Follow the operating guidelines in Table 15.2 when
driving a vehicle equipped with a Meritor MTC
transfer case.
Engaging and Disengaging the Steer
Axle
Dash-mounted switches control the transfer case
functions; see Chapter 4 for more information.
IMPORTANT: The wheels must not slip during
engagement of the steer axle driveline.
To engage the steer axle driveline, drive the vehicle
at a constant speed below 10 mph (16 km/h) and
press the AWD switch. An audible engagement may
be heard.
To disengage the steer axle, drive the vehicle at a
constant speed below 10 mph (16 km/h) and press
the AWD switch. An audible disengagement may be
heard. If the steer axle driveline does not disengage,
the steer axle driveline coupling may be in a bind.
Turn the steering wheel back and forth while driving,
or briefly drive the vehicle in reverse.
Disengaged Steer Axle Engaged Steer Axle
Range Traction Conditions
Applicable
Vehicle
Speeds
Traction Conditions
Applicable
Vehicle
Speeds
HIGH
RANGE
Most normal driving conditions (such as
dry or wet pavement or mixed road
surfaces) when moderate to high
vehicle speeds are appropriate.
0 mph (0
km/h) to
maximum
vehicle speed
When more traction is needed at
moderate to low vehicle speeds on dirt
or gravel surface with shallow to
moderate grades (8% maximum), icy or
snow-covered roads, or hard-packed
sand.
20 mph (32
km/h) or less
LO
RANGE
Not applicable. Do not use LO RANGE unless the steer
axle is engaged.
When maximum power and maximum
traction is needed on steeper grades
(15% maximum), deeply rutted tracks,
deep mud or snow, extremely rocky
surfaces, or soft, loamy sand.
15 mph (24
km/h) or less
IMPORTANT: Engaging the steer axle will increase the turning radius of the vehicle.
Table 15.2, Operating Guidelines, Meritor MTC Transfer Cases
Shifting Between HIGH RANGE and LO
RANGE
MTC Series transfer cases use an air cylinder to shift
between HIGH RANGE and LO RANGE. A dash-
mounted switch operates the shift mechanism (see
Chapter 4 for more information).
Shift between HIGH RANGE and LO RANGE, as
follows:
1.
Stop the vehicle.
2.
Shift the transmission to NEUTRAL.
3.
Apply the parking brake.
4.
Move the dash-mounted switch to the HIGH or
LO RANGE position to pressurize the shift
mechanism in the transfer case. An audible
engagement may be heard (which is normal).
5.
Shift the transmission to FIRST gear and apply
light torque to test the engagement.
If the shifter does not engage when shifting from
HIGH RANGE to LO RANGE, shift the
transmission into REVERSE, then NEUTRAL,
and apply light torque to engage the LO RANGE.
Engaging PTO
Some vehicles are equipped with a PTO mounted to
a Meritor MTC transfer case. For these vehicles,
engage the PTO only when the transfer case is in
neutral, the transmission is in neutral/park, and the
parking brake is applied. To begin using the PTO,
select the drive gear based on the PTO system
operators manual.
Manual Transmissions, Clutch, and Transfer Cases
15.7
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