TM 5-2420-230-24-1
12-32. ELECTRONIC CONTROL UNIT (ECU) REPLACEMENT.
This Task Covers:
a. Removal
b. Installation.
c. Follow-On Maintenance
INITIAL SETUP
Equipment Conditions
Test Equipment
None
TM or Para
Condition Description
Vehicle positioned on level
Tools and Special Tools
ground.
Tool kit, general mechanics, Item 38, Appendix B
Parking brake applied.
Engine shut OFF.
Materials/Parts
Electrical master switch OFF.
Tags, identification, Item 63, Appendix C
"Do Not Operate" tag attached
Ties, cable, Item 68, Appendix C
to ignition switch.
Personnel Required
Drawings Required
MOS 62B, Construction Equipment Repairer
TM 5-2420-230-24P Figure 69
References
Estimated Time to Complete
FO-3, Electrical schematic
Refer to MAC in Appendix B
The electrical control unit (ECU) is located under the driver's seat. This ECU supplies power to control levers, transmits
automatic signals (e.g., anti-rollback, automatic return-to-dig, and transmission cutout, etc.), maintains a constant attitude up
and down, interprets the position of the seat, and protects and regulates the system's operating voltage.
a. Removal.
Remove all jewelry such as rings, dog tags,
bracelets, etc. If jewelry or tools contact
positive electrical circuits, a direct short may
result. Damage to equipment and injury or
death to personnel may occur.
NOTE
Tag all wires and note their positions
before removal.
Remove cable ties as necessary.
(1)
Remove two bolts (1), cover plate (2), and
retaining clips (3).
(2)
Unscrew and remove three wiring
connectors (4).
(3)
Remove two bolts (5) and ECU (6).
(4)
Remove seal, if necessary.
Change 1
