TM 9-4120-411-14
4.49 CRANKCASE HEATERS (HR1 & HR8) REPLACEMENT (FDECU-2 ONLY).
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
Tools
Materials/Parts
General Mechanics Tool Kit
Marker Tags (qty 2)
Item 1, Section III, Appendix B
Item 3, Section II, Appendix E
Crimp Nuts (qty 2)
Item 4, Section II, Appendix E
a. Removal. See figure 4-48.
WARNING
Rotating parts and lethal voltage levels are used in operating the FDECU. Be sure
power source is disconnected. Injury or death can occur if connected to power
source.
(1) Shutdown the FDECU per paragraph 2.4 and disconnect it from power source.
WARNING
The FDECU cover is heavy. Be sure the cover retaining rod is in place and
properly secured with hair pin cotter. Injury can occur if cover drops.
(2) Raise and secure cover per paragraph 4.2.
(3) Remove two screws (1) and compressor cover (2).
NOTE
Both crankcase heaters are mounted the same way and the following procedures
apply to either of them.
(4) Locate the two leads (3) inside compressor (4) that go to crankcase heater (5). Tag the leads then cut off and
discard two crimp nuts (6) to disconnect leads. Pull leads out of compressor.
(5) Note crankcase temperature sensor (7) location then fully loosen clamp screw (8) and remove crankcase heater
(5).
4-116
