UNDERCARRIAGE RT880E SERVICE MANUAL
8-4 Published 11-10-2014, Control # 524-00
Wheels and Tires
Description
The standard tire size for this unit is 29.5 x 25-34 ply.
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. Position the wheel assembly on the mounting studs.
Install the lug nuts and tighten them to 50 lb-ft (70 Nm) in
the sequence shown in (Figure 8-2).
2. Ensure the wheel assembly is positioned properly on the
hub.
3. Torque the lug nuts 340 to 360 lb-ft (461 to 488 Nm) in
the sequence shown in Figure 8-2.
4. Retorque lug nuts after approximately one hour of travel.
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.
FIGURE 8-2
1
2
3
5
9
13
17
21
7
11
15
19
236
10
14
18
22
4
8
12
16
20
24
Wheel End Horizontal Oil Fill Level and Drain Plug
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