TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
Page 160 of 953
3-78. FAN DRIVE AND FAN BLADE MAINTENANCE a. Removal 1. Disconnect fan drive hose (9) from fan drive (10). NOTE • Mark position of fan blade for installation. • It may be necessary to apply compressed air to clutch adapter. This disengages fan drive clutch to allow access to socket head screws. • The fan drive hose may be modified to add a quick-disconnect at commander’s discretion. Refer to appendix D, Fig. D-94 for installation. 2. Using hex head driver, remove four socket-head screws (1) and fan drive assembly (3) from water pump pulley (2). 3. Remove four nuts (5), lockwashers (6) and fan blade (7) from fan drive (8). Discard lockwashers (6). b. Inspection Inspect clutch adapter (4) and fan blade (7) for damaged threads, cracks, bent blades, or breaks. Replace if defective. c. Installation 1. Align fan blade (7) onto fan drive (8) with four lockwashers (6) and nuts (5). Tighten nuts (5) to 26 lb-ft (35 N • m). 2. Apply sealing compound to four socket-head screws (1) and install fan drive assembly (3) to water pump (2). Tighten socket-head screws (1) to 45 lb-ft (61 N• m). 3. Connect fan drive hose (9) to fan drive (10). TM 9-2320-280-20-2 3-134 Change 3 This task covers: a. Removal c. Installation b. Inspection INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Special Tools Hex head driver, 8 mm (Appendix B, Item 156) Materials/Parts Four lockwashers (Appendix G, Item 133) Sealing compound (Appendix C, Item 43) Manual References TM 9-2320-280-10 TM 9-2320-280-24P Equipment Condition • Hood raised and secured (TM 9-2320-280-10). • Radiator and shroud removed (optional) (para. 3-61).