TM 10-3930-659-20 14-9. FRONT 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 front bottom guard balanced on hydraulic Jacks at all times.  Failure to follow this warning may cause front bottom guard to slip from hydraulic Jacks, resulting In serious Injury to personnel. 3. Lower front bottom guard (2) from frame (1) with hydraulic jacks and remove from under frame. 4. Remove front bottom guard (2) 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 front bottom guard balanced on hydraulic Jacks at all times.  Failure to follow this warning may cause front bottom guard to slip from hydraulic Jacks, resulting in serious Injury to personnel. 1. Position front bottom guard (2) on two hydraulic jacks. 2. Position front bottom guard (2) under frame (1) and raise into position with hydraulic jacks. 3. Install six washers (3) and screws (4) on front bottom guard (2) and frame (1). 4. Lower and remove two hydraulic jacks from under front bottom guard (2). 14-25