Back up here: You said you jump started it. It must have turned over. Now when you say 880 engine. Is this a gas or a diesel? How many teeth are on the gear in the starter. Not all Olivers use the same number of teeth on the ring gear. Does your rebuilt starter turn the correct direction. We had a guy that had a mounted picker on his tractor and broke the nose cone and bent the armature. Got him a rebuilt. He put it on. No luck: in checking the starter was wired for the opposite rotation.