In addition to try holding brakes down to burn off oil and fix oil leaks anything else of use aside from replacing everything such as band linings and disc linings?
Used machine with about 1800 hrs.On using hydraulics for lift,dump or accessory there is a growling sound and vibrations you can feel especially well in the lift cylinders most noticeable @ low rpm.Hydrostatic drive seems OK.Hydraulic pressure on outlets tops 3000psi.We can find no air leaks...