TM 9-2320-272-24-l
l-20. CONTROL SYSTEM OPERATION (Contd)
Key Item and Function
1 TRANSFER CASE SHIFT LEVER SWITCH - When depressed with transmission in NEUTRAL,
lockup solenoid.
2 TRANSFER CASE SHIFT LEVER - Is pushed down to HIGH for light load operations, and up to
LOW for heavy load operations. Six-wheel drive is achieved automatically when transfer case shift
lever is placed in LOW.
3 TRANSFER CASE PTO CONTROL LEVER - Manual control for engaging PTO.
4 TRANSFER CASE PTO - Mounted and mechanically driven at rear of transfer case, the PTO
drives a pump to supply hydraulic pressure to power the rear winch and crane on the M936/A1/A2
wreckers.
5 FRONT-WHEEL DRIVE LOCK-IN SWITCH - Manual control for activating front-wheel drive
valve to provide front-wheel drive with transfer case in HIGH drive range.
6
INTERLOCK AIR CYLINDER - Under air pressure, a piston in the interlock air cylinder forces a
shaft against one of three grooves in transfer case shift lever, This prevents transfer case from being
shifted with transmission in gear.
7
in NEUTRAL and transfer case shift lever switch is depressed. This permits the transfer case
high/low shift shaft to move.
8
FRONT-WHEEL DRIVE AIR CYLINDER - When under pressure, it moves transfer case clutch
forward to engage front-wheel drive.
9
FRONT-WHEEL DRIVE VALVE - When tripped by a cam on transfer case shift shaft, the front-
wheel drive valve routes air to front-wheel drive air cylinder.
1-33
