TM 5-2420-230-24-1
Table 3-6. Unit Troubleshooting Table. -- Continued
Malfunction
Test or Inspection
Corrective Action
59.
DIFFERENTIAL LOCK WILL NOT ENGAGE.
NOTE
The front and rear axles have differential lock actuators. The troubleshooting procedures are the same for both
front and rear. The front axle differential lock actuator is shown.
Step 1.
Have an assistant put DIFFERENTIAL LOCKS switches (1) in ON position and observe differential lock
actuator clevis (2) for movement or engagement.
If movement is noticed, notify Direct Support maintenance (Para J-8 or Para J-14).
Ensure air pressure is drained to 0 psi (0 kPa) before taking off any air components. If pressure is not
released, components could blow off and harm personnel. The IHMEE air system is pressurized to
119 psi (820 kPa). Do not drain air from a tank with any part of body in air spray path. Skin
embolisms and/or debris in eyes can occur from released pressure. Failure to comply may result in
injury or death to personnel.
Step 2.
Drain air system (Para 15-4) and remove air line (3) at differential lock actuator (4). Start engine and allow
air pressure to build (TM 5-2420-230-10). Observe for air after an assistant puts DIFFERENTIAL
LOCKS switches (1) in ON position.
If air is present, replace differential lock actuator (3) (Para J-8 or Para J-14).
Step 2.1
With DIFFERENTIAL LOCKS switches (1) in ON position, ensure both LED indicators (4.1) illuminate.
If LED indicators do not illuminate, replace valve island (Para 12-34.1).
Change 1
