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CAUTION
When performing an oil pump pressure diagnostic check, road
test the system for two miles (3.2 km). If the oil pressure is not at
required pressure after two miles, 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.
NOTE: System pressure can be in excess of 75 psi (5.17 bar). Use
an appropriate pressure gauge.
3.
Check the oil pump pressure to verify it has reached 10 psi
(0.69 bar) for XLEC (Figure 11.7) or 3 psi (0.21 bar) for XL/
XLEV (Figure 11.6).
• A positive pressure at or above these ranges indicates that
the pump and oil cooler system are correctly primed.
• If the pressure is lower than these ranges, turn the vehicle
off. Do not repeat the test or damage to components can
result. Recheck the oil fill level at the transfer case fill port
on the front case. Ensure the oil is at the bottom of the fill
hole. Check that the hose and fittings are tight and no leaks
are evident.
4.
Remove the pressure gauge and fitting from the diagnostic
port.
5.
If the pipe plug was removed, apply Loctite
pipe sealant to the pipe plug and reinstall it into the diagnostic
port of the pump cover. Using a 1/4" square drive, tighten the
pipe plug to 15 lbs-ft (20 Nm). If the diagnostic port on the tee
fitting, reinstall the cap.
WARNING
Use caution checking the oil level as it may be hot.
6.
Check the oil fill level in the transfer case within 15 minutes of
priming. Use caution when removing the oil fill plug as the oil
may be hot.
NOTE: The oil level may be higher than the oil fill plug after 15
minutes due to drain back from the cooling system.
7.
Apply Loctite
592 or equivalent to the oil fill plug, install, and
®
tighten to 38 lbs-ft (52 Nm).
Printed in USA
Transfer Case Inspection
Visually inspect the transfer case daily for any leaks. The oil level
should be inspected every 1,000 miles (1069 km), 100 hours or
every month, whichever comes first. In addition, the transfer case
should be inspected for leaks and the correct oil level before and
after extended time high speed road trips. Areas to inspect include:
592 or equivalent
®
Copyright Meritor, Inc., 2022
11 Lubrication and Maintenance
• Cooler lines and fittings
• Seals
• Breather
• Fill and drain plugs
• Pump inlet tube and fittings
• Gaskets and shims
• During the inspection visually check to ensure the transfer
case oil level is to the bottom of the oil fill hole.
Operation
Frequency
Inspect for
Daily
oil leaks
Check oil level 1,000 miles (1609 km), 100
hours, or every month, whichever occurs
first
Check oil
level
Before and after extended time high speed
road trips
Initial oil
2,500 miles (4000 km) or 125 hours,
change
whichever occurs first
Synthetic oil
Every 25,000 miles (40 000 km), 1,250
change
hours, or every 12 months, whichever
occurs first
MM-0861 / Revised 06-22
Page 101
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