TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
Page 739 of 953
7-14. HYDRO-BOOST REPLACEMENT This task covers: a. Removal b. Installation INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Materials/Parts Cotter pin (Appendix G, Item 15) Spring tension washer (Appendix G, Item 317) Four lockwashers (Appendix G, Item 146) (Basic/A1 Series) Four lockwashers (Appendix G, Item 133) (A2 Series) Personnel Required One mechanic One assistant Manual References TM 9-2320-280-24P Equipment Condition Master cylinder removed (para. 7-13). CAUTION Cover or plug all open lines and connections immediately after disconnection to prevent contamination. Remove all plugs prior to connection. NOTE Have drainage container ready to catch brake fluid. 1. Mark and disconnect two high pressure lines (4) and one return line (5) from hydro-boost (6). 2. Remove cotter pin (3), washer (2), and disconnect pushrod (7) from brake pedal bellcrank (13). Remove spring tension washer (1) from brake pedal bellcrank (13) and discard cotter pin (3) and spring tension washer (1). 3. Remove four nuts (12), lockwashers (11), washers (10), hydro-boost (6), and gasket (8) from cowl (9). Discard lockwashers (11). 1. Install gasket (8) and hydro-boost (6) on cowl (9) with four washers (10), lockwashers (11), and nuts (12). 2. Install spring tension washer (1) on brake pedal bellcrank (13). Connect hydro-boost pushrod (7) to brake pedal bellcrank (13). Install washer (2) and cotter pin (3). 3. Tighten nuts (12) to 21 lb-ft (28 N• m). 4. Connect two high pressure lines (4) and one return line (5) to hydro-boost (6). b. Installation a. Removal TM 9-2320-280-20-2 7-30 Change 3