JLG G12-55A Service Manual - Manual (Page 80)

Axles, Drive Shafts, Wheels and Tires
5-4 G10-55A, G12-55A
5.3.5 Axle Removal
The front and rear axle assemblies differ in that the front
axle assembly is equipped with a parking brake
mechanism and a limited-slip feature; the rear axle has
neither. The following steps outline a typical axle removal
procedure, suitable for either the front or the rear axle
assembly.
Cleanliness is extremely important. Before attempting to
remove the axle, thoroughly clean the machine. Avoid
spraying water or cleaning solution on electrical
components. If using a steam cleaner, seal all openings
before steam cleaning.
Note: Clear the work area of all debris, unnecessary
personnel, etc. Allow sufficient space to raise the
machine and to remove the axle.
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
place the travel select lever in the (N) NEUTRAL
position, engage the parking brake, straighten all
wheels and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and steering wheel, stating that the machine
should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Properly disconnect the battery.
5. Remove the optional fender assembly.
6. If the axle will be disassembled after removal, place
a suitable receptacle under the axle (1) and wheel
hubs drain plugs (2). Remove the drain plugs and
allow the axle oil to drain into the receptacle.
Transfer the used axle oil into a suitable covered
container, and label the container as “Used Oil.”
Dispose of used oil at an approved recycling facility.
7. Label, disconnect and cap the steering and brake
lines at the axle. Wipe up any spilled oil.
8. Block the front and rear of both tires on the axle that
is not being removed. Ensure that the machine will
remain in place during axle removal before
proceeding.
9. Raise the machine using a suitable jack or hoist.
Place suitable supports under both sides of the
frame and lower the machine onto the supports.
Ensure that the machine will remain in place during
axle removal.
10. Support the axle that is being removed with a suitable
jack, hoist or overhead crane and sling. DO NOT
raise the axle or the machine.
11. Remove both wheel and tire assemblies from the
axle that is being removed. (Refer to Section 5.5.1,
“Removing Wheel and Tire Assembly from
Machine.”)
Note: The wheel and tire assemblies must be re-installed
later with the directional tread pattern “arrows” facing in
the direction of forward travel.
12. Remove the drive shaft assembly. Refer to Section
5.4.3, “Drive Shaft Removal.”
13. On the front axle remove the capscrew and locknuts
securing the lower position cylinder-mount pin to the
front cylinder. Tap the cylinder mount pin out, and
move the cylinder to prevent it from interfering with
axle removal.
14. Remove the bolts and locknuts securing the axle to
the frame.
15. Remove the axles from the machine using the jack,
hoist or overhead crane and sling supporting the
axle. DO NOT raise or otherwise disturb the
machine while removing the axle. Balance the axle
and prevent it from tipping, turning or falling while
removing it from beneath the machine. Place the
axle on a suitable support or holding stand.
5.3.6 Axle Installation
1. Before proceeding, ensure that the machine will
remain in place during axle installation. Block the
front and rear of both tires on the axle that is already
installed on the machine.
2. If applicable, raise the machine using a suitable jack
or hoist. Place suitable supports beneath the frame
and lower the machine onto the supports, allowing
enough room for axle installation. Ensure that the
machine will remain in place during axle installation.
MY4180
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