
Copyright Meritor, Inc., 2020
Printed in USA
MM-0861 / Revised July 2020
Page 33
2
Introduction
Operation
Front Axle Declutch
WARNING
NEVER ENGAGE THE FRONT AXLE DECLUTCH WHEN THE
VEHICLE’S WHEELS ARE SLIPPING OR WHEN MOVING UP
OR DOWN A STEEP HILL OR GRADE, WHICH CAN CAUSE
THE VEHICLE TO LOSE STABILITY. SERIOUS PERSONAL
INJURY AND DAMAGE TO COMPONENTS CAN RESULT.
OPERATION OF THE FRONT AXLE SHOULD OCCUR ONLY
ON OFF-ROAD OR POOR TRACTION CONDITIONS. ENGAG-
ING THE DECLUTCH AFFECTS THE VEHICLE’S TURNING
AND STEERING RESPONSIVENESS. NEVER ENGAGE THE
DECLUTCH OR LOW GEAR RANGE UNDER NORMAL OP-
ERATING CONDITIONS. SERIOUS PERSONAL INJURY AND
DAMAGE TO COMPONENTS CAN RESULT.
Speeds of under 20 mph or 32 km/h are recommended for part-time
4x4 or 6x6 operation.
Engage the declutch when the vehicle is stationary or operating at
constant low speed, below 10 mph or 4 km/h.
NOTE:
Front engagement can take place when the wheels are slipping,
but a 150 rpm driveline differential speed guideline must be adhered
to. Special ECU programming is required.
HIGH-LOW SHIFTING
Shift the transfer case into low from high gear or from high to low gear
when the vehicle is stationary. Apply the parking brake with the trans-
mission in Neutral on automatic or manual transmissions.
•
If the clutch does not fully engage:
Turn the steering wheel in one direction and rock the
vehicle back and forth until engagement occurs.
Engagement can be confi rmed by hearing it, noticing improved vehicle
performance, or observing the optional indicator light in the cab.
Oil Cooler Option
Vehicle confi guration can have a signifi cant impact on MTC model
transfer cases. Vehicles with overdrive transmissions used primarily for
high-speed highway routes run at higher transfer case input speeds.
Transfer case running temperature is primarily affected by input speed,
regardless of rear-wheel-drive only or part-time 4x4 or 6x6 operation.
A transfer case oil cooler reduces operating temperatures which will
improve yoke seal life, reduce oil degradation and reduce the likelihood
for other oil and air leaks. Figure 2.8, Figure 2.9, Figure 2.10, Figure
2.11, Figure 2.12, and Figure 2.13.
Figure 2.8
MTC-4208X/XP, MTC-4210X/XP, & MTC-4213X
4007120a
OUTLET TO
OIL COOLER
DRAIN
PLUG
FRONT
LOOP LINE USED
FOR NON-OIL
COOLER
OPERATION
ONLY
INLET FROM
OIL COOLER
FRONT
Figure 2.9
MTC-4208XL & MTC-4210XL
INLET
TUBE
FITTING
INLET
TUBE
PUMP
COVER
REAR
FRONT
ELBOW W/ORIFICE
PLUG-RETURN
FROM COOLER
DRAIN PLUG
MAGNETIC PLUG
OIL PUMP
OUTLET
TO COOLER
4007121a
Содержание MTC-4208X Series
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