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Remove the rear hose barb and front 90° fitting, the pump arm, and jam nut off the shaft. Take the cap off the front of the ram's housing - you should see another fitting/elbow with a hex head on it, use that to unthread the ram from the housing.
Throw the ram away, replace with another one. The replacement ram should be something with a 1/2" bore, 1" stroke. I think the nose is threaded for 3/8 coarse thread but I can't confirm that until I pull my Hurc apart.
Edit: nose is threaded for 7/16-20, standard for these rams.
As mentioned in another thread here, the rams are off-the-shelf Humphries. If it's leaking, it's not rebuildable, and you'll need to find a Humphries dealer to order one. It's not a common paintball part.
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