Lost Velocity- Benjamin Sheridan .22

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A number of years ago, I was given a new Benjamin 22 for shooting grouse while I was deer hunting. For the first two seasons, it worked great on grouse and rabbits. Then, all of a sudden I noticed a severe loss in velocity to the point where I can easily see the pellet flying through the air, and the pellet doesn't even hit a grouse hard enough to stun it.
Does anybody have a fix, or know if there is some sort of rebuild kit available?

Thanks,
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Have you tried posting airgun forum on www.network54.com ,there`s always someone on there that can help and maybe even repair it for you . From my experience it sound like you have a bad seal ,should be easy enough to fix ,have you e mailed Crosman they should be able to help as well .
 
Are you talking about the multi-pump pneumatic? If so, have you been lubing the piston with Crosman pellgunoil? If you dont' the seals dry up over time, although 2 years is not that long. For parts try Eric at www.scopesandammo.com. I've ordered a few items from him in the past and I've been more than happy with the service.

B
 
No don't use pellgunoil, use crosman silicone chamber oil.

Yeah you can buy the rebuild kit, or spend a bit more to retrofit it with a nitro piston.
 
gyppo said:
Are you talking about the multi-pump pneumatic? If so, have you been lubing the piston with Crosman pellgunoil? If you dont' the seals dry up over time, although 2 years is not that long. For parts try Eric at www.scopesandammo.com. I've ordered a few items from him in the past and I've been more than happy with the service. B
Click to expand...

It is the multi pump pneumatic. There is a hole that would appear to be a lubrication point, but it says not to put oil in there (it stamped right onto the pistol)

jzmtl said:
No don't use pellgunoil, use crosman silicone chamber oil.

Yeah you can buy the rebuild kit, or spend a bit more to retrofit it with a nitro piston.
Click to expand...

Where can I find the retrofit kit? scopesandammo.com as well?


Thanks for the replies
 
For a multi-pump you won't find a nitro piston kit. Different animal. You probably need a piston seal and/or a valve seal. Eric at scopesandammo is your best bet for the right parts.
 
Ah okay, I thought you were talking about another model. So yeah google how to replace the seal, it's not hard.

Be aware that scopesandammo charges a high penalty fee if your order don't exceed a certain amount ($25?), and if you choose to use credit card payment there's additional penalty as well.
 
Here is the answer I got from Scopesandammo:

Hello:

Use the Search feature on our website and type in "HB22".


Thank-you.

Http://www.scopesandammo.com

Your Canadian Source.


The only thing they have is a HB22 pistol. Google isn't being very helpful, either. I've searched "Benjamin Sheridan HB22 seal replacement" and "Benjamin Sheridan HB22 Repair"

Any other suggestions?
 
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