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

July 17 2009 at 10:21 AM
  (Login 375RoundBall)
Crosman Forum Member
from IP address 190.149.112.228

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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(Login jpsaxnc)
Crosman Forum Member
98.26.157.248

Hi Daniel, yes the pump cup can be replaced, but requiers some special tooling,

July 17 2009, 10:48 AM 

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.

 
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(Login 375RoundBall)
Crosman Forum Member
190.149.118.38

Do you know someone that makes this change of seals?

July 17 2009, 11:08 AM 


 
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(Login jpsaxnc)
Crosman Forum Member
98.26.157.248

Tim, at Mac-1 airguns. n/t

July 17 2009, 11:36 AM 

n/t

 
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Garrett in STL
(Login gmany)
Crosman Forum Member
70.253.190.89

You can send it to Alan at AB Airguns in KS, or if a buddy has a small press

July 17 2009, 3:53 PM 

do it yourself with the instructions on his website.


 
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(Login tripleguy)
Crosman Forum Member
72.135.249.99

I've done a bunch of those

July 17 2009, 8:30 PM 

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:
[linked image]
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."

 
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(Login 375RoundBall)
Crosman Forum Member
190.148.6.59

I tried but I failed...

July 20 2009, 8:29 AM 

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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