Question about Crosman (4032)

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Hello, i have a Crosman 760 Pumpmaster Air Rifle, i got it from my grandfathers basement and it does not hold air pressure, i dont know what year but its the old one with the brass bolt, not plastic. i have a limited knowledge of how the pump mechanism works i was wondering if someone could find a diagram for it or better yet a place that i could buy parts?

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  • Joseph Jun 13, 2010

    Lb-Trice, the advice you gave me was great but i have one small problem, the brass peice with the o-ring on it is sealed in the chamber permanently because the steel tube the peice is in, is knurled as to prevent the brass peice i want from falling out. Any suggestions?

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Sounds like it has a bad o-ring. you can take it apart and replace the o ring for under a dollar. just make sure you look at how it goes back together when you take it apart they are very simple. just make sure the carefully take the right side cover off with the left side of the rifle laying on a table, everything should stay assembled this way so you can look at it. the part you are looking for is in the large chamber that the pump goes into. from the back (the side opposite the pump) remove the spring and the metal piece behind it, then use something the shove the big brass part out of the chamber and the o ring is on the big brass part . take the old o ring to a hardware store to get another one.

Posted on Mar 24, 2010

Testimonial: "Thanks! i didnt know anything about this before and now everything so much clearer. Thanks Again! Joe."

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I dry shot my 760 a few times and now it pumps about half way then releases all the air.. I have it all dissembled right now but nothing looks broken and the seals are all fine because it is not old so is it just a bad valve?

Posted on Jan 29, 2014

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Posted on Jan 02, 2017

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Been sitting for a year, it willnot hold air to shoot, I pump it up 10--12 pumps it won't shoot


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www.crosman.com/pdf/manuals/C760-OM1.pdf
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Can you see through the barrel? Or run a rod down the bore? It sounds like the BB is either falling out the end of the barrel or the BBs are getting jammed up in there. Do not hold your hand in front of the barrel to see if any air comes out. You might get stung with 10 BBs. Hope this helps.

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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...

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