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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If gun firing but nails not being driven could be one of two basic problems:
1. Nail jammed in magazine not allowing nails to move up.
Empty magazine, does follower move to top of magazine. Push gun against work piece, does fan motor start? Yes - jam in magazine or lock out bar not operating. (this would allow nail un to fire when out of nails)
2. Piston/driver not returning fully after firing, hence driver blade on top of next nail instead of behind it. This could again be caused by a jammed nail or just a nail head. Another case of not returning is the combustion chamber not making a good seal, check O rings on framer (they are steel rings on bradders) it may just need a good clean it is surprising how dirty they can get and if not cleaned a build up of dirt could break a seal. If not been cleaned for a long time worth checking piston rings, worst case scenario dirt builds up around the rings and stick fully in requiring new piston if the rings will not come out.
Nail guns work on the principle that an explosion pushes the piston driver forcing a nail into the work piece, after the explosion a vacuum is created and it is this that 'sucks' the piston/driver back up the cylinder.
Hi... mine had the same problem when I bought it cheap second-hand. I made a spacer out of a washer that slips over the gas stem adapter and so far 100% fire rate. It holds the adapter closer to the cartridge nozzle and opens the valve that releases the gas when the trigger is pulled. Too easy! Good luck.
There are two issues that people have with nailers that sound the same however are totally different. Firing more that one nail at a time can be taken as; two nails being driven with one fire or the nailer vary rapidly firing a second time almost instantly after firing the first nail and each time only drive one nail. Problem of double fire (either type) is very common with nailers (the gun very quickly fires twice), however two nails at once can only happen if the wrong gauge nails are used in the gun. A 15 g nailer can very easily pass two 18 g nails or, with more difficulty, pass two 16g nails. To help prevent the driver blade from hitting two nail heads at once, most drivers are slightly tapered at the tip so that the driver will hit the first nail and the tapered part will push the other nails back into the rails slightly. Remove the head of the nailer and pull out the driver. Measure or compare the thickness of the driver to the thickness of the nail head. If you are sure that you are using 15 gauge nails, check the driver for taper. The tapered part should face the rails. If not tapered, try carefully grinding a taper keeping the tip cool so that you do not effect the hardness. You could also check for other brands of 15 g nails with slightly more spacing between the nails. There is a big difference in quality among brands of nails. Good luck with your repair
could be a few problems, the feed piston might be sluggish, the spring might be missing off the feed pawl, the collation of the nails or a bad coil of nails, the driver might not be retracting fully. Now for the way to check some of these. First look at the coil of nails and the adjustment on the magazine, the nails should pull freely off the coil. Next remove all the nails and using a block of wood "dry FIRE" the tool with the feed door open to check the movement of the feed piston, it should snap back and forth and if it doesn't that would probably be your problem, could be dirty/worn orings or debris in the air chamber. UNPLUG air hose and check for the finger spring that holds the feed pawl tight and check the pawls for wear and asphalt not allowing it to catch the nails. Lastly fire the tool and check the piston, did it retract fully allowing the next nail to advance? if not you would need to probably replace the o rings in this tool. Let me know if you need more assistance. And if I have helped you would you please vote accordingly, thanks
remove all the nails and remove the air hose. BUMP the tool on something and does the driver come down on its own if so it needs new o rings. also take a look at the feed pawl for a broken spring that would prevent it from feeding nails and lastly look at the coil of nails to make sure they pull freely. Let me know if you need more assistance.
Sounds like the trigger o-ring is damaged, either because of not being oiled frequently, or the pneumatic tool has not been used for a while. O-rings will harden up if not used. Look for a place that sells fasteners, or nails and see if they can put a new o-ring in the trigger asm. for you. If you take the gun to a place where you purchase your nails, they should repair for little or no cost. it is an easy repair if you have the tools, parts, etc.
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
Professional-grade varieties are automatic, and fire a nail directly upon pulling the trigger. A semi-automatic nail gun is more appropriate for beginners, since it requires a two step process: pull the trigger and then tap the barrel against the wood. This safety feature protects the user from accidentally firing a nail gun and injuring himself or others.