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Forward Tandem Carrier
Vehicle Will Not Move
TP-99125
16579/24240 Issued 12-99
Printed in the USA © Copyright Meritor Automotive, Inc., 1999 Page 2
Forward Tandem Carrier Vehicle Will Not Move
Damaged?
Yes
No
Contaminated?
Yes
No
Remove and
disassemble the input
shaft and
inter-axle differential
assembly. Refer to MM 5L.
Damaged?
No
Yes
Damaged or
contaminated?
Yes
No
Disassemble the
inter-axle
differential case.
Yes
This flowchart continues
on the next page.
No
Damaged?
Yes
No
Bolted
Welded
Damaged?
Yes
No
Inter-axle
differential case
bolted or
welded?
Visually inspect
the carrier
in the axle
housing.
Remove the
carrier from the
axle housing.
Repair the carrier
or install a
remanufactured
carrier.
Drain and inspect
the lubricant.
Refer to MM 1.
Determine the
source of
contamination.
Remove the
carrier from
the housing.
Refer to MM 5L.
Visually inspect the ring
pinion gear set for
damage. Refer to TP-9955,
Failure Analysis for
Drive Axle Components.
Repair the carrier
or install a
remanufactured
carrier.
Refer to MM 5L.
If the carrier is a pump model,
inspect the input shaft oil
pump for damage and the oil
screen for contamination. Refer
to TP-9955, Failure Analysis for
Drive Axle Components.
Check for further carrier
damage. If none is found,
repair or replace the oil
pump, clean or replace the
oil screen and install the
carrier. Refer to MM 5L.
Inspect the inter-axle differential
assembly for damage. Refer to
TP-9955, Failure Analysis for
Drive Axle Components.
Check for further carrier
damage. If none is found,
replace the damaged
inter-axle differential
components and install the
carrier. Refer to MM 5L.
Inspect the pinion
gears and spider.
Refer to TP-9955,
Failure Analysis
for Drive Axle
Components.
Inspect the inter-axle differential
spider, side gears, thrust washers
and bearings. Refer to TP-9955,
Failure Analysis for Drive
Axle Components.
Check for further carrier
damage. If none is found,
replace the inter-axle
differential components
and install the carrier. If
the inter-axle differential
case is welded, replace
the entire inter-axle
differential case.
Refer to MM 5L.
Inspect the main differential
bearings for damage.
Refer to TP-9955,
Failure Analysis for
Drive Axle Components.
Repair the carrier
or install a
remanufactured
carrier.
Refer to MM 5L.
Check the ring gear backlash
and record the reading.
Refer to MM 5L. Use the
backlash reading when
you reassemble the carrier.
Damaged?