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Copyright Meritor, Inc., 2022
MM-0861 / Revised 06-22
Page 96
Printed in USA
10 Troubleshooting
High/Low Gear Shifting Diagnostics
No
Problem
fixed?
Turn wheels left and right several times,
then try to shift into high or low gear.
Check the available air pressure. The transfer case requires
at least 60 psi (4.14 bar) at all times to operate correctly.
Yes
Yes
Yes
Yes
Yes
No
No
Correct system air
pressure.
Refer to the vehicle
OEM instructions.
Check the piston cylinder.
If dirty, disassemble shifter
components for cleaning.
Clear the air supply sytem.
Refer to the vehicle OEM
instructions.
Verify the transfer case
shifts correctly.
No
Remove the shift cylinder and pistons.
Inspect o-rings, pistons, snap rings, and shift bore.
Repair any damaged components.
Reassemble and check transfer case shifts correctly.
Air
pressure 65 psi
(4.48 bar) or
more?
Vehicle
stationary?
Air system
contaminated?
Shift transmission to neutral.
Shift transfer case to neutral.
Shift transmission into 1st
gear, press lightly on the
accelerator. (PTO models only)
Return the vehicle
to service.
Air blowing
out the housing
breather?
Air blowing
out the neutral
breather or
port?
Yes
No
Return vehicle
to service.
Reinstall transfer case
in vehicle and return
vehicle to service.
Problem
fixed?
Disassemble transfer case and inspect shift shaft, shift fork,
shift collar, and shift bore. Repair any damaged components.
Reassemble and check the transfer case shifts correctly.
Remove the transfer case
from the vehicle.
Disassemble and replace
housing o-ring and piston
o-rings.
Reassemble and verify
transfer case shifts
correcly.
Yes
Problem
fixed?
No
Yes
No
No
Problem
fixed?
Contact OnTrac™
Customer Call Center at
866-OnTrac1 (668-7221).
Reinstall transfer case
in vehicle and return
vehicle to service.
Contact OnTrac™
Customer Call Center at
866-OnTrac1 (668-7221).
No
Yes
4001530c
Return vehicle
to service.
Return vehicle
to service.
Figure 10.6