8-4 Published 11-22-2016, Control # 345-12
UNDERCARRIAGE RT9130E-2 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
proper 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 lb-ft (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 340 to 360 lb-ft (461 to 488 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 340 to 360 lb-ft (461
to 488 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.
WARNING
Possible equipment damage and/or
personal injury!
Driving the crane with a tire under inflated at 80% or less
of its recommended pressure can cause the wheel and/or
tire to fail. Per OSHA Standard 1910.177(f)(2), when a tire
has been driven under inflated at 80% or less of its
recommended pressure, it must first be completely
deflated, removed from the axle, disassembled, and
inspected before re-inflation.
WARNING
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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