Group 20, Drive Axle
20-3-2 • General operation of drive axle SM 765, Nov ’06
Checking: Check the steel part if there is mark, deforma-
tion or discoloration that is related to inappropriate lubri-
cating work, notch, and step or scratch.
Check the fitting, discoloration and broken area of bearing
ball, cage or retainer, roller and raceway
Check the abnormal contacting pattern of gear that has
serious symptom of abrasion, fitting and crack across to
the contacting line.
Check the crack, scratch and abrasion of processed sur-
face for casting or malleable parts, wider drill hole and
crack or burr of contacting surface.
Check the fastener if it has rounded head or damaged spi-
ral area or is curved or cracked.
IMP
RTANT
All damaged parts that affect to the align-
ment and structure should be replaced. The
repair with welding or correction is not
allowed. These works can cause the malfunc-
tion when the load is applied because it
affects the housing of casting product.
Curved head, crack or leakage, loosen stud,
crossed-type screw hole of all housings
Repair and replacement of part
Protect the wheel drive axle such as seal and washer from
the early abrasion, and replace it with low-priced parts
that do not give big cost of repair.
Replace the seriously worn part even though it is not bro-
ken.
The steel parts such as shaft or gear can't be repaired. If it
is worn or damaged, it should be replaced.
The seal and washer has to be periodically replaced. For
the fastener with auto-locking patch, it is possible to reuse
if it is fixed by dropping the heavy duty thread locker for
many times.
The repair of wheel drive axle housing is limited to the
removal of scratch or burr on the processing surface or
replacement of damaged stud. Because the cost of new
part is very small in comparison to the total cost of labor
power and malfunction time of machine and it may
require more cost after the repair, it is better avoiding the
reuse of the damaged parts. To decide reuse or replace-
ment of drive axle part, the internal force, time to use and
application of unit shall be considered.
When it needs to be replaced, use official product of
CLARK to maintain the unit performance and extend the
life.
The checking procedure that is advised to various parts is
as follows.
Bearing
Replace the bearing if there is hole or it is broken or dis-
colored. Always replace one set of bearing cup and cone.
Do not separately replace the bearing and race.
Replace the bearing with considerable gap.
Check the fitting of bearing. The internal race of bearing
has to be firmly inserted into the shaft. Tighten the outer
race to the housing bore. If the bearing gets out from the
bore, replace the housing.
Gear and Shaft
Check the frosting and fitting of gear tooth. The frosting
on the tooth surface of gear does not affect to the malfunc-
tion of transmission. When continuously uses unit, the
frosting of gear won't be developed to the fitting condi-
tion. Most likely, the gear tooth that is a little bit fitted can
be reusable. However, if the fitting is serious, the gear has
to be replaced.
If it is possible to use Magnaflux, check the damage of
part with it.
If the heat-treated part of gear tooth is worn or cracked,
replace the gear.
Check all shafts if the tooth is curved or cracked or the
spline is broken.
Spline
Check the abnormal abrasion from the spline of all gear
and shaft. If the spline is excessively worn or fitted,
replace the relevant part.
O-Ring
Replace all O-ring whenever overhauling. Lubricate the
O-ring and seal with gear oil before the reassembly.
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