TM 9-2320-361-20 8-10. HYDRAULIC MASTER CYLINDER REPLACEMENT This task covers: a. Internal Leakage Test c. Installation b. Removal INITIAL SETUP: APPLICABLE MODELS REFERENCES (TM) All LO 9-2320-209-12-1 MATERIALS/PARTS Cotter pin Two gaskets Four lockwashers Screw-assembled lockwasher Antiseize tape (Appendix C, Item 27) Cap and plug set (Appendix C, Item 8) Plug P/N 218-5154 Brake fluid (Appendix C, Item 7) PERSONNEL REQUIRED Two TM 9-2320-361-10 TM 9-2320-361-20P EQUIPMENT CONDITION Parking brake set (TM 9-2320-361-10). Adjust brake pedal (para. 8-14). Hydraulic hoist pump propeller shaft (M342A2) removed (para. 12-14). Hydraulic hoist pump control linkage (M342A2) removed (para. 13-22). Transmission PTO shift linkage (M342A2) removed (para. 13-20). CAUTION When disconnecting hydraulic lines and hoses, plug all openings to prevent dirt from entering and causing internal parts damage. Remove caps and plugs prior to installation. I a. Internal Leakage Test I 1. 2. 3. Remove screw-assembled lockwasher (6) from brace (2) and open access door (1). Discard screw- assembled lockwasher (6). Disconnect line (3) from adapter (5). Remove two screws (8) and shield (9) from air-hydraulic cylinder (7). 4. 5. 6. 7. 8. 9. Have drainage container ready to catch brake fluid. Remove line (10) and two gaskets (11) from adapter (12) and adapter (13). Discard gaskets (11). NOTE Have plug ready to replace adapter before removing adapter. Remove adapter (12) from master cylinder (4) and quickly install plug (14). Make sure master cylinder (4) is filled with brake fluid 0.5 in. (12.7 mm) from top (refer to LO 9-2320-209-12-1). NOTE Assistant will help with steps 7 and 8. Measuring distance alongside of brake pedal (15), step down slowly but firmly on brake pedal (15). Maintain steady firm pressure for 30 seconds. Brake pedal (15) should not move more than 0.125-0.25 in. (3.18 -6.35 mm). If brake pedal (15) moves more than 0.125-0.25 in. (3.18 -6.35 mm) in 30 seconds. there is an internal leak. Replace master cylinder (4). 8-26