Short follow up. Talked to the nice folks at Argo Manufacturing and purchased the seal kit for my jack. Since it didn't have any external leakage, I replaced the pump seals and did a general relube and clean up and its working well again. I was going to replace the ram seal and wiper, but I saw...
I too have a couple of these Pace race jacks. I think the pump plunger seal is failing as I don't get an equal lift for each pump as I would expect. Can I ask where you got the rebuilt kit? Thanks