Navistar WorkStar Series, Operator'S Manual

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Operation
NOTE: Important factors to keep in mind when using tow hooks:
• use both tow hooks when retrieving vehicle
• use a slow steady pull, do not jerk on hooks
• tow hooks are not designed for towing, retrieval only
Before moving the towed vehicle, check for adequate road
clearance of vehicle components. Unload the towed vehicle
prior to towing to reduce any abnormal loads to the vehicle
components resulting from the towing procedures.
Before
towing, be sure to fully release the parking brake. The
spring-actuated type parking brake can be released by
recharging the air system with at least 64 psi (441 kPa) of
air. If brake system will not retain air pressure, then the spring
brakes must be held in the released position (caged) manually.
See Parking Brake section.
Towing Vehicle with Front Wheels Suspended
CAUTION
To prevent vehicle, engine, or transmission
damage, vehicles should not be towed, even
short distances, without suspending rear wheels
or removing the axle shafts or propeller shaft.
In the event the chassis is equipped with tandem
axle and the vehicle is to be towed from the front,
the forward rear axle may be raised to clear the
road surface and secured to the frame by chains
or U-bolts, allowing only rear axle to contact
road surface. Axle shafts must be removed from
rear axle assembly. The wheel hub ends must
be covered to prevent loss of axle lubricant and
entrance of contaminants.
Use extreme care
in securing the chains or U-bolts to prevent
possible damage of brake lines, hoses or other
components.
When it is necessary to tow a vehicle with the front wheels
suspended,
extra precautions must be taken to avoid
transmission or differential damage. Proceed as follows.
Remove axle shafts from axle assembly to prevent the wheels
from driving the differential and the transmission. The wheel
hub ends must be covered to prevent loss of axle lubricant
and entrance of contaminants. If axle shafts are not removed,
removal of propeller shafts at rear axle will be required.
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