I've had this 312a for a couple months. Never worked too hard just around the shop or loading stuff onsite. The tracks have been week since I bought it. Won't turn with out the help of the boom and spin.. I took out the rotary hub this morning, and there are no seals in the lower 5 grooves. How could this have happened? Would someone take them out and reinstall with out to cover a problem? Any thoughts? Just put the new seals in and see what happens? Thanks, Chris
Check the hydraulic tank, probably lots of small pieces laying in the bottom, and/or the return filter, cooler, etc.