TM-9-2320-272-24-1

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4

JUNE 1998

TM-9-2320-272-24-1 - Page 842 of 1015

TM 9-2320-272-24-1

3-172. PARKING BRAKE ADJUSTMENT

THIS TASK COVERS:

a. Test

b. Minor Adjustment

c. Major Adjustment

d. Lever Arm Adjustment

INITIAL SETUP

APPLICABLE MODELS

All

TOOLS

EQUIPMENT CONDITION

Wheels chocked (task c. only) (TM 9-2320-272-10).

Parking brake disengaged (TM 9-2320-272-10).

Transfer case shift lever in neutral

General mechanic’s tool kit (Appendix E, Item 1)

(TM 9-2320-272-10).

REFERENCES (TM)

Transmission in neutral (TM 9-2320-272-10).

TM 9-2320-272-10

Transfer case-to-forward rear axle propeller shaft

removed (task c. only) (para. 3-150 or 3-151).

1.

Start engine (TM 9-2320-272-10) and observe air pressure gauge (5) located inside vehicle cab until

air pressure builds to 90 psi (621 kPa).

2.

Pull parking brake lever (3) up to engage.

3.

Push in spring brake release control (6) on instrument panel (1) to release spring brakes.

4.

Place transmission selector lever (4) in 1-5 (drive). If vehicle moves, perform task c.

Turn parking brake adjusting cap (2) clockwise to increase; counterclockwise to decrease braking action.

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