JLG 723A Service Manual - Manual (Page 58)

Axles, Drive Shafts, Wheels and Tires
5-4 L2906H, 2906H, 3507H, 619A, 723A, 29.6LP, 29.6, 35.7
5.4.4 Axle Removal
The front and rear axle assemblies differ in that the front
axle assembly is equipped with a hydraulic drive pump,
parking brake mechanism and a limited-slip feature; the
rear axle has none of these. 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.
IMPORTANT: 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, fully
retract the boom, lower the boom, place the
transmission control lever in (N) NEUTRAL, engage
the park brake 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. If the axle will be disassembled after removal, place
a suitable receptacle under the axle (1) and wheel
hubs (2) drain plugs. 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 the used oil at an approved recycling
facility.
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. Mark and remove both wheel and tire assemblies
from the axle that is being removed. (Refer to
Section 5.6.1, “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
5.5.3, “Drive Shaft Removal.”)
12. Remove the capscrews, locknuts and axle plates
securing the axle to the frame.
13. Remove the axle 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.
5.4.5 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.
WARNING
Safely raise and adequately support the machine so
that it will remain stable and in place before attempting
to remove an axle.
MAH0440
1
MAH0990
2