3-18
LX31/41 Electric Work Platform
M
AINTENANCE
Section
3.16
3.16 T
ORQUE
H
UB
S
EAL
R
EPLACEMENT
Roll And Leak Testing
IMPORTANT: Torque hubs should always be roll
and leak tested before disassembly and
after assembly to make sure gears and
sealants are working properly.
Roll Test
Gears should be able to rotate by applying a constant
force to the axle. Some gear packages roll with more
difficulty than others. Do not be concerned if gears
seem to roll hard as long as they roll with consis-
tency. If you feel more drag only at certain points the
gears are not rolling freely and should be checked for
improper installation or defects.
Leak Test
The purpose of a leak test is to make sure the unit is
air tight. Pressurize hub to 5 PSI (7 N-m). Torque hub
has a leak if the air pressure starts to fall after hub
has been pressurized. Use soap and water on hub to
detect location of leaks. If a leak is detected, seal or
O-ring must be replaced.
Pressing Tools
Use pressing tools to remove the seal, cup and cone.
Disassembly
CAUTION: Safety glasses should be used during
disassembly of hub.
1. Remove two pipe plugs in cover and drain the oil
from the unit.
2. Loosen and remove shoulder bolts and cap
screws from cover. Remove cover from hub.
3. Remove O-ring. Remove thrust washer from
counterbore in cover.
4. Remove input gear from planet gears.
5. Using a punch, remove retaining ring from groove
around inside of input gear.
6. Lift carrier sub-assembly from hub. Lift ring gear
from hub. Remove O-ring from counterbore in
hub.
7. Remove pipe plugs from side of hub body.
8. Apply a preload to output shaft to remove retain-
ing ring. Follow steps a & b.
a. Place bearing cone pressing tool on retaining
ring.
b. Apply pressure to fixture using a hydraulic ram
or by striking the fixture with a soft face ham-
mer. Pressure should be applied until hub
rotates with difficulty.
9. Using retaining ring pliers remove retaining ring.
Remove spacer from output shaft.
10. Place spacer under hub so output shaft will fall
through bottom when pressed out.
11. Press output shaft out of hub. Output shaft may
come out with bearing cone and seal attached.
Remove seal and discard. Use a punch and ham-
mer to remove bearing cone. Be careful not to
strike shaft with punch.
12. If seal and cone remain in hub, press them out
using a pressing tool.
13. Lift bearing cone out of hub.
14. Stand hub on its small end. Using a punch and
hammer, remove bearing cup from counterbore
of hub. Be careful not to strike counterbore with
punch.
15. Turn hub over on larger end. Using a punch and
hammer, remove bearing cup from counterbore
of hub. Be careful not to strike counterbore.
NOTE: Carrier sub-assembly does not need to be
disassembled to replace seals.
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