Here is a parts list.
This place has all the parts for your machine. You can find cheaper bearings with part numbers off of the part itself for some things. Not sure I would go right at the pump as the culprit.
Change the hydraulic filters and cut in to your old ones and look for debris. Also...
https://www.trackloaderparts.com/
I have ordered many parts from these guys. They have direct manufacturer part numbers from the parts diagrams. Might be pricey , but they have them.
https://www.vibra-tite.com/threadsealants/anaerobic-threadsealant/vibra-tite-440-pneumatichydraulic-sealant-thread-sealant/
This is what I have been using on all my connections.