Ray,
Yes, unlike the Superstreak, you don't need a spring compressor with the ram.
Make a spanner wrench to fit the end cap holes, or, for now, I put two, short #1 Philiups screw drivers in the holes and held them together as I put a larger screw driver between them to lever the cap loose.
Be very careful. The end cap is in quite tight and it's made out of plastic. A properly fitting spanner wrench would be much safer to use on the plastic end cap. Especially for those not used to working with tools every day. I'll be making one up for this gun out of bar stock and rod, when I get to work.
Then unscrew the back cap a few turns and the pe- load is off the ram. Finish unscrewing the end cap. The cap, thin washer, the end seat for the ram, and ram all fall out. Remove the piston and proceed like you would with a coil spring powered gun.
Paul.