Question about Stanley Bostitch Rn45b1 Industrial Coil Roofing Nailer

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RN45B secquentail trip will not work; contract trip will work only when slam hard on work. I do not know what to replace. small air leak .Can you help?

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Remove roll pin holding trigger. Examine trigger for wear. A loose/ worn trigger can cause problem that you describe. Also examine the roll pin that holds trigger, if it is worn where trigger rides replace pin. If trigger and roll pin look ok then problem most likely tva6 valve. This valve has a pin that wears out. Order from ebay for under $20.00. If the gun leaks air, remove head and clean orings in the headvalve. Pull cylinder and clean orings to cylinder seal. Remove fine scratches on body of gun where orings contact metal. Use 400 grit paper. Lube all orings with silicone paste (sold at lowes in the plumbing department for faucet orings). To remove tva6 valve remove two pins in body of gun and apply air pressure to pop out valve. Use glove when you catch tva6. Use caution because the valve can come out with force (lower pressure ). Good luck

Posted on Nov 08, 2010


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Your nailer uses a trigger valve (part # tva6 cost about $20) and is sold at or generic valves sold on ebay . If you have a source for orings, you could try to repair the valve. Remove the roll pin that holds the trigger to expose the tva6 valve. There are roll pin/pins that hold the valve in just above the valve in the body. Remove these pins and apply air pressure to gun to pop-out the valve. Use caution when you do this. Remove nails, lower pressure to gun and use glove or rag to catch valve because it could come out with force. With tva6 valve in hand remove two pins that hold valve together and remove inner plunger. The middle oring on plunger is cause of leak. Try using an oring about same size as the broken seat. It must fit pretty tight to work. If you had a small leak it could be that the firing pin orings fit too loose or just too worn. Use silicone lube or oring lube on the orings and the valve port. Good holidays.

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