TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 3 Download
Page 173 of 1170
10-90. HEATER CONTROL CABLE AND SHUTOFF VALVE ADJUSTMENT This task covers: Adjustment Adjustment 1. Push heater control knob (18) to “OFF’’ position. WARNING Ensure engine is cool prior to performing this procedure. Steam or hot coolant under pressure can cause injury to personnel. 2. Loosen two clamps (3) on hoses (4). 3. Rotate heater shutoff valve (1) and position heater shutoff valve lever (5) in the upward position. 4. Tighten two clamps (3) on hoses (4). 5. Loosen screw (14) and clip (13) and remove cable assembly (2) from heater shutoff valve (1). 6. Remove screw (8), washer (9), clamp (10), and crankcase depression regulator valve (11) from mounting bracket (12). 7. Install crankcase depression regulator valve (11) on mounting bracket (12) with screw (8) and washer (9). 8. Cut loop end (6) from spring wire (7). Cut as close to loop end (6) as possible. 9. Remove spring wire (7) from steel casing (16) and tube (15) by pulling heater control knob (18). Remove any kinks in spring wire (7). NOTE If control cable is 47.5 in. (1207 mm) in length, perform step 10. 10. Remove a 5 in. (127.0 mm) section from steel casing (16). 11. Route steel casing (16) through clamp (20). 12. Install spring wire (7) into steel casing (16) and tube (15). 13. Position end of steel casing (16) 0.75 in. (19.0 mm) from clip (13) and install steel casing (16) on heater shutoff valve (1) with clip (13) and screw (14). 14. Position heater control knob (18) 0.125 in. (3.18 mm) from instrument panel (17). 15. Turn spring wire (7) three turns around heater shutoff valve pin (21). Cut off any excess spring wire (7). 16. Pull out heater control knob (18) to “ON” position. 17. Apply lubricating oil to heater shutoff valve lever (5) and shutoff valve pin (21). 18. Apply lubricating oil to plunger (19). 19. Move heater control knob (18) to “OFF” and “ON” several times to distribute oil. 20. Check engine coolant level (TM 9-2320-280-10). 21. Start engine (TM 9-2320-280-10) and check heater shutoff valve (1) connections for leaks. NOTE Perform the following procedure if the heater temperature control assembly is difficult to operate. The repositioning of the heater temperature control cable and heater shutoff valve will reduce cable bends and allow access for lubrication. INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Materials/Parts Lubricating oil (Appendix C, Item 32) Manual References TM 9-2320-280-10 TM 9-2320-280-24P General Safety Instructions Ensure engine is cool prior to performing this procedure. TM 9-2320-280-20-3 10-150 Change 1