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Crosman Pumpmaster 760

I have a crosman Pumpmaster 760 that I've own for the last 33 years. It won't pump up pressure anymore. I've had it apart and the only thing I can figure out is it must be in the valve tube, but I can't seem to remove the valve to inspect it. I don't want to force it and break anything because I want to keep it as original as possible. It has never and I mean NEVER had any repairs done on it ! How do I remove the valve assembly from the valve tube?

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Hi I had the same problem and I fixed it by just simply pumping the gun at a faster rate. For some reason when I pumped it slowly air would leak out and no pressure would build up similar to your problem, but when I started to pump it rapidly pressure would build up. Though this little fix works I might just exchange mine because I don't think the gun should have this problem.

Posted on Jan 03, 2012

  • tesdavida Jan 03, 2012

    You also must have a bb or pellet loaded to make it work, but remember to stay on safety while pumping.

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Hit it with a hammer 4 to 5 times...
then go buy a new one... their $33 bucks at frickin walmart...

Posted on Jan 29, 2009

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