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 348 of 481

TM 9-2320-272-10

2-239

a.

General.

Airbrake control kit is installed on vehicles hauling trailers or

artillery equipped with airbrakes. Airbrake kit is installed by direct support mainte-

nance.

b.

Airbrake Kit Operation.

NOTE

Inserting yoke of equipment

requires two or more

crewmembers, depending on

size and weight of load.

(1)

Insert yoke (7) of

equipment to be towed into pintle

hook (4) of vehicle.

(2)

Connect air lines from

towed equipment to half couplings

(5) of towing vehicle.

(3)

Pull up handles (6) to

open airbrake hose lines.

(4)

Connect trailer brake-

light cable (3) to electric receptacle above pintle hook (4).

(5)

Start engine (para. 2-12).

2-47. AIRBRAKE CONTROL KIT

(6)

Press in trailer air sup-

ply valve control knob (9) and hold

in place for 15 seconds. Release

valve control knob (9). Valve control

knob (9) should remain in pressed-in

position indicating trailer or

artillery load airbrake system has

proper air pressure.

NOTE

Airbrake hand control

should be engaged slowly

to provide steady, even

braking.

(7)

Pull down trailer air-

brake hand control lever (8) to apply

brakes of towed load.