I can't get the Makita AN901 to fire nails consistently
We have taken delivery of two AN901 coil nails and are using them with a 2.5" annular ring shank grade 316 stainless steel nail. We can not get the gun to fire the nails in consistently.
In essence the gun fires the first nail in more or less to the correct depth then the next few nails are only part fired home, in some cases it will not fire a nail and the piston comes out and strikes the wood. When the nail is fired in the piston leaves a mark in the board, occasionally the wood is also splitting when the nail is fired fully in.
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The reason is that you are allowing the nail to "push" you off the wood when the tool fires. Probably you're using a very hard wood with a ring shank (Annular) nail. The best way of overcoming this is to push just a little bit harder down onto the tool before firing.
We see this quite often when people are just starting out with these tools, don't worry though, it gets better with practice!
The firing pin can be completed or part of it crooked worn and can have a little burr on its way and stuck in the cylinder somewhere o-rings worn and hardened, have a tilting piston on the firing pin somewhere in the cilinder
Nailers that use strips of nails (one nail directly behind the other) will sometimes drive two nails at once and is caused by damage to the driver. The nails are so close together that the driver will hit the first and part of the second nail head. Coil nailers, as your an451, use nails seperated by welded wire making it very difficult the the driver to hit the second nail. Usually when a coil nailer shoots two nails, it is acutally the trigger valve that acutates twice (two very rapid fires). Two very rapid fires is caused by faulty trigger valve. I have seen a roofing coil nailer fire one nail and a second nail drops out of the gun. Caused by weak / malfunction of nail feeder or wire used to weld nails together is too thick.
could be a couple problems. First are you using the right collation nails and do you have the tray set for the nail length. Second, remove all the nails and open up the feed door and check to see if the spring is still on the feed pawl. Then what I would do is get a block of wood and dry fire the tool lookng for the feed pistion to snap back and forth freely, if it moves slowly could be an o ring that is dry or something got into the air passage causing this. Let me know if you need more assistance.
I found the solution to the double shooting happens when the retainer ring on the feeder paw inside half of the coil nail holder. Part #92 (962112-6) retainer ring R-22. I found the clips broken in two of my guns. Now they work great.
you need to punch these nails through... unless there are thousands surely this is better than a plug cutter? i'd get a nice cheap phillips screwdriver and bust off the resin handle to make a decent large blunt punch.
not too familiar with makita brand nailers but jams are usually caused by cheap nails but I see you have tried senco brand which is a good brand sounds like a mfg defect try using hitachi brand nailers they are good