from leaking out, and will keep contaminants
from getting into and damaging the wheel bear-
ings and axle lubricant.
NOTICE
Failure to protect the frame rails from the chains
could cause damage, leading to eventual frame
failure.
4.
On dual drive axles, if the vehicle is to be lifted
and towed, chain the forward rear-axle assembly
to the vehicle frame; use protection to keep the
chains from damaging the frame.
5.
Remove the bumper extension and chrome bum-
per, if so equipped. Remove the bumper fairing,
if so equipped.
6.
On vehicles equipped with an air fairing, adjust
the trim tab to the lowest position.
NOTICE
Do not pass a sling (for example, a rope or chain)
from one tow hook to another to fasten for tow-
ing. Known as reeving, this practice is not per-
missible in most industrial applications of towing
and hoisting. Reeving can overload the hooks
and result in damage to the vehicle.
7.
Attach the towing device. Due to the many vari-
ables that exist in towing, positioning the lifting
and towing device is the sole responsibility of the
towing-vehicle operator.
8.
On vehicles equipped with an air fairing, mea-
sure the distance from the ground to the bumper,
or from the ground to a frame bracket.
9.
Lift the vehicle, and secure the safety chains. If
extra towing clearance is needed, remove the
front wheels.
WARNING
Failure to lower the vehicle could result in the air
fairing striking an overhead obstruction, such as
a bridge or overpass, and causing vehicle dam-
age or personal injury.
10.
On vehicles equipped with an air fairing, repeat
the measurement taken in step 8. The difference
between the two measurements must not exceed
14 inches (36 cm). If necessary, lower the ve-
hicle.
11.
Connect the clearance lights, taillights, and sig-
nal lights. Connect any special towing lights re-
quired by local regulations.
WARNING
Failure to chock the tires or connect the tow
truck’s air brake system before releasing the
spring parking brakes could allow the disabled
vehicle to suddenly roll. This could cause prop-
erty damage or personal injury.
12.
Chock the disabled vehicle’s tires, and connect
the towing vehicle’s air brake system to the ve-
hicle being towed. Then, release the spring park-
ing brakes and remove the chocks.
Rear Towing Hookup
NOTICE
Using a rear towing hookup on a vehicle
equipped with a roof fairing could cause damage
to the cab structure.
If reverse towing at speeds above 45 mph (70
kph) is necessary, hold down the cab with ten-
sion straps looped over the cab shocks and
under the frame rails. Failure to do so could
allow the wind load to lift the cab unexpectedly,
resulting in damage to the air springs and other
components.
1.
If the vehicle is equipped with cab air suspen-
sion, and reverse towing at speeds above 45
mph (70 kph) is necessary, hold down the cab as
follows:
1.1
Drain the air from the cab air springs.
1.2
Loop a 2-inch (5-cm) ratchet-style tension
strap (rated 2000 lb [900 kg] minimum
work load) over the top of the cab shock
and under the frame rail. Tighten the strap
for a snug fit. If the cab is equipped with
two or more shocks, restrain the aftmost
shock on each side of the vehicle.
2.
Place the front tires straight forward and secure
the steering wheel in this position.
3.
Disconnect the battery ground cables.
In an Emergency
21.5
To Next Page
Loading...
Need help?
General
