8-2 Published 11-22-2016, Control # 345-12
UNDERCARRIAGE RT9130E-2 SERVICE MANUAL
MAINTENANCE
NOTE: The axles do not have to be removed from the
crane to remove the planetary wheel ends or the
drive units.
Removal
1. Using the outriggers, raise the wheels off the ground.
2. Install blocking under the frame at the outboard ends of
the four outrigger boxes.
3. Disconnect and remove the drive line from the
applicable axle. Do not disassemble the drive lines.
Refer to Drive Lines, page 7-25.
4. Tag, disconnect, and cap the hydraulic brake line at
each wheel.
5. Tag, disconnect, and cap the hydraulic lines to the steer
cylinders.
6. On the front axle only, tag and disconnect the hydraulic
line from the park brake actuator.
7. On the right side of the rear axle only, tag and disconnect
the electrical wires from the rear wheels not centered
switch.
8. On machines equipped with cross-axle differential locks
remove hoses and wires from the differentials.
NOTE: Each tire and wheel assembly weighs
approximately 2400 lb (1089 kg).
9. Remove the wheels from the axle.
NOTE: Each axle weighs approximately 6050 lb (2750 kg)
with oil. Refer to in this section.
10. Position jacks, which are capable of handling the weight
of the axle, under the axle for support.
11. Remove the eight nuts, washers, and bolts securing the
axle to the frame/cradle.
12. Lower the axle to the ground and remove it to a clean
working area.
Cleaning
Completely assembled axles may be steam cleaned on the
outside only, to facilitate initial removal and disassembly,
providing all openings are closed. Breathers, vented shift
units, and all other openings should be tightly covered or
closed to prevent the possibility of water entering the
assembly.
Installation
1. If a new axle is to be installed, remove the following from
the old axle and install them on the new one.
a. The steer cylinders.
b. The rear wheels not centered switch actuator
bracket (rear axle only).
c. The parking brake actuator (front axle only). Refer
to Brake System, page 8-12 in this section.
2. Position the axle under the crane on jacks which are
capable of handling the weight of the axle.
3. Raise the axle into place and secure with the eight
attaching bolts, washers, and nuts. Torque the bolts to
1885 to 2043 lb-ft (2556 to 2770 Nm).
4. Install the wheels onto the axle. Refer to Wheels and
Tires, page 8-4 in this section.
5. Connect the hydraulic lines to the steer cylinder as
tagged during removal.
6. Connect the hydraulic brake line to each wheel as
marked during removal.
7. On the front axle only, connect the hydraulic line to the
parking brake actuator.
8. On the right side of the rear axle only, connect the
electrical wires to the rear wheels not centered switch.
Refer to Rear Wheels Not Centered Switch Adjustment
Procedure, page 8-3 and adjust the switch.
9. Connect the drive line to the applicable axle. Refer to
Drive Lines, page 7-25.
10. Reconnect differential lock hoses and wires if
applicable.
11. Refer to Brake System, page 8-12 in this section and
bleed the hydraulic brake system.
12. Remove the blocking under the outrigger beams and
retract the outriggers to lower the wheels to the ground.
Wheel Alignment Check Procedure
1. Check the axle for wheel alignment. The wheels are to
be straight ahead with no toe-in or toe-out. Adjust if
necessary by turning the tie rod ends in the direction
necessary.
2. Check pre-set axle stop by turning the wheels to the
extreme left. Check the clearance between the inside of
the tire and the nearest object. If the clearance is less
than 1.0 in (25.4 mm), adjust the axle stop to provide
clearance.
CAUTION
Do not disassemble drive lines when removing them from
the crane. Dirt can enter the spline and cannot be purged.
In addition, the drive lines are assembled in a specific
orientation when manufactured and can easily be
incorrectly reassembled.
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