Pyramidair.com has a seal kit. it also comes with a diagram. Benjamin and Sheridan air rifles do not have springs to propel the pellet. also never use vasalin. specifically for a Benjamin or Sheridan you need to use pelgun oil (also found at pyramideair.com). use pelgun oil because it is a non detergent fossil compound) the main intention is to condition the seals every 250 rounds. never use silicon based lube for this gun specifically. silicone lube is for spring air rifles such as break barrels.
SOURCE: I need a parts diagram for a benjamin sheridan
you can find parts diagram in crossman web page under other help compleat dig with part#s
SOURCE: Benjamin Marauder air rifle is leaking air ????
If a drop of oil in there won't swell up the seal, you will have to send it back to Crosman. They bought all Benjamin/ Sheridan services, they repair the rifles fairly cheap. You cannot take this apart, If you do, you will be sending them the pieces anyway. They have giant presses and jigs for holding the springs. I have had a bunch of rifles sent there. Check it out.
SOURCE: Benjamin 392 air rifle leaks
Put oil in barrel in chamber and clean out dirt with compressed air.
BE CAREFUL
SOURCE: need parts for a benjamin franklin air rifle moel
http://www.crosman.com/airguns/service/repair
I couldn't find the model 317, But crosman bought benjamin, sheridan. Check it out.
SOURCE: Benjamin Air Rifle Model 342 not building pump pressure
Springs tend to loose their performance after a few years is air rifles. Check also the seal/o rings on the piston rod and the blow hole. I found waxing it with Vaseline makes it last longer and seals more.
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