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 892 of 1015

TM 9-2320-272-24-1

3-193. SPRING (EMERGENCY) BRAKE CHAMBER MAINTENANCE

THIS TASK COVERS:

a. Disassembly

c. Assembly

b. Inspection

INITIAL SETUP:

APPLICABLE MODELS

EQUIPMENT CONDITION

All

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

TOOLS

Air reservoirs drained (TM 9-2320-272-10).

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

GENERAL

SAFETY INSTRUCTIONS

Torque wrench (Appendix E, Item 146)

Do not disconnect air lines before draining air

REFERENCES (TM)

TM 9-2320-272-10

TM 9-2320-272-24P

reservoirs.

Do not disconnect air lines before draining air reservoirs. Small

parts under pressure may shoot out with high velocity, causing

injury to personnel.

1.

Remove tube (1) from elbow (2).

2.

Remove tube (10) from elbow (9).

3.

Remove nut (7), screw (6), clamp (3), and housing assembly (8) from nonpressure housing (5).

4.

Remove elbows (2) and (9) from housing assembly (8).

Inspect spring brake chamber diaphragm (4). Replace if cracked, torn, or split.

1.

Install elbows (2) and (9) on housing assembly (8).

2.

Install housing assembly (8) on nonpressure housing (5) with clamp (3), screw (6), and nut (7).

Tighten nut (7) 18-25 lb-ft (24-34 N•m).

3.

Install tube (10) on elbow (9).

4.

Install tube (1) on elbow (2).

3-528