JLG G6-42A Service Manual - Manual (Page 92)

Axles, Drive Shafts, Wheels and Tires
5-4 G6-42A, G9-43A, G10-43A
PERIODIC OPERATION REQUIREMENT: Every two
weeks, drive the machine far enough to cause the drive-
train components to make several complete revolutions.
This will help ensure that internal components receive
lubrication to minimize deterioration caused by
environmental factors such as high humidity.
SUBMERSION: If the machine has been exposed to
water deep enough to cover the hubs, disassemble the
wheel ends and inspect for water damage and
contamination. If the carrier housing was submerged in
water, especially if the water level was above the vent
tube (breather), drain the axle and inspect internal parts
for water damage and contamination. Before assembling
and refilling the unit with the specified lubricant(s), clean,
examine and replace damaged parts as necessary.
Note: Use a suitable puller for bearing removal. Clean,
inspect and lubricate all bearings just prior to
reassembly. If replacement of a damaged bearing cup or
cone is necessary, replace the cup and cone as a set.
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 the stabilizer
solenoids and other 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.
3. Open the engine cover. Allow the system fluids to
cool.
4. Properly disconnect the battery.
5. 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.
Note: Rotate the wheel hubs until the drain plugs are
facing down.
6. Label, disconnect and cap the steering and brake
lines at the axle. Wipe up any spilled oil.
7. 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.
8. 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.
9. 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.
10. 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.
11. Remove the drive shaft assembly. Refer to Section
5.4.3, “Drive Shaft Removal.”
12. 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.
13. Remove the bolts and locknuts securing the axle to
the frame.
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