Question about Stanley Bostitch N88rh Framing Nailer Driver Piston 158582

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Stanley Bostitch N89C-Piston will not retract. Forgot to oil today-used ,yesterday and today, perhaps 200 nails. If I have to disassemble do I open from top or bottom?

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  • Stanley Master
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Lack of oil usually will not prevent driver from retracting (bent driver /debris / worn piston oring / cracked lower bumper / loose check valve ) . Remove nails and push driver up. It should not require much force to move driver / nor be so easy that driver fall back down under its own weight. If driver feels loose, replace piston oring. If it feels about right, most likely problem is the check valve. Remove head and pull cylinder. Look for band around cylinder covering series of holes. It should fit snuggly. If loose replace with new part or use any rubber available or series or orings to fit space. If check seal looks ok then examine lower bumper for missing pieces or cracked. Lube with silicone paste lube sold at Lowes. Parts are available at www.toolpartsdirect.com . Good holidays

Posted on Dec 29, 2010

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