TM-9-2320-272-10

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; OPERATOR'S MANUAL

SEPTEMBER 2004

CHANGE 2

TM-9-2320-272-10 - Page 111 of 481

TM 9-2320-272-10

2-12

2-3. CHASSIS CONTROLS AND INDICATORS (Contd)

6

FUEL TANK FILLER CAP is turned counterclockwise and removed for fuel

servicing.

7

PRIMARY DRAINVALVE, located on right side of vehicle, is turned

counterclockwise to drain water from primary brake system air reservoir.

8

SECONDARY DRAINVALVE, located on right side of vehicle, is turned

counterclockwise to drain water from secondary brake system air reservoir.

9

WET TANK DRAINVALVE, located on right side of vehicle, is turned

counterclockwise to drain water from brake system wet tank air reservoir.

10

SPRING BRAKE DRAINVALVE, located on right side of vehicle, is turned

counterclockwise to drain water from spring brake system air reservoir.

11

TOOLBOX LATCH HANDLE is turned up to unlatch and open toolbox.

12

SLAVE RECEPTACLE, located on right rear side of cab, is plug-in point for

an external power source required to slave start vehicle when batteries have

become discharged.

Key

Item and Function

1

PERSONNEL HEATER VENTVALVE, located in engine compartment, is

turned counterclockwise to purge personnel hot water heater of air.

2

WINDSHIELD WIPER MOTOR, located on each front window, powers

windshield wipers.

3

WING NUT, located on each side of window, is tightened to hold window in

open position.

4

LATCHING HANDLE secures window in closed position.

5

WARNING ALARM BUZZER is located above left cowl vent. The alarm

sounds when airbrake system pressure drops below 50-60 psi (345-414 kPa)

or when parking brake is engaged.