TM10-3930-660-34 16-15.   EXTE AND RETRACT CHAINS - REPLACE (Cont’d) f. Attach extend chain (6) end to clevis (7).  Install pin (5) and two retaining rings (4). g. Install cover (3), four new lockwashers (2) and four hex head capscrews (1). 2. ADJUST EXTEND CHAIN (6), TM10-3930-660-20. 3. ADJUST HOSE AND CABLE TENSION, TM10-3930- 660-20. RETRACT CHAIN INSTALLATION 1. POSITION CLEVIS (19) ON END OF RETRACT CHAIN (20).  INSTALL PIN (18) AND RETAINING RING (17). 2. IF REMOVAL WAS NECESSARY, INSTALL RETAINING RING (21) ON PIN (18). 3. INSTALL CLEVIS PIN (16) THRU CLEVIS (19) AND SECURE WITH NEW COTTER PIN (15). 4. INSTALL INNER BOOM, PARA 16-12.1. 5. ADJUST RETRACT CHAIN, TM10-3930-660-20. 16-97