Master Drive Unit Repair 630 YRM 1003
REPAIR
WARNING
Cleaning solvents can be flammable and toxic and
can cause skin irritation. Wear protection when
handling solvents and always follow the recom-
mendations of the manufacturer.
Clean all of the parts of the MDU assembly thoroughly
with solvent. Inspect each part for damage and replace
any damaged or excessively worn parts. Bearings
should fit snug where they ride on the shaft. If there is
excessive play, replace the bearing and/or shaft. Check
the bearings for smooth operation. If a clean bearing
does not roll smoothly, it must be replaced. Check the
teeth on the gears and on the gear and pinion assem-
blies; see Figure 3, above. If the teeth are chipped or
show wear, they must be replaced. Inspect keys and
keyway grooves for damage. Never reuse a damaged
key. Always check the used gear oil for metallic chips
and shavings. If there are chips or shavings in the oil,
there is wear or damage in the MDU.
ASSEMBLE
Assembly of the MDU is basically the opposite of disas-
sembly. The major difference is installation of the bear-
ing assemblies. Use a bearing driver and hammer to
drive the bearings into place. Be careful not to damage
the casting with the bearing driver and make sure the
bearing is completely seated. The following instructions
refer to the assembly of new or undamaged parts in a
clean work environment.
CAUTION
Useaham
mer and proper size driver when in-
stallin
g bearings to avoid damage to bearings
and/or c
asting.
1. Install
drive axle and bearings:
a. Clean an
d inspect the tapered roller bearings
for wear
or damage. Replace as needed.
b. Grease t
he tapered roller bearings, using a
standa
rd bearing packing device, with multipur-
pose #2
grease with 2% to 4% molybdenum
disulf
ide.
c. Instal
l bearing cone and seal assembly (27)
into ca
sting and properly position seals.
d. Install drive axle.
e. Install gear (30) with the flat side facing out
toward the cover. Install nut (31) and torque to
175 N•m (129 lbf ft).
2. Install gear and pinion assemblies and cover:
a. Clean and inspect the ball bearings for wear or
damage. Replace as needed.
b. Lubricate the ball bearings with gear oil.
c. Install bearings (32) into casting and cover.
d. Install gear and pinion assemblies (33, 34) by
hand.
e. Install gear case cover:
(1) Clean mounting surface of cover and
housing thoroughly to remove oil, old
sealant, and dirt.
(2) Apply Loctite 510™ around mounting
flange of cover.
(3) Install cover to housing using eight cap-
screws (40) and washers (39).
(4) Torque capscrews to 23 N•m (17 lbf ft).
3. Install steering spindle to MDU using the
Allen-head screws (11). Apply Loctite 242™ to
the Allen-head screws and torque to 23 N•m
(17 lbf ft).
INSTALL
The following steps refer to the installation of clean parts
that are new or that have been inspected and meet
specifications.
1. Support MDU with sling and hoist or overhead
crane and raise to a vertical position.
2. Clean and inspect the steer bearings for wear or
damage. Replace as needed.
3. Grease the steer bearings, using a standard bear-
ing packing device, with multipurpose #2 grease
with 2% to 4% molybdenum disulfide.
4. Install lower steer bearing on spindle.
6
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