Navistar WorkStar Series, Operator'S Manual

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Maintenance Instructions
Axles
Front Axle
Inspection and Lubrication
Check to make sure that the front axle mounting U-bolts,
attaching or mounting bolts and nuts are securely tightened.
Loose or misaligned front 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.
Observe the following when checking the front axle for damaged,
binding, or worn parts, and adequate lubrication:
• Kingpin wear inspection requires that no weight is on the
tires.
• Kingpin and kingpin bushing lubrication requires that the
vehicle weight is off tires and the front wheels be turned fully
to the left or right prior to installing grease distribution.
• Kingpin thrust bushing lubrication requires that the vehicle
weight is resting on the tires.
Therefore, add additional
grease to the lower kingpin grease zerk after vehicle weight
is once again resting on the tires.
• Power grease guns may be used: however, a hand-pumped
grease gun is recommended for optimal grease distribution
within each component joint.
• Inspect, lubricate and adjust the wheel bearings at regular
intervals.
Refer to SECTION 7 — MAINTENANCE
INTERVALS AND SPECIFICATIONS for the correct
intervals, lubricants, and torques.
Normal Maintenance
During operation, the air and oil inside the hub/wheel cavity
expands.
It is normal for a mist of oil to be present on the
outside of the hubcap around the vent slit or hole. Over time,
if not wiped off, this film may collect dust and appear unsightly.
If the entire face and end of the hubcap become wet with oil,
investigate the cause. Refer to the Service Manual axle section
for repair procedures.
Routinely clean the hubcap to ensure that the lubricant level
can be easily observed through the clear window as intended.
In situations where the window is clean on the outside but
discolored on the inside, check the lubricant level by removing
the rubber fill/vent plug and insert a finger into the hole.
The specified lubricant level for International® clear window type
hubcaps is from the minimum line to 5/16 inch (7.9 mm) above
the minimum line.
If the lubricant level suddenly drops dramatically below the
minimum level, see the Service Manual for diagnostic procedure.
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