TOW TRUCK (Con't).
When front axle of truck being towed is lifted off the ground, disconnect
universal joint on propeller lever (at the input to the forward-rear axle) and tie it up to vehicle
When rear tandem axles of truck being towed are lifted off ground, ensure
interaxle 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 blocking wheels
and connecting tow bar between vehicles. Failure to follow this
warning could result in death or injury to personnel and damage to
Towing vehicle speed should not exceed 15 mph on primary roads and
8 mph 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.
· Brake chamber contains spring under great pressure. To prevent
personnel injury, never work directly behind chamber. If caging bolt
will not engage properly, spring may be broken.
· Do not remove clamp ring around spring brake chamber. It is under
tension and can cause personnel injury if released.
· When spring brakes are applied, vehicle will stop quickly which could
result in injury to personnel. Also, vehicle cannot be driven again
until malfunction is repaired and enough air supply is present for
operation of service brakes.