I have a 753 bobcat and have been experiencing no power to the right hand drive motor. I took out the motor and resealed it and put it back but had the same problem. Today I switched the two motors and the problem is now on the left side so I believe the pump is okay and something is wrong with my drive motor. I took apart the motor again and all the seals seem to be fine and in proper placement, put it back in and same problem; no power forward or back. Anyone know what I should check next. The only thing I didn't touch is the two allen wrench head screws on the side of the motor because I don't know what they are. Any ideas? Hope you guys can help.