TM 10-3930-669-34 13-2.  MAST ASSEMBLY REPLACEMENT/REPAIR (CONT). e. Installation. WARNING • Mast assembly weighs 4,000 lbs (1,814 kg).  Attach suitable lifting device prior to removal to prevent possible injury to personnel. • All personnel must stand clear during lifting operations.  A swinging or shifting load may cause injury or death to personnel. (1) With the aid of an assistant, using a lifting device, install mast assembly (15) on pivot and shift assembly (28) with two bearings (29), two bearing clamps (26), two caps (27), four washers (25), and screws (24). (2) Install  fitting  (22)   on   mast   assembly   (15)   with lock nut (23). (3) Install tee (21) on fitting (22). (4) Install elbow (20) on tee (21). (5) Install  elbow  (19)  on  mast  assembly  (15)  with lock nut (18). 13-24