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 902 of 1015

TM 9-2320-272-24-l

3-197. BRAKE PEDAL (TREADLE) VALVE REPLACEMENT (Contd)

7.

Remove air hoses (3), (4), and (6) from adapters (2), (5), and (7).

8.

Remove adapters (2), (5), and (7) from firewall (8).

9.

Remove three locknuts (1) and brake pedal valve (9) from firewall (8). Discard locknuts (1).

10.

Remove three studs (10) from brake pedal valve (9).

11.

Remove two brake pedal valve adapters (12) from brake pedal valve (9).

12.

Remove pressure relief valve (11) from brake pedal valve (9).

If new brake pedal valve is being installed, use attaching parts

and fittings from old brake pedal valve.

Fittings must be cleaned and inspected for cracks and stripped

threads.

Wrap all male pipe threads with antiseize tape before

installation.

1.

Install pressure relief valve (11) in brake pedal valve (9).

2.

Install two brake pedal valve adapters (12) in brake pedal valve (9).

3.

Install three studs (10) in brake pedal valve (9).

4.

Install brake pedal valve (9) on firewall (8) with three new locknuts (1).

5.

Install adapters (2), (5), and (7) on firewall (8).

6.

Install air hoses (3), (4), and (6) on adapters (2), (5), and (7).

7.

Install pipe (20) and tee (19) on firewall (8).

8.

Install adapter (15) on firewall (8).

9.

Connect air hose (16) to adapter (15).

10.

Install adapters (14) and (18) on tee (19).

11.

Connect air hoses (13) and (17) to adapters (14) and (18).

12.

Connect two air lines (21) to brake pedal valve adapters (22).

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