Head scratcher there. Maybe I can track down a manual at the shop and see. I’ll give it a shot and see what if it works.Well as I said I'm not familiar with these machines but did take a quick look on SIS and saw this remark:
Oil is supplied to the left travel motor (1) by the left pump through the swivel. Oil is supplied to the right travel motor by the right pump through the swivel.
So I'd say one would need to be sure the problem is in the motor and not the pump or swivel. It would be nice if the lines for the right drive and left drives could be temporarily swapped to prove where the problem was, maybe at the control valve?
Strange thing is when I check the parts book on the machine I'm not seeing these two pumps. Is Cat trying to confuse me?