TM 5-2420-230-10
The DIFFERENTIAL LOCKS switches (1) allow the driver
to lock the front, rear, or both differentials. The
DIFFERENTIAL LOCK indicator shows which differential is
locked.
NOTE
The vehicle must be stationary when engaging
or disengaging differential locks.
Locking the front differential considerably
increases vehicle turning radius, and additional
effort is required to steer the vehicle.
In conditions where four-wheel drive is not providing
sufficient traction, the rear differential should be locked by
pressing the REAR DIFFERENTIAL LOCK switch. In
extreme conditions where more traction is required, the front
differential may be locked by pressing the FRONT
DIFFERENTIAL LOCK switch. The front differential lock
should only be used when traveling in a straight line or on
If the differential lock fails to disengage, stop the vehicle, then
drive in reverse a short distance. Differential lock should
disengage. If it does not, repeat procedure.
NOTE
The vehicle must be stationary and in
N (Neutral) before changing the range shift.
The RANGE SHIFT switch allows the driver to select a
LOW or HIGH range ratio for the transmission. The
HIGH range is used for highway and fast off-road
driving, and the LOW range is used for off-road and FEL
operations. The vehicle must be stationary and in
N (Neutral) before changing the range shift.
The IHMEE is equipped with full-time power steering, operating on the front wheels. To turn the vehicle to the left, the driver
turns the steering wheel to the left. To turn the vehicle to the right, the driver turns the steering wheel to the right. The driver
only has to assert enough manual effort to overcome the torsion bar and the rotary valve in the system.