TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 3 Download
Page 175 of 1170
10-91. HEATER DUCTING REPLACEMENT This task covers: a. Removal b. Installation a. Removal NOTE • Perform steps 1 and 2 for vehicles with new configuration. • Proceed to step 3 for vehicles with old configuration. 1. Remove two capscrews (8.1) and washers (8.2) securing two radio rack upper mounting brackets (8.3) to plenum (7). 2. Remove nine screws (8) securing plenum (7) to “A” beam (4). 3. Remove nine screws (8), two capscrews (6), and washers (5) securing plenum (7) to “A” beam (4). 4. Disconnect connector (23) from light switch (10). 5. Remove two locknuts (25), washers (11), capscrews (12), and washers (11) securing instrument panel (9) to firewall (24). Discard locknuts (25). 6. Remove nut (19), washer (18), capscrew (17), and washer (18) securing panel (9) and hand throttle bracket (15) to steering column bracket (20). 7. Remove nut (13) and screw (16) securing hand throttle bracket (15) to instrument panel (9). 8. Remove screw (14) securing panel (9) to firewall (24) and pull panel (9) away from “A” beam (4) for access to heat flex duct (1). 9. Remove clamp (2) securing heat flex duct (1) to “A” beam (4) and plenum bracket (3). 10. Remove clamp (22) securing heat flex duct (1) to steering column mount (21) and remove heat flex duct (1). INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Materials/Parts Two locknuts (Appendix G, Item 70) Manual References TM 9-2320-280-10 TM 9-2320-280-24P Equipment Condition • Engine access cover removed (para. 10-15). • Front radio rack assembly removed, if equipped (para. 12-132). b. Installation 1. Install heat flex duct (1) to steering column mount (21) and secure with clamp (22). 2. Secure heat flex duct (1) to “A” beam (4) and plenum bracket (3) with clamp (2). 3. Place panel (9) back to “A” beam (4). Secure panel (9) to firewall (24) with screw (14). 4. Secure panel (9) and hand throttle bracket (15) to steering column bracket (20) with washer (18), capscrew (17), washer (18), and nut (19). 5. Secure hand throttle bracket (15) to instrument panel (9) with screw (16) and nut (13). 6. Secure panel (9) to firewall (24) with two washers (11), capscrews (12), washers (11), and locknuts (25). 7. Connect connector (23) to light switch (10). NOTE • Perform steps 8 and 9 for vehicles with new configuration. • Proceed to step 10 for vehicles with old configuration. 8. Install plenum (7) on “A” beam (4) with nine screws (8). 9. Install two radio rack upper mounting brackets (8.3) to plenum (7) with two washers (8.2) and capscrews (8.1). 10. Install plenum (7) on “A” beam (4) with nine screws (8), two washers (5), and capscrews (6). TM 9-2320-280-20-3 10-152 Change 2