TM 10-3930-659-20 17-5. FORK/BRAKE HYDRAULIC PUMP REPLACEMENT (Con't). b. INSTALLATION 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. 1. Install new preformed packing (10) and elbow (9) on fork/brake hydraulic pump (8). 2. Install  new  preformed  packing  (11)  and  fork/brake  hydraulic  pump  (8)  on  main  hydraulic  pump  (1)  with  two washers (2) and screws (3). TA707621 17-17