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 896 of 1015

TM 9-2320-272-24-l

3-l95. SPRING BRAKE DASH CONTROL VALVE REPLACEMENT

THIS TASK COVERS:

a. Removal

b. Installation

INITIAL SETUP:

APPLICABLE MODELS

All

TOOLS

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

Toque wrench (Appendix E, Item 146)

MATERIALS/PARTS

Antiseize tape (Appendix C, Item 72)

REFERENCES (TM)

TM 9-2320-272-10

TM 9-2320-272-24P

EQUIPMENT CONDlTlON

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

Spring brake pressure switch removed

(para. 3-100).

GENERAL SAFETY INSTRUCTIONS

Do not disconnect air lines before draining air

reservoirs.

Do not disconnect air lines before draining air reservoirs. Small

parts under pressure may shoot out with high velocity, causing

injury to personnel.

Tag air lines for installation,

1.

Disconnect doublecheck valve air line (5) from elbow (4).

2.

Disconnect air line (3) from elbow (2).

3.

Remove pin (7) and valve knob (9) from dash control valve assembly (6).

4.

Remove nut (8) and dash control valve assembly (6) from instrument cluster (1).

6.

Remove elbows (2) and (4) from dash control valve assembly (6).

Wrap all male pipe threads with aniseize tape before installation,

1.

Install elbows (2) and (4) on dash control valve assembly (6).

2.

Install dash control valve assembly (6) on instrument cluster (1) with nut (8). Tighten nut (8)

150-300 lb-in. (17-34 N•m).

3.

Install valve knob (9) on dash control valve assembly (6) with pin (7).

4.

Connect air line (3) to elbow (2).

6.

Connect doublecheck valve air line (5) to elbow (4).

3-532