8-4 Published 08-25-09, Control # 077-04
UNDERCARRIAGE RT9130E SERVICE MANUAL
WHEELS AND TIRES
Description
The standard tire size for this unit is 33.25 x 29-38 ply; also
available as an option, is a 29.5R29 tire.
Each wheel assembly (tire and rim) is mounted on the
planetary hub with 24 grade 8 lug nuts.
NOTE: The tire diameters, widths, and weights may vary
slightly depending on the tire manufacturer.
Off-highway tires are designed to operate with a certain
sidewall deflection or bulge. Correct air pressure ensures
prior deflection which, in turn, ensures proper traction,
flotation, support of load, and prevents excessive flexing of
the tire. Over inflation increases rim stresses, which results
in lowered rim life.
Refer to and adhere to the inflation pressures in the Load
Chart Book in the crane cab.
Maintenance
Mounting Wheel Assemblies
NOTE: Do not lubricate the wheel studs or lug nuts.
1. Raise the crane on outriggers so the wheels are off the
ground.
2. The 29.5R29 tire and wheel is a directional assembly.
These tires must be properly oriented on the left hand or
right hand side of the crane.
3. Install the wheel assembly on the mounting studs. Install
the lug nuts and tighten them to 50 foot-pounds (68 Nm)
in the sequence shown in (Figure 8-2).
4. Ensure the wheel assembly is properly on the hub.
5. Torque the lug nuts to 380 to 400 foot-pounds (515 to
542 Nm) in the sequence shown in (Figure 8-2).
6. Lower the crane onto its tires. Retract and stow the
outrigger assemblies and the floats.
7. Road-test the tire, then retorque to 380 to 400 foot-
pounds (515 to 542 Nm). Maintain proper torque on
wheel lugs and check for proper wheel mounting.
Retorque the lug nuts after about an hour of travel after
the wheels are removed and reinstalled. This will reseat
the lug nuts. Check the torque every 500 miles (800 km)
thereafter.
CAUTION
Do not mix tires and rims of different manufacturers.
DANGER
Do not attempt to demount or mount tires without proper
training. The high pressures involved can cause tire and
rim parts and tools to fly with explosive force, if proper
procedures are not used, causing severe injury or death
to personnel and damage to the crane and surrounding
area.
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