
Copyright Meritor, Inc., 2020
Printed in USA
MM-0861 / Revised July 2020
Page 77
6
Assembly
External Oil Pump Priming Procedure
(MTC-4208XL/XLEV & MTC-4210XL/XLEV)
Prior to the pump priming procedure, check the oil fi ll level in the
transfer case. The level should be the bottom of the fi ll hole.
CAUTION
PRIOR TO PERFORMING A PUMP PRESSURE TEST OR OP-
ERATING THE VEHICLE, VERIFY THE OIL PUMP IS PRIMED.
IF THE PUMP IS NOT PRIMED, DAMAGE TO COMPONENTS
CAN RESULT.
1. Prior to connecting the oil cooler line to the tee fi tting, remove the
tee fi tting upper cap and add SAE Grade full-synthetic 40W or
50W oil, Meritor specifi cation O-81, to the tee fi tting until the tee
fi tting cavity is completely fi lled. Figure 6.51.
Figure 6.51
TEE
FITTING
PRESSURE
SIDE
INLET
FITTING
4006328a
CAP
CAP
2. Reinstall the cap on the upper tee fi tting.
Pump Pressure Test & Oil Fill Check
NOTE:
For MTC-4208/10 XLEV 10EC variant models, refer to the other
procedure provided in this section.
WARNING
THE TRANSFER CASE AND OIL LINES MAY BE HOT. USE
CARE TO AVOID GETTING BURNED.
1. With the vehicle on a level surface, fi ll the transfer case to the
bottom of the fi ll hole with SAE Grade full-synthetic 40W or 50W
oil, Meritor specifi cation O-81.
2. Install the 3/8” female JIC fi tting onto one end of the 10’ (3.05
meter) pressure hose and the pressure gauge onto the other end.
3. Connect the female fi tting to the unused port of the diagnostic tee
fi tting. Figure 6.51.
4. Route the gauge to a position where it can be viewed in the cab of
the vehicle.
CAUTION
WHEN PERFORMING AN OIL PUMP PRESSURE DIAGNOSTIC
CHECK, ROAD TEST THE SYSTEM FOR ONE MILE (1.6 KM).
IF THE OIL PRESSURE IS NOT AT LEAST 3 PSI (0.21 BAR)
AFTER ONE MILE, TURN THE VEHICLE OFF. DO NOT REPEAT
THE ROAD TEST. DAMAGE TO COMPONENTS CAN RESULT.
CALL THE MERITOR ONTRAC™ CUSTOMER CALL CENTER
AT 866-668-7221 FOR ASSISTANCE.
5. Perform an oil pump pressure diagnostic check. Road test the
system for one mile (1.6 km) above 30 mph (48 kph) or until the
oil pressure reaches 10 psi (0.69 bar), whichever comes fi rst.
• A positive pressure greater than 3 psi (0.21 bar) indicates
the pump and oil cooler system are primed.
• If oil pressure is not at least 3 psi (0.21 bar) after one mile:
Turn the vehicle off. Do not repeat the test or damage to
components can result. Call the Meritor OnTrac™ Customer
Call Center at 866-668-7221 for further assistance.
6. Remove the diagnostic equipment and plug the diagnostic port.
7. Reinstall the diagnostic port cap. Tighten to 35-40 lb-ft (47-54
N∙m).
8. Check the system for leaks at all fi tting connections and transfer
case oil ports.
9. Check the oil fi ll level in the transfer case. The level should be
below the fi ll hole following the priming run.
10. Refi ll the transfer case to the bottom of the fi ll hole.
Summary of Contents for MTC-4208X Series
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