Navistar WorkStar Series, Operator'S Manual

Page: 183 / 258

Maintenance Instructions
Alignment
Maintaining front axle alignment is very important to achieving
maximum tire life and vehicle control. Inspecting steer axle tires
daily will generally show if tires are wearing normally.
• Rapid outside shoulder wear on both tires indicates too
much toe-in.
• Rapid inside shoulder wear on both tires indicates too much
toe-out.
• Excessive wear on the inside or outside of one steer tire,
but not the other, can indicate a toe-in or toe-out condition
coupled with a misaligned front or rear axle.
• Pulling to the right or left can indicate misalignment
of the front or rear axle, unequal tire pressures, or a
damaged/mismatched tire.
Refer to the Tires subsection for additional related information.
Front Drive Axle and Transfer Case (Optional)
Inspection and Lubrication
In addition to the checks outlined for the non-drive front axle,
proper lubrication and inspections of the front drive components
must be followed. Both the front drive axle and the transfer case
oil level must be checked periodically and also inspected for
possible oil loss. The proper lubrication level is to the bottom
of the ’oil fill hole’ with the vehicle on level ground.
Make sure the axle mounting U-bolt nuts, attaching or mounting
bolts and nuts, are securely tightened. Loose or misaligned rear
axles will affect vehicle alignment, front tire wear, and handling.
Re-torque the U-bolt nuts after the first 1,000 miles (1,600 km)
and every 36,000 miles (58,000 km) thereafter. Refer to the
LUBRICATION AND MAINTENANCE INTERVAL CHART for
recommended service intervals.
Rear Axle – Inspection and Lubrication
Make sure the axle mounting U-bolt nuts, attaching or mounting
bolts and nuts, are securely tightened. Loose or misaligned
rear axles will affect vehicle alignment, tire wear, and handling.
Refer to AXLE U-BOLT NUT TORQUE CHART for torque
specifications.
Check the rear axle oil level. Proper oil level minimizes gear
wear, heat, and damage to the wheel bearings and seals. The
oil level should be at the lower edge of the oil fill hole when the
vehicle is on level ground. Add oil as necessary.
Refer to the LUBRICATION AND MAINTENANCE INTERVAL
CHART and the LUBRICANT AND SEALER SPECIFICATIONS
CHART for additional information.
Lift Axle System
WARNING
Always lower lift axles before servicing the
axle, controls, or air lines. Failure to follow this
warning may cause a sudden loss of air pressure
and the unintentional lowering of the lift axle
resulting in property damage, personal injury, or
death.
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