UNDERCARRIAGE GRT9165 SERVICE MANUAL
8-4
Published 10-01-2020 Control # 699-00
Axle 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. For more information, see Steer
Cylinders, page 8-11.
b. The rear wheels not centered switch actuator
brackets (rear axles only). For more information,
see Rear Steer Sensor Adjustment Procedure, page
8-7.
c. The parking brake actuator (front axle only). Refer
to Brake System, page 8-13 in this section.
NOTE: The front axle weighs approximately 2036 kg
(4489 lb). The middle axle weighs approximately
1754 kg (3867 lb). The rear axle weighs
approximately 2000 kg (4409 lb).
2. Install the front axle (1, Figure 8-3) as follows:
a. Position the axle under the crane on jacks which are
capable of handling the weight of the axle.
b. Raise the axle into place and secure with the eight
attaching capscrews (10) and washers (9). Torque
capscrews. For more information, see Fasteners
and Torque Values, page 1-16 for proper torque
value.
3. Install the middle (2) and rear (3) axles as follows:
a. Install the strut cylinder to the frame with spacers
(7), suspension pins (8), and cotter pins (6).
b. Connect the drag link assembly (5) to the middle (2)
or rear (3) axle. Apply Loctite® 243 or equivalent to
drag link clamp capscrews. Torque ball joints from
332 N-m to 366 N-m (240 ft-lbs to 270 ft-lbs).
c. Apply Loctite® 243 or equivalent to capscrews and
connect torque rods (4) to middle (2) or rear (3) axle.
Torque the capscrews. For more information, see
Fasteners and Torque Values, page 1-16.
d. Synchronize the rear axle drag links. For more
information about synchronizing the rear axle drag
links, see Rear Axle Drag Link Synchronization,
page 8-4.
4. Install the wheels onto the axle. Refer to Wheels And
Tires, page 8-7 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 left side of the rear axle only, connect the
electrical wires to the rear wheels not centered switch.
Adjust the switch as outlined under, Rear Steer Sensor
Adjustment Procedure, page 8-7.
9. Connect the drive line to the applicable axle. Refer to
Drive Shafts, page 7-28.
10. Refer to Brake System, page 8-13 and bleed the
hydraulic brake system.
11. Remove the blocking under the frame and retract the
outriggers to lower the crane to the ground.
Front 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 as follows:
a. Turn the wheels to the extreme left.
b. Check the clearance between the inside of the tire
and the nearest object.
c. Clearance should be 25.4 mm (1.00 in) minimum, If
necessary, adjust the axle stop to provide
clearance.
3. Turn axle to extreme right and repeat step 2.
Rear Axle Drag Link Synchronization
NOTE: For best results, synchronize the rear axle links
when the tires are removed.
1. Extend the rear outrigger jack cylinders to raise the rear
axles off of the ground. The front tires should remain on
the road. Raising the rear outriggers this way enables
the adjustment of the drag links without damage.
2. Place jacks under the rear axles as necessary.
3. If the axle was replaced, loosen the fittings on each steer
cylinder. Turn the steering wheel lock to lock. Bleed
cylinders until no air appears. Tighten fittings.
4. Raise the rear of unit 38 mm (1.50 inches) from the ride
height as follows:
CAUTION
Do not attempt to adjust the axle drag links or the tie rod
ends while the full weight of the crane is on the axles.
Failure to do so may result in component damage.
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