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Maybe A cilinderseal exacly on top of the cilinder is insecure loose on the top instead of tight , it look likes he is blowing air out by the trigger instead to drive the piston . the most types airnalers have a valve insite the top of the top cover this may also be cleaned (solvent) and so that the parts can move free inside.
Remove the nails and take off the trigger to expose the trigger valve (usually part # tva6). Connect air and spray soapy water on the valve to determine if the air is leaking from the center of the valve or around the outer edge between the body and valve. If leaking from the center, could be defective valve or debris under oring. Pop out the valve and examine internal parts for cut oring or defect. If leaking from between body, you could have cut orings installing the valve. Make sure that there are no rough edges in the body of the gun. Bump fire or single fire happens with the trigger type not the valve. Bump fire trigger is usually black metal and single fire trigger is light color plastic. Good luck
firstly its always better to change both of the bands even if one is broken this always keeps the drive trim.all seems well clean all the contacts ie battery and gun (do not use any cleaning products this will cause grease)just wipe clean with paper towel.
May need cylinder seal # bc0438. When this seal fits loose or is cracked, air will leak past and push piston down to bottom of the cylinder. If the seal fits snuggly and looks in good order, suspect headvalve orings and cylinder spacer orings leaking. Order oring kit and seal. Use silicone paste lube on all the orings. Look carefully at the surfaces where orings make contact and remove scratches with 300 grit sandpaper(fine scratches will allow air to leak past new orings). To make the gun work with poor fitting orings. Clean inside of gun with diesel and apply plenty of silicone paste to orings (using same orings if not cut or broken). If gun works as normal, the silicone paste is temporarly sealing the orings. It may continue to work for a while untill you get new parts. Good luck with repair.
Remove the brads from your gun - disconnect from the air supply On the front of your gun is a latch - open it Check the sliding surface for build up of dirt or small pieces of metal from the brads. Once clean polish the surface with a fine steel wool or a small brass brush Reassemble with a drop of machine oil on the sliding surface Oil your gun as you normally would Using a piece of soft wood dry fire the gun 10 or so times to ensure that the dents it is making in the wood are all pretty even Reload and nail something
Your air pressure is dropping everytime you fire. It sound like your compressor is not cutting back in untill it to low. Not giving your tool enough continuess pressure. Your compressor cut in pressure should be around 90-100psi no less. and your max. pressure no more then 120psi. (Make sure your regulator is set at 110psi)
Make sure your air is regulated down to the right pressure ( usually 80lbs. ) also there is a way to staple without double firing and that is to hold finger on trigger and tap gun like a hammer but a lot lighter.You can also adjust the safety on the nose of the gun. I believe there is a screw on the front side to loosen and adjust the safety. As far as the manual, just go on their website and get on to download, because they are free always.
Stuart - this sounds like an air problem - you should perform the following test. With the air nailer close to the compressor you must monitor the airpressure after the gun fires. it sounds like the air is not gettting through diapram fast enough or there is a blockage in line. Blockage in line is not suspected for the following reason . It sounds like the air hose is holding enough air to fire 2-4 nails and then you must wait for the line to fill up again and then it fires ok. The pressure regulator out to the line controls this and they do fail. try this test and report back to me - I know I can solve this for you as I have extensive background in compressor and the like.