What is the symptom? Is the shuttle stopping in the middle of travel? Is the machine generating alarms during tool changes? Is it getting turret rotate faults, or shuttle faults?
One other item that can cause the shuttle to stop in the middle of travel is a worn clutch. There is an arm attached to the shaft on the shuttle motor. The hub on this arm is actually a slip clutch that allows the motor to rotate a little after it reaches its travel limit. The slip clutch can wear out from normal use over time. When this happens, the motor turns, but the shuttle only moves halfway or not at all.
There are two brush motors on the Haas tool changer. There is the shuttle motor and the turret rotate motor. I have removed these motors several times. You mentioned the shuttle motor, but Iíll describe the removal of both motors.
If the shuttle motor is to be removed, the clutch arm must be removed first. There is a small set screw on the OD of the clutch that is tightened onto the key on the motor shaft. Loosen this set screw, and separate the arm from the motor. The motorís four mounting screws are removed from the arm side of the plate and the motor slides out from the back.
The turret motor is very easy. It is mounted to an assembly with two switches. All you have to do is unplug the switches and remove the four screws that fasten the motor assembly to the shuttle and then lift it straight up.
If you have to replace the brushes, you will have to contact the manufacturer of the motor.