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Message: <blockquote data-quote="mmsllc" data-source="post: 91079" data-attributes="member: 13117"><p>If the problem only appears on one side of the machine, then it would make sense that the parking brake has released already, if applicable. Sounds like the hydraulic oil is thinning out once warmed up AND making your issue pretty common in the hydraulic world. Start by jacking the machine up & seeing if either track will freely rotate by hand. If the left rotates, but the right does not, then it is definitely isolated to the output of the left side of the machine. If it does not freely rotate, then your drive motor should be OK. Then, what I would do is install a pressure gauge to the left side pump & verify pressure. I would compare that pressure to the right side pump. If those numbers are no where close to each-other, then I would lean to a bad pump. If the pressures are close in numbers, then I would lean to a drive motor gone bad / bypassing inside of the motor, bad control valve OR a key way has sheared off the output shaft of the drive motor. I hope this gets you on the right 'track' of getting it figured out. (THE PUN WAS INTENEDED!! HA HA HA)</p></blockquote><p></p>