It is a break barrel air rifle that when it is cocked the piston is pushed back drawing air into the cylinder so that when the barrel is closed the breach seal covers the transfer port squeeze the trigger piston flies forward forcing the air through the transfer port into the barrel accelerating the pellet up the barrel and towards the point of impact
It is not a co2 powered air weapon
SOURCE: CO2 cartridge leaks down in seconds in a crosman model 357 (older model six shot)
Frank i would love to help you, i'm an airgun enthusiast too. please tell me the model crosman you're shooting at the moment and i would love to walk you through this, if you need repairs i'll also try to help get you in touch with parts or some ideas for service if it's needed.
SOURCE: need repair manual and parts
You can get the repair manual and parts on link below.
http://www.crosman.com/airguns/service/manuals/crosman-pistols
SOURCE: I own a 40 year old crosman 140, .177 cal air
REMOVE THE FOREARM PUMP ASSY SEE IF THE CUP IS WORN OR SHRUNK
PUT SOME LIGHT OIL ON THE CUP AND SPREAD
IT OPEN AND FLEX IT SOME SO THAT IT SPREADS OUT TIGHTER IN THE TUBE
YOU CAN ORDER PARTS FROM CROSSMAN
SOURCE: Hello, i have a Crosman 760 Pumpmaster Air Rifle,
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.
Testimonial: "Thanks! i didnt know anything about this before and now everything so much clearer. Thanks Again! Joe."
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