I have a Bobcat model 773, serial number 519011576 I bought this machine with a blown motor, it had set up for a number of years, it is a turbo model but when i replaced the motor I removed the turbo. The motor starts and runs great. When we first started it the lift arms went up and down but would not move. I replaced the trac-lock solenoid because it was missing when i bought it. When you push the push to operate button all the lights come on as if it is ready to operrate but it will not move and now the lift arms will not move, the only thing tha works is the bucket tilts. override button does not change anything.