TM 10-3930-659-20 17-6. MAIN HYDRAULIC PUMP REPLACEMENT (Con't). 2. Remove coupling (5) from main hydraulic pump (4) or transmission (1). 3. Remove snapring (6) from coupling (5). 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 snaprlng (6) in coupling (5). 2. Position coupling (5) on main hydraulic pump (4). NOTE Bottom  two  screws  should  be  held  in  position  against  flange  of  main  hydraulic  pump during Installation. 3. Install new gasket (7) and main hydraulic pump (4) on transmission (1) with four washers (2) and screws (3). FOLLOW-ON TASKS: • Install priority valve-to-main hydraulic pump line and fittings (see paragraph 12-8). • Install hydraulic reservoir-to-main hydraulic pump line and fittings (see paragraph 17-18). • Install fork/brake hydraulic pump (see paragraph 17-5). • Remove frame locking bar (see TM 10-3930-659-10). TA707624 17-20