TM 55-1520-240-23-5 6-16 ASSEMBLE DRIVE  SHAFT     (Continued) 6-16 10. Install spacer (11) on adapter assembly (9). NOTE If adapter assembly and shaft assembly does not have the same serial number, they must be returned to depot facility for balancing. 11. Check that adapter assembly (9) and drive shaft assembly (12) have the same vibro-engraved or stenciled serial number.  If stenciled serial number is not readable,  check that the vibro-engraved serial number in the adapter assembly and drive shaft assembly match with serial number recorded in DA FORM 2410 or 2408-16. 12. Apply a light coat of grease (E190) to splines of adapter assembly (9) and drive shaft assembly (12).  Wipe off excess grease with cloth (E120). Wear gloves (E184.1). 13. Align leg (19) marked as number 1 on adapter assembly (9) with leg marked as number 2 on the drive shaft (12) adapter flange (14).  Install adapter assembly (9) on the splines of drive shaft assembly (12). NOTE If new retainer assembly is not available, a used retainer assembly may be used, provided the two nylon inserts are present. 14. Check retainer assembly (8) for presence of two nylon self-locking inserts.  Coat threads of retainer assembly threads with antiseize compound (E75).  Wear gloves (E184.1).  Install retainer assembly in drive shaft assembly (12).  Check for a run on torque of at least  60 inch-pounds  for a used retainer assembly or 180 inch-pounds for a new retainer assembly. 15. Torque  retainer assembly  (8)  to  1500 inch-pounds.  Continue to tighten retainer assembly until slot in retainer aligns with holes in the adapter assembly (9).  Install cotter pin (7), with head on the inside of the retainer assembly (8). 16. Add grease (E190) at fitting (20). INSPECT FOLLOW-ON MAINTENANCE: None END OF TASK 6-50 Change 1