TM 10-3930-659-20 14-10.    REAR BOTTOM GUARD 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. • Use care to keep rear bottom guard balanced on hydraulic jacks at all times.  Failure to follow this warning may cause rear bottom guard to slip from hydraulic Jacks, resulting In serious Injury to personnel. 3. Lower rear bottom guard (1) from frame (4) with hydraulic Jacks and remove from under frame. 4. Remove rear bottom guard (1) from hydraulic jacks. 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. • Use care to keep rear bottom guard balanced on hydraulic Jacks at all times.  Failure to follow this warning may cause rear bottom guard to slip from hydraulic Jacks, resulting In serious Injury to personnel. 1. Position rear bottom guard (1) on two hydraulic jacks. 2. Position rear bottom guard (1) under frame (4) and raise Into position with hydraulic jacks. 3. Install 12 washers (2) and screws (3) on rear bottom guard (1) and frame (4). 4. Lower and remove two hydraulic jacks from under rear bottom guard (1). 14-27