Meritor MTC Series
Some vehicles are equipped with a Meritor MTC Series transfer case for part-time 4x4, 6x6, or 8x8 operation. Meritor MTC Series transfer cases have two gear sets: HIGH RANGE and LO RANGE.
Warning: Do not engage a Meritor MTC Series transfer case when driving on normal highway conditions. Severe personal injury and/or damage to components can result when the transfer case is misused.
Important: Steer axle engagement is limited to 20 percent or less of annual vehicle mileage.
Follow the operating guidelines in Table. 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.
Table 1, Operating Guidelines, Meritor MTC Transfer Cases
|
Disengaged Steer Axle |
Engaged Steer Axle |
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|
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. |
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Table 1, 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:
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Stop the vehicle.
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Shift the transmission to NEUTRAL.
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Apply the parking brake.
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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).
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Shift the transmission to FIRST gear and apply light torque to test the engagement.
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.