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Copyright Meritor, Inc., 2022
MM-0861 / Revised 06-22
Page 100
Printed in USA
11 Lubrication and Maintenance
NOTE:
The transfer case oil fill volume does not account for the
external cooling system. If this is a maintenance oil change, where
the cooling system is not drained, the additional cooling system
volume does not need to be added to the transfer case.
1. Fill the transfer case to the bottom of the oil fill plug opening.
See "Table G: Transfer Case Oil Specifications" on page 102.
2. After filling the transfer case, apply Loctite
®
592 or equivalent
to the oil fill plug and tighten to 38 lbs-ft (52 Nm).
3. If cooling system drain-back has occurred, add the cooling
circuit quantity through the alternate fill location / breather
hole.
4. Complete the "Pump Priming and Pressure Check Procedure"
Pump Priming and Pressure Check
Procedure
For MTC-4213 models, the pressure check procedure is not
necessary.
Pump priming pushes lubricant through the pump and cooling
system lines. It is important during this procedure that the oil
volume for both the transfer case AND the cooling system be
added to the transfer case. Please reference OEM documentation
for the cooling system volume. Before the priming procedure is
started, the volume of the cooling system must be added through
the alternate fill location / breather hole. Figure 11.5.
NOTE:
At this point the transfer case oil level will be higher than
the bottom of the primary oil fill hole. After priming is completed,
this level will drop. Check the oil fill level in the transfer case and
ensure it is to the bottom of the fill hole.
For units with a external rear-mounted oil pump, monitor the oil
pressure during the priming procedure.
1. Install a pressure gauge to the diagnostic port using a suitable
adapter. For XL/XLEV use the diagnostic port shown in
Figure 11.6. For XLEC use the diagnostic port shown in
Figure 11.7.
2. Use one of the following methods to test the oil pump
pressure:
• Test Drive:
Install the gauge on a hose long enough to
position the gauge inside the vehicle cab and road test the
vehicle for at least two miles (3.2 km), at a speed of at least
30 mph (48 km/h).
• Stationary:
If the transfer case is not equipped with a
neutral range shift, remove the rear drive shaft from the
transfer case rear output yoke. Place the transfer case
in high range, 2-wheel drive, and the transmission in 4th
gear (1:1 ratio), and run the engine at least 400 rpm for 20
seconds.
4006328a
INLET
FITTING
CAP
TEE
FITTING
PRESSURE
SIDE
DIAGNOTIC
PORT
XL/XLEV VARIANT
Figure 11.6
PIPE PLUG
4016831a
XLEC VARIANT
OR
Figure 11.7