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 410 of 481

TM 9-2320-272-10

3-17. EMERGENCY BRAKE SERVICE

a. General.

The emergency brake combines the holding strength of the spring

brake system (activated by a switch on emergency brake lever), with brake shoes

attached to the output shaft of the transfer case.

b. Operation.

The emergency brake can be applied simply by pulling the emer-

gency brake (3) backward and upward at the same time until it is in the full upright

position.

c. Testing With Engine Running (para. 2-12).

(1)

With service brake (5) applied, depress override button (2) on dash.

(2)

Set emergency brake. Make sure parking brake warning light (6) illumi-

nates.

(3)

Shift transmission selector (1) to 1-5 drive.

(4)

With engine at idle speed, release service brakes (5). If vehicle moves,

adjust emergency brake (3).

d. Adjusting Emergency Brake.

(1)

With emergency brake (3) off (forward and down position), rotate knurled

knob (4) clockwise one-quarter turn.

(2)

Repeat testing procedure and step (1) until emergency brake holds vehicle

at idle. Rotate knurled knob (4) an additional one-quarter turn.

CAUTION

If emergency brake cannot be adjusted, or drags when released, notify

unit maintenance. Failure to do so may result in damage to equipment.

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