Operation and maintenance manual
SM 2149 5-02
Centre Axle - Differential Drive Head
Section 150-0020
6
reuse if original pinion bearings are to be reinstalled.
5. Remove inner bearing cone (110) and nose
bearing (34) from pinion (33) if required.
6. Lift out outer bearing cone (115) from bearing
housing (113). Drift out pinion bearing cups (110 & 115)
of bearing housing (113) for renewal if required.
Note: If either bearing cup or cone needs replacing
both a new cup and cone MUST be fitted.
ASSEMBLY
Numbers in parentheses refer to Fig. 1.
Note: Prior to assembly, lightly oil bearings with clean
gear oil as specified in Section 300-0020,
LUBRICATION SYSTEM.
WARNINGS
To prevent personal injury and property
damage, be sure blocking materials and lifting
equipment are properly secured and of
adequate capacity to do the job safely.
When necessary to drive on components
during assembly, be sure to use a soft drift to
prevent property damage and personal injury.
Bevel Pinion
1. If new nose bearing (34) is to be fitted, apply a light
coating of Loctite 641 to bore of nose bearing then
press onto pinion (33) hard against its abutment
shoulder. To retain bearing, lightly peen over end of
pinion shaft in three places as shown in Fig. 5.
2. Press inner bearing cone (110A) onto pinion (33). If
original pinion (33) and bearings (110 & 115) are being
refitted, install original spacers (111 & 112) onto the
pinion.
Note: If new parts are being fitted, install the largest
available spacers (111 & 112). This is to ensure that
the bearing cannot be over pre-loaded, preventing
bearing damage.
3. Press inner and outer bearing cups (110 & 115) into
bearing housing (113), hard against abutment
shoulders.
4. Insert pinion assembly into bearing housing (113)
and secure with outer bearing cone (115A).
13. Using hide faced mallet, remove crownwheel (46)
from its register on differential housing body (48).
14. Inspect all parts of differential assembly. If there is
any wear or damage install new differential unit
complete. Renew crownwheel (46) and spiral bevel
pinion (33) as a matched pair.
Differential Lock Mechanism and 3rd
Differential Driveshaft
1. Unscrew and remove plug (38) from gear casing (39).
2. Remove diff lock switch (103) and washer (102) from
gear casing (39).
3. Using a suitable drift, drive out lockpin (101) from
operating fork (44) and shaft (42).
4. Withdraw shaft (42) and operating fork (44) assembly
from gear casing (39).
5. Remove capscrew (41) and air cylinder (40) from
shaft (42).
6. Remove retaining spring (43) and separate operating
fork (44) from clutch dog (63).
7. Straighten tab on 3rd diff shaft nut lockplate (79) and
unscrew left hand threaded shaft nut (80). Remove
shaft nut (80), lockplate (79) and bearing (78) from diff
shaft (73).
8. Pull rear end cap (76) from diff shaft (73). Remove and
discard oil seal (77) using a suitable drift.
Bevel Pinion Assembly
1. Remove pinion bearing housing setscrews (114)
then, using hide faced mallet, knock out complete
pinion assembly from gear casing (39) taking care not
to lose any of the pinion setting shims (35).
Note: If the original pinion and crownwheel are to be
reinstalled, retain the shim pack as a unit for reuse.
2. Secure pinion assembly in vice fitted with soft jaws
then remove end nut (117).
3. Pull off helical gear (116), using suitable extraction
equipment.
4. Tap spiral bevel pinion (33) along with spacers
(111 & 112), inner bearing cone (110) and nose bearing
(34) out of bearing housing (113). Remove spacers
(111 & 112) from spiral bevel pinion (33) and retain for