TM 9-4520-272-14&P
FIELD (UNIT) MAINTENANCE
LARGE CAPACITY FIELD HEATER (LCFH)
NSN 4520-01-500-1534
RELAY BOX ASSEMBLY
REPAIR
INITIAL SETUP:
Tools
Personnel Required
Tool Kit, General Mechanics (Item 2, WP 0092
MOS 63J or 52C
Materials/Parts
Equipment Condition
Tags, marking (Item 5, WP 0119 00)
Heater shut down and cool.
Main battery switch OFF and handle removed.
Engine bay access door open.
Remove engine bay top cover.
REPAIR
1. Remove the lower nut (3), lock washer (4), and flat washer (5).
2. Remove the upper nut (6), lock washer (7), and flat washer (8).
3. Remove the relay box assembly (2).
4. Tag all wires inside relay box assembly.
5. Disconnect wires to defective relay.
6. Remove screw and nut that secures defective relay.
7. Remove defective relay.
8. Install a new relay in the relay box assembly (2).
9. Secure new relay with screw and nut removed earlier.
10. Connect wires to new relay.
11. Remove all tags.
12. Align the top and bottom holes of relay box assembly (2) over the studs (9) protruding from the fuel
access panel.
13. Install the upper flat washer (8), lock washer (7), and nut (6). Tighten securely.
14. Install the lower flat washer (5), lock washer (4), and nut (3). Tighten securely.
0062 00-1
