Its possible to fix the pump cup of a Crosman 140/1400?

Its possible to fix the pump cup of a Crosman 140/1400?

Joined: December 16th, 2008, 10:08 pm

July 17th, 2009, 4:21 pm #1

I just get a nice crosman 140. I just finished resealing it but the pump cup is very hard, feel more than plastic than rubber. It pumps the first or second time, but at the third It starts to fail.

Its posible to get a new rubber cup and change it or I need to change the complete part?

Thanks

Daniel.
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Joined: June 25th, 2002, 1:34 pm

July 17th, 2009, 4:48 pm #2

I would send it to someone with experience in replacing these. I changed one out myself, and got it on right, but the gun did not pump right afterwards, the rubber piston was dragging badly for some reason. hth.
Last edited by jpsaxnc on July 17th, 2009, 4:50 pm, edited 1 time in total.
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Joined: December 16th, 2008, 10:08 pm

July 17th, 2009, 5:08 pm #3

Do you know someone that makes this change of seals?
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Joined: June 25th, 2002, 1:34 pm

July 17th, 2009, 5:36 pm #4

n/t
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Joined: February 4th, 2006, 8:11 pm

July 17th, 2009, 9:53 pm #5

I just get a nice crosman 140. I just finished resealing it but the pump cup is very hard, feel more than plastic than rubber. It pumps the first or second time, but at the third It starts to fail.

Its posible to get a new rubber cup and change it or I need to change the complete part?

Thanks

Daniel.
do it yourself with the instructions on his website.

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Joined: May 17th, 2004, 4:36 pm

July 18th, 2009, 2:30 am #6

I just get a nice crosman 140. I just finished resealing it but the pump cup is very hard, feel more than plastic than rubber. It pumps the first or second time, but at the third It starts to fail.

Its posible to get a new rubber cup and change it or I need to change the complete part?

Thanks

Daniel.
If you've got the piston out, take a razor knife (box cutter) with a fresh blade and carefully cut away the old seal. It's held on by being sandwiched between the back of the piston and the brass retaining bushing. Carefully cut away the material that's sandwiched in there - your goal is to get a thin, flat blade screwdriver in there. If you do, use some leverage and get the space just a bit wider in order to insert this tool that you will make from a washer:

When you get that washer on there, you can open a vise so the pump rod clears the jaws and the washer supports the piece. Then, tap the top of the pump rod and the brass retaining bushing will back off. Install the new cup and tap the retaining bushing back on.

"but I'll be needin' that gun, fer squirrels and such."
Last edited by tripleguy on July 18th, 2009, 2:32 am, edited 1 time in total.
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Joined: December 16th, 2008, 10:08 pm

July 20th, 2009, 2:29 pm #7

Thanks for the tip, but I must have done something wrong, because I couldn´t get the brass part out. I make a lot of pression but it doesn´t move.

Daniel.
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