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Message: <blockquote data-quote="wford" data-source="post: 47820" data-attributes="member: 6365"><p>I've spent the summer trying to solve a weak left-side drive. The pump is a Sunstrand 15-series coupled to a TRW Ross MAB motor. The pump recently had new seals and was lapped then tested to 3000 psi for 20 minutes at a Hydraulic Repair facility. The motor has a new rebuild kit and was lapped after visual inspection but couldn't be tested by the Repair facility for lack of proper spline coupling. When in operation, the unit performs OK as you move the control lever forward (or backward) until you are about half way to maximum speed. According the the system pressure gauge, when the pressure builds to about 1500-1800 psi, the left side falls to zero on system pressure and charge pressure. The right side continues to function normally. And, the left side will return to "normal" once the lever is moved to neutral and then moved forward again. Until the pressure falls to zero on the left side, the torque motor has very good power. If you put the skid steer against an immovable object, the unit will spin the tires until it reaches the 1500-1800 psi threshold. This lemon is a real pain to work on, and I'm growing tired of tearing the thing down and putting it back together with no resolution to the problem. Can anyone help? Thanks!</p></blockquote><p></p>