OPERATION UNDER UNUSUAL CONDITIONS - CONTINUED
TOW TRUCK - CONTINUED
When front axle of truck being towed is lifted off the ground, disconnect universal
joint on propeller shaft (at the input to the forward-rear axle) and tie it to vehicle
When rear tandem axles of truck being towed are lifted off ground, ensure inter-axle
lockout control valve lever is in UNLOCKED position.
Brakes will be released when air is applied to a disabled vehicle. DO NOT
connect air lines to a disabled vehicle without first blocking wheels and con-
necting tow bar between vehicles. Failure to follow this warning could result
in death or injury to personnel and damage to equipment.
Towing vehicle speed should not exceed 15 mph (24 kph) on primary roads
and 8 mph (13 kph) on secondary roads. For cross-country towing, all tires of
disabled truck should be on ground.
Install medium duty tow bar at towing vehicle pintle and disabled truck towing
eyes. Ensure tow bar is long enough to allow complete turning radius.
Connect air pressure hoses between disabled truck and towing vehicle.
Release parking brakes and turn appropriate lights on.
CAGE AND UNCAGE BRAKES
Cage Brakes. In the event of an air pressure loss, spring brakes on the tandem rear axles
will apply the brakes. If the vehicle must be towed and there is not enough air system
pressure to compress the power spring in the spring brake chambers to release the brakes,
compress them manually. Each vehicle has four spring brakes.