TM 10-3930-659-20 13-3. COUNTERWEIGHT REPLACEMENT (Con't). WARNING • Use  extreme  caution  when  handling  heavy  parts.    Lifting  device  Is  required  when  parts weigh over 50 lb (23 kg) for a single person lift, over 100 lb (45 kg) for a two person lift, and over 150 lb (68 kg) for a three or more person lift.  Keep clear of heavy parts supported only by  lifting  device.    Failure  to  follow  this  warning  may  cause  serious  Injury  or  death  to personnel. • On-board crane Is heavy.  Assistant is required to raise or lower on-board crane to various operating positions.  Assistant is required to help raise load.  Failure to follow this waring may result in Injury to personnel. 2. Using on-board crane, lift counterweight (2) into position on frame (5). NOTE Ensure that all bolts are started before tightening. 3. Install four washers (3) and bolts (4) on counterweight (2).  Torque bolts to 800 lb.-ft.  (1085 N•m). 4. Remove on-board crane cable (1) from counterweight (2) (see TM 10-3930-659-10) TA706755 13-7