I hope I can help. The kt trucks have two control valve options, finger tip joystick or mechanical lever and the control valves are different. The pump motor control has two options, chopper control or contactor type. I would guess your pump motor control is working. The chopper type varies the motor speed. I would check the pump pressure at the control valve pump pressure inlet. I think there may be a 1/8 pipe plug tap. You should see about 2625 psi relief with the tilt dead headed. The relief is on top of the control valve to the left. Let me know if you need more information. Just post you control type and re-check your serial#. I could not get it to come up.