Iveco Stralis AT/AD. Manual — part 139
Figure 2
- Set the vehicle on level ground and lock the front wheels.
- Drain the oil from the axle housing through the drain
plug.
- Take out the screws (7) and disconnect the propeller
shaft (8) from the differential flange.
- Secure the propeller shaft to the vehicle’s chassis frame
with an appropriate rope.
- Disconnect the electrical connection (4) for the switch
(5) signalling differential locking and the air pipe (3) from
the differential locking control device.
- Disconnect the screws (1) fixing the drive shafts (2) and
extract them from the axle housing.
- Using the hydraulic jack, put the mount 993770616 (10,
det. B) under the differential and constrain the brackets
(11) of this mount to the flange (12) of the differential
sleeve (det. B).
- Unscrew the screws (6) and nuts (9) fixing the differen-
tial assembly to the axle housing.
- Remove the plugs (' det. B) from the threaded holes and
screw appropriate screws into them so as to extract the
differential from the axle housing.
72797
Removal
Refitting
For refitting, carry out the operations described for removal
in reverse order, keeping to the following instructions:
- The self-locking nuts have to be replaced with new parts
for each removal.
- After thoroughly cleaning the parts, apply sealant paste
onto the threads of the screws fixing the differential case
and the drive shafts.
- Tightening sequence diagram (differential case to axle
housing) (det. A)
1 — 2 — 3 — 4 nuts;
10 — 9 — 14 — 5 — 7 — 11 — 13 — 6 — 8 — 12 screws.
- Tighten the screws and nuts fixing the differential case
to the rear axle at the required torque and in the se-
quence indicated in the diagram.
After refitting:
- Screw the drain plug on and restore the level of oil with
the required quantity and grade.
- Check there is no leakage from the air pipe of the differ-
ential locking device and that it engages.
- Check that the differential locking indicator light in the
cab works correctly; if it does not, keep to the instruc-
tions described in the relevant section.
Instructions to adjust and check the operation of the trans-
mitter controlling differential locking and divider engagement.
The operation of the transmitter (two-function type) to con-
trol differential and divider engagement is adjusted and
checked with the axle mounted on the vehicle and proceed-
ing as described below:
- With differential locking, screw down the transmitter to
close the contacts and check the indicator light in the cab
comes on.
- The moment the indicator light in the cab comes on,
screw down the transmitter one more turn.
- Tighten the lock nut to lock the transmitter at a torque
of 40 Nm (4 kgm).
- Release the divider and differential locking engagement
control and check that the contacts are closed (in this
condition, the indicator light in the cab must be off).
6
REAR AXLES
S
TRALIS
AT/AD
Base - January 2003
REAR AXLE MS 13-175
7
S
TRALIS
AT/AD
5250
Rear Axle
MERITOR MS 13-175
with disc brakes
Page
DESCRIPTION
9
. . . . . . . . . . . . . . . . . . . . . . . . . .
CHARACTERISTICS AND DATA
10
. . . . . . . . . . .
TIGHTENING TORQUES
11
. . . . . . . . . . . . . . . . .
TOOLS
13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OVERHAULING THE REAR AXLE ASSEMBLY
18
.
OVERHAULING THE WHEEL HUBS
18
. . . . . . . . .
-
Removal
18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
Replacing wheel hub bearings
20
. . . . . . . . . . . . .
-
Checking the parts forming the wheel hubs
20
. . .
-
Replacing the wheel fixing pins
20
. . . . . . . . . . . .
REMOVING AND REFITTING THE DIFFERENTIAL
24
-
Removal
24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
Refitting
24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REPAIRING THE DIFFERENTIAL
25
. . . . . . . . . . . .
-
Removing the differential
25
. . . . . . . . . . . . . . . . .
-
Removing the gearcase
26
. . . . . . . . . . . . . . . . . .
REMOVING THE BEVEL PINION
FROM THE SUPPORT
28
. . . . . . . . . . . . . . . . . .
-
Differential component check
28
. . . . . . . . . . . . .
-
Fitting the gear housing
29
. . . . . . . . . . . . . . . . . .
FITTING THE MOUNT ON THE BEVEL PINION
30
-
Reassembling the differential housing
32
. . . . . . . .
ADJUSTING THE CAP GAP
34
. . . . . . . . . . . . . . . .
CORRECTING THE CROWN WHEEL AND
PINION CONTACTS (after assembly)
37
. . . . . .
WORK ON THE VEHICLE
40
. . . . . . . . . . . . . . . . .
REPLACING THE BEVEL PINION MOUNT SEAL
40
-
Disassembly
40
. . . . . . . . . . . . . . . . . . . . . . . . . . .
-
Assembly
41
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
REAR AXLE MS 13-175
S
TRALIS
AT/AD
Base - January 2003
The rear axle is the load bearing type with a single reduction.
It is composed of a pressed sheet steel box appropriately
strengthened.
The differential consists of a group of hypoid gears of coarse
pitch type.
The pinion is supported by two tapered roller bearings (pinion
unit) and by a third cylindrical roller bearing.
The position of the bevel pinion, in relation to the ring bevel
gear, is adjusted by changing the thickness of the pack of rings
between the differential case and the bevel pinion mount.
The gearing box is supported by two tapered roller bearings
and can be adjusted axially with two threaded ring nuts.
The rear axle is equipped with a differential locking device.
The bearings of the wheel hubs are the UNIT-BEARING type
with permanent lubrication and need no adjustment.
The brakes are of disc type with KNORR float calipers.
Figure 1
84400
VIEW OF THE MERITOR MS 13-175 REAR AXLE ASSEMBLY
REAR AXLE MS 13-175
9
S
TRALIS
AT/AD
DESCRIPTION
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