TM 9-2320-269-10
USING TRAILER EMERGENCY CONTROL - CONTINUED
Should a condition resulting In severe air loss from the truck or trailer air brake system be detected, or for any other
reason that should cause the operator to desire emergency application of the trailer brakes, he can pull the control to
EMERGENCY position. This will cause both the trailer service (1) and emergency brake lines (2) to be closed off at the
tractor protection valve. This can also be used as a means of checking operation of the trailer relay emergency valve
operation. Should a condition resulting in air loss occur which is not detected by the operator (and the two-way control
valve remains In the NORMAL position), the tractor protection valve will automatically close the air lines leading to the
trailer and apply the trailer brakes by actuating the relay emergency valve on the trailer. This will occur when the system
air pressure drops to about 30 to 40 psi (207 to 276 kPa).
The forward rear axle Is equipped with a power divider to drive the rear aft axle when additional traction is required. The
power divider Is used on sandy or soft muddy terrain, over rough terrain, and when fording, or pulling heavy loads.
NOTE
To prevent abnormal tire wear don't use the power divider unnecessarily.
Never move power divider control to lock IN position while rear wheels are slipping, to avoid
damaging the axle.
Always place power divider control to lock IN position at low slow speed, to avoid damage to
the axle.
TA 222576
2-80