Front Axle Declutch Does Not Engage/Disengage Diagnostics - Meritor MM-0861 Maintenance Manual

Front Axle Declutch Does Not Engage/Disengage Diagnostics

Check indicator light,
and engagement and
disengagement sensors
for correct operation.
Light or
sensor
faulty?
Check the available air
pressure. The transfer
case requires at least
60 psi (4.14 bar) at all
times to operate correctly.
Air
pressure 65 psi
(4.48 bar) or
more?
Air
system
contaminated?
Remove the transfer case from the vehicle.
Follow disassembly procedures.
Inspect the front axle drive gear, shaft, shift
collar, collar engagement teeth on gear, shift
fork, shift fork bore, piston, o-ring, and return
spring for damage.
Repair all damaged components.
Figure 10.5
Printed in USA
Turn wheels left and right several
times, then try to shift declutch.
No
Yes
No
No
No
Yes
Check the piston cylinder on the declutch.
Yes
Clean the air supply system.
Refer to OEM instructions.
Verify the transfer case shifts correctly.
No
Declutch
shifts
correctly?
Replace faulty indicator
light or sensor, then
try to shift declutch.
Declutch
shifts
correctly?
Correct system air pressure.
Refer to OEM instructions.
Reassemble the transfer case.
Verify the transfer case shifts correctly.
Check the PTO for leaks.
Reinstall the transfer case onto the
vehicle. Road test the vehicle to
confirm the problem is corrected.
Return the vehicle to service.
Copyright Meritor, Inc., 2022
10 Troubleshooting
Yes
Return the vehicle
to service.
Yes
Return the vehicle
to service.
Return the vehicle
to service.
Return the vehicle
to service.
4001529d
MM-0861 / Revised 06-22
Page 95