TM10-3930-660-20 18-23. BOOM CHAIN PULLEYS -   REPLACE  (Cont‘d) 6. 7. 8. SUPPORT CHAIN PULLEY (27). REMOVE PULLEY PIN (28). REMOVE CHAIN PULLEY (27) AND BUSHINGS (29). REMOVE LUBRICATION FITTING (30) , IF NECESSARY  . INSTALLATION -  EXTEND CHAIN  PULLEY 1. 2. INSTALL LUBRICATION FITTING (30), IF REMOVED  . INSTALL PULLEY (27 ) AND BUSHINGS (29). SECURE WITH PULLEY PIN (28) , NEW LOCKWASHER (26) , AND CAPSCREW (29) l a. b . Position chain pulley (27) with bushings (29) on the boom. Install pulley pin (28). NOTE Loctite 242 to threads of capscrew Apply (25) as installed. c. Secure pulley pin (28) with new lockwasher (26) and capscrew (25). Apply Loctite 242 to threads of capscrews  (20). 3*   INSTALL PULLEY (24) AND PULLEY SUPPORT (23) WITH TWO FLATWASHERS (22),  TWO  NEW  LOCKWASHERS  (21), AND TWO CAPSCREWS (20). a. b. Install pulley (24) and pulley support (23) on boom. Install two flatwashers (22), two new lockwashers (21), and two capscrews  (20). 4. 5. CHECK/ADJUST CHAIN ADJUSTMENT, PARA. 18-24. CHECK/ADJUST HYDRAULIC HOSES AND ELECTRICAL CABLE PARA. 18-25. 18-93