open side door. Point nose of gun up then down to see if the driver seems loose and is moving up and down the cylinder. When the driver oring is good, the driver will stay at the top of the cylinder. If the driver oring seems ok and the feeder moves very fast then suspect feeder spring weak or missing. I usually find that debris from lower bumper and driver piston oring shavings have entered/clogged the air passage to feed piston. Replace parts as needed. Good luck.
Try adding some transmission fluid to the air inlet. Just a little squirt in the air nipple. Try the gun, if it doesn't work it may need a new o-ring kit. they are relatively easy to replace. Also make sure the allen head screws are tight. These hold the body of the piston assembly against the seals. If air is leaking from this area the gun will not shoot. The seal rebuild kit comes with installation instructions.
The feeder will dislodge if the feed paw spring is weak or missing. Replace with new spring to keep the feeder paw in place. Visual test with good feed spring. Remove nails and open side door. Fire gun rapidly against hard rubber or coiled air hose. The feeder should move back and fourth in time with the piston/driver. If the feeder seems to move in slow motion compared to the driver, check feeder piston orings and feeder piston spring. If both feeder piston orings and spring are in good condition, then check air passage to feeder piston chamber for obstruction. Sometimes debris will lodge in white oring where body mates to nose of gun. Good luck
Here are a few tests for you to try. You will need a piece of rubber or coiled up old hose. First open side door and remove nails. Tilt gun head down then up again to check if piston is loose in the cylinder. The piston should stay in top position. If piston drops to bottom of cylinder replace piston oring or apply some coils of teflon tape under oring to expand oring slightly untill piston stays at top but still can be pushed down cylinder. If piston stays at top connect air to gun and with side door open contact gun to rubber firing gun noticing the feeder movement. With very rapid firing of the gun, the feeder should move back and fourth just as fast as the driver moves. If the feeder seems to move slower than the driver moves then check/replace spring in feeder. If spring seems strong enough in your opinion then problem is restriction in the air supply to feeder. You will need to remove the two 6m allen screws at front of gun and split gun apart to check restriction at the oring sealing these two parts. Sometimes debris traped at oring (white oring) will restrict air to feeder. Good luck.
1) Insufficient air pressure (should be set to around 100PSI)
2) Hitting another nail or other extremely hard surface (old roofs are known for this)
3) Defect in the gun or lack of lubrication.
Since this is a reconditioned unit, I think that the gun is probably fine. Verify that the compressor has the correct pressure and that the hose is large enough in diameter to deliver sufficient air to the gun. Check the CFM (Cubic Feet per Minute) rating of the compressor/tank combo against the requirements of the gun.
The high pressure blew out one or more of your o-rings inside. The drive piston should not move freely in the gun so the o-ring around that is definitely one of them. It's hard to damage the metal and plastic parts of a gun short of dropping one off a roof so rebuilding one by replacing the o-rings is always worth it. You should look for a rebuild kit Part Number: RN46-RK
if u are right nails for gun,then make sure when u put coil in and feed in front of firing pin the nails are straight with pin and connecting wires are not bent causing nails to fall out of alingnment.
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