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 118 of 481

TM 9-2320-272-10

2-19

2-4. BODY EQUIPMENT CONTROLS AND INDICATORS (Contd)

9

TAILGATE LATCHES unlock when tailgate control lever (3) is pulled

forward. Latches lock tailgate when control lever (3) is pushed back.

10

DUMP BODY SUPPORT BRACES hold dump body in up position for safety

during maintenance or cleaning of dump body underside.

11

BRACKETS hold dump body support braces (10) when not in use.

c. Tractor.

Key

Item and Function

12

ELECTRICAL CABLE AND CONNECTOR provides electrical power to

semitrailer.

13

EMERGENCY AIRBRAKE HOSE AND COUPLING connect to the

emergency airbrake coupling on the semitrailer. Semitrailer emergency

brake system is activated when the service airbrakes fail.

14

SERVICE AIRBRAKE HOSE AND COUPLING connect to the service air

coupling on the semitrailer.

15

AIRBRAKE HOSE COUPLING SHUTOFF VALVES are placed in the down

(open) position to release compressed air to the semitrailer.

16

LOCKING PLUNGER HANDLE

is pulled forward, then out to unlock fifth

wheel coupling jaws (17).

17

FIFTH WHEEL COUPLING JAWS lock the semitrailer kingpin into the

tractor fifth wheel.