TM 5-3810-306-20CAB HEATER/DEFROSTER ASSEMBLY REPLACEMENTTOOLS:General mechanic’s tool kit: automotive (5180-00-177-7033)SUPPLIES:Clean rags (Item 1, Appendix C)EQUIPMENT CONDITIONS: Disconnect ground cable at shunt. (Refer to page 8-109.)Seat and pedestal removed. (Refer to page 15-27.)REMOVAL:1.REMOVE CAB HEATER/DEFROSTER ASSEMBLY(1).WARNINGDisconnect electrical power fromheater before removing covers. Donot run heater with covers removedexcept for troubleshooting oradjustment. Ignition pack generatesa voltage that is high enough tocause severe injury.a. Turn off petcock at heater fuel tank locatedbehind cab on boom pedestal.b. Loosen screw (2) and disconnect controllerwiring harness (3) from heater (1).c. Disconnect multi-pin connectors on bottom ofcontroller wiring harness (3).d. Loosen two setscrews (4) securing heater to cabfloor. Access these screws through controllerwiring harness opening.e. Loosen clamp (5) and disconnect air flow tubing(6).f.Lift heater (1) to disconnect clamp (9) on fuel linehose (7). Plug fuel line.15-34
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