JLG 534D-10 - Manual (Page 94)

Axles, Wheels and Tires
5.10 534D-9, 534D-10 & 544D
5.5 REAR STEER AXLE
5.5.1 Rear Axle Removal
The rear steer axle assembly is equipped with two steer
cylinders, two drive hubs and two motors and can be
removed as a complete assembly. The following steps
outline a typical axle removal procedure.
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, stating that the machine
should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Remove the battery negative (-) cable from the
battery negative (-) terminal.
Note: If removing rear drive motors, refer to Section
8.7.2, “Rear Drive Motors.” If removing rear drive hubs,
refer to Section 5.4.1, “Rear Drive Hub Service.”
5. Label, disconnect and cap the hoses on both drive
motors and on both steer cylinders. Wipe up any
spilled oil.
6. Block the front and rear of both tires on the front
axle. Ensure that the machine will remain in place
during axle removal before proceeding.
7. 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.
8. Support the rear axle with a suitable jack, hoist or
overhead crane and sling. DO NOT raise the axle or
the machine.
9. 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.
10. On the rear axle, remove the retaining pin (2)
securing the stabilizer cylinder pin to the frame. Tap
the pin out, and move the cylinder to prevent it from
interfering with axle removal.
Note: The stabilizer cylinder is standard equipment on
the 544D and optional equipment on the 535D-9 &
534D-10.
11. Remove the bolt and locknut (3) securing the axle
pivot pin to the frame. Tap the pivot pin (4) out and
note the location of the shims (5) on each side of the
axle.
12. 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.
5.5.2 Rear 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 front axle.
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.
3. Using a suitable jack, hoist or overhead crane and
sling, remove the axle from its support or holding
stand. Balance the axle and prevent it from tipping,
turning or falling while positioning it beneath the
machine. DO NOT raise or otherwise disturb the
machine while installing the axle. Keep the axle
supported and balanced on the jack, hoist or
overhead crane and sling throughout the installation
procedure.
MX0660
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