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i think you have two different problems , replace the feeder spring, and replace the oring on the driver piston. also make sure that the coil of nails is perfectly round if they are dropped or squeezed tool will not work right
The bostitch nailer pictured along along with your question is a RN46 roofing coil nailer. It has a dial on the front of the nose for adjusting depth. Some older nailers (roofing nailers) do no have a means of adjusting so were set at the factory for best performance. The question of depth usually comes up when lower bumper fails and the nail is driven too deep. Easy test. Remove nails and find a very soft piece of wood. Dry fire the gun against soft wood and measure how deep the driver is entering the wood. Harder test. Remove the head and use any handy tool to push driver down to bottom. Measure how far the driver extends past nose (should be about 1/8 to 3/16). If more, replace the lower bumper. Good luck
Best place for replacement parts is the address below. Ez to order from and usually only takes 10 to 14 days to get the parts. Click on Hitachi logo then select coil nailers, then your model number. For local parts, look in the yellow page directory for fasteners. Fastener companies that sell nails and other supplies to contractors also have parts for Hitachi nailers. Check with several. Some will even repair the nailer for you if you buy nails from them. Good luck.
I recommend you go to an online retailer like Amazon.com. Search for "electric roofing nailer", or just "electric nailer" and see what you find. Amazon.com is good source for tool specifications and customer reviews. You don't have to buy from Amazon, but its a good place to research what's out there.
I can tell you one thing...electric (corded) nailers that shoot a nail of that size are uncommon. If you're looking for an alternative to pneumatic, other options include gas-driven (takes a small gas canister - usually a butane mix)...a common brand for this is Paslode. Another option is a cordless battery nailer - I believe Bostitch makes a cordless roofing nailer.
Either the nail thingy that pushes the nails through is worn, broke, or shot, or you have the wrong nails in there and it is not grabbing them as it should, I think the part is broken on the inside, can't really tell without seeing it, but if it spins free, you need to check it out. Might be able to weld it. Or just replace it. Hope this helps.
There are some adjustment But for safety reason's it could also be dried or sticky safety switch ,you could try setting or oiling it, But should probably let the certified repair shop do the job, that may alleviate you of some liability . hope this helps .
When this happens it is most likely the piston has untreaded itself from the piston stem. This will cause the piston to hit the bumper before it drives the nail all the way down. You must dismantle the tool and tighten this piston up. Or take it to your nearest Bosttich service center its a pretty quick fix.