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Most likely stuck trigger valve. Easy to check. Remove nails, remove trigger to expose the firing pin of trigger valve. Connect air and very quickly depress the firing pin all the way in. If the gun fires , adjust the safety to depress the trigger valve completely. If the gun does not fire, replace firing valve, or remove and check /lube o-rings in valve. Good luck
nozzle head might be shut try turning it to open, you should here air coming out if air comes out but no paint comes out then paint is to thick and might need thinning, hope it helps.
ok, start with checking gas delivery ,then with total clean. If still malfunction, check the setting of lower probe(part 66). I've owned my guns for 11 years and do all my own servicing. Most if not nearly all problems are caused by dirty components...cheers
When the driver or headvalve is stuck in place and the gun is fired, there will be a pop sound or the sound of air being released within the gun and at the trigger. Remove the nails and air supply insert metal rod into nose of gun forcing the driver against headvalve (a couple of firm taps will do). Retest gun. If no joy, remove the head being carefull with head gasket. The driver should be at the top positon (if driver drops to bottom of cylinder replace oring). Pull the driver and lube the piston oring seal. Headvalve should move in with thumb pressure, if stuck, remove and clean / lube orings. Replace parts as needed if scratched, cracked or generally worn. Use plenty of silicone paste lube on orings ( sold at Lowes in the plumbing department and swimming pool supply stores). Good luck
One or more of the rubber o-rings inside the gun are worn or broken. Air is leaking out of where it needs to go to push the driver back up. This is a good gun and worth rebuilding. Unfortunately Hitachi doesn't make rebuild kits for their guns, you have to have a breakdown and order each part you need seperately. If you do this, replace all of the o-rings, if one went bad the others are not far behind. If you take it to a repair shop make sure they repalce all the o-rings.
Porter cable makes a number of brad nailers (18 gauge) that very quickly suffer from the problem that you are having. You did not mention the model number of your gun but if it is one of these, (bn125a, bn200a, ns100a) kit # 60061 will fix the problem. It costs between 25 and 30 dollars. Google that part number or order from www.dewalt.com. Dewaltowns the porter cable brand. Before you order the kit, check that the driver blade is not bent and stuck. The driver should travel freely down the cylinder. When you install parts, use Danco silicone grease to lube (availabel at Lowes in the plumbing department) If your model # is different from those mentioned above, please email me and I will recommend a repair.
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