I need help with my pcp pump

Hello, I just got into pcp guns about 2 months ago. I bought a Benjamin Maximus and bought a pcp pump along with it. It worked completely fine, until about a week ago it would not pump any air into the gun. I just want to know what could be the problem

Thanks, 

Parker

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Try 3 first, but do check for lubricant on the cylinder.



1. First is there a very thin film of lubricant on the chrome cylinder of the pump?

2. If not a very light application of silicone "grease" at the top of the cylinder and then the next item below.

3. There should be a large brass nut on the bottom of the cylinder the handles are on lightly tighten it (hand tight should be plenty).
 
Here is a thread that may help.

From your description I am guessing that the one-way valve has become a two-way valve either because the O-Ring has failed or something has killed the seal!



https://www.airgunnation.com/topic/benjamin-pump-rebuild/



Call Crosman at the toll free number and they will send you down the proverbial "Rabbit's Hole" but you will you finally get in touch with the right person!



If it is still under warranty then there may be a different procedure!