Aside from the robot Z assembly itself (P/N 740-652341-00), the Field Replaceable Units for the robot Z assembly are:
Z Motor, P/N 740-652368-00
Up limit sensor, P/N 740-651297-03
Down limit sensor, P/N 740-651297-04
Belt and clamp, P/N 780-658414-00
Brake assembly, P/N 740-661124-00
Venturi pump, P/N 575-656927-00.
Air regulator (descent), P/N 560-651900-00
Air relief valve, P/n 590-651901-00
Air low sensor, P/n 135-650865-00
10-inch air cylinder (pneumatic cylinder), P/N 575-651899-00