Navistar WorkStar Series, Operator'S Manual

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Operation
Mounting Height
Ground Axle
Load
10 in. 11 in. 12 in.
8,000 lbs 52 psi 56 psi 60 psi
9,000 lbs 60 psi 64 psi 69 psi
10,000 lbs 67 psi 72 psi 78 psi
11,000 lbs 75 psi 80 psi 87 psi
12,000 lbs 82 psi 88 psi 96 psi
13,000 lbs 90 psi 97 psi 105 psi
14,000 lbs 98 psi 105 psi 114 psi
1. This table is approximate. To obtain an accurate load vs. air
pressure reading, it is necessary that the unit be calibrated over a
flat and accurate scale.
2. These values are approximations and will vary, especially with
different mounting heights and or bag heights.
3. These Run Heights are based on units with no axle/bag shim
and a 3.50 in offset axle.
4. The values above are based on the standard axle assemblies
with bag heights of 12 in, 13 in, and 14 in respectively.
5. These weights are based on the axle and wheel equipment
weighing 1200 lbs ground weight with no (0 psi) air pressure.
Brakes
WARNING
Always check and maintain brakes in proper
condition and adjustment.
Out of adjustment
brakes could cause reduced braking ability and
result in property damage, personal injury, or
death.
Downhill Operation
WARNING
Do not attempt to gear down if the engine is
at or near maximum speed (RPM). Under these
conditions it will be impossible to shift into a
lower gear and could result in possible vehicle
runaway, resulting in property damage, personal
injury, or death.
Always descend hills with extreme care, relying primarily on the
engine braking effect to control vehicle speed. Heed warning
signs posted for any grade. Stop and check brakes for condition
and adjustment at available pull-off areas before starting a
descent.
Observe the following precautions:
• Never coast downhill. Service brakes alone should not be
used to control speed on major downgrades. Brakes will
fade from overuse.
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