Specifications

9
Introduction
MAINTENANCE MANUAL
Inter Axle Differential (IAD)
The Meritor inter-axle differential (IAD) is a driv-
er controlled,
Air actuated traction device. The IAD allows
for speed differences between the forward
and rear axles in a tandem while also provid-
ing equal pulling power from each axle of the
tandem. By activating the IAD switch located in
the vehicle dash, improved traction is provided
for each axle.
The inter axle differential is also known as a
power divider or third differential.
Stall Testing Can Damage a Drive Axle
Stall testing is a procedure used to troubleshoot
transmissions, evaluate vehicle performance,
and test the service and park brakes.
During stall testing, or any similar procedure,
the drive axle input receives multiplied torque,
whichcan exceed the speciedtorquerating.
Excessive torque can damage a drive axle,
which will affect axle performance and compo-
nent life. A drive axle damaged by
stall testing will void Meritor’s warranty.
Call Meritor’s Customer Service Center at 0800-
55-5530 if you have questions regarding stall
testing.
Use of Traction Chains
Meritor recommends that if you are using traction
chains, you should install chains on both tires on
each side of all drive axles on the vehicle.
Identication
Model
Anidenticationtagisrivetedontheaxlehous-
ing or on the differential. Figure 2.3 and Fig-
ure 2.4. Use the model and the ratio number
markedontheidenticationtagandthenumber
on the differential to order replacement parts
Figure 2.3
• When the collar splines engage with the
splines on the differential case, the axle shaft
and the differential assembly lock together.
• WhenthedifferentialoperateswiththeDCDL
in the locked position, there is no differential
action between the wheels
• When the differential is operated in the un-
locked position, there is normal differential
action between the wheels at all times
AXLE HOUSING
IDENTIFICATION TAG
AXLE
IDENTIFICATION TAG
DFFERENTIAL
IDENTIFICATION
TAG