REAR AIR BRAKE CHAMBER MAINTENANCE - TM-9-2320-303-24-10783

TM 9-2320-303-24-1

REAR AIR BRAKE CHAMBER MAINTENANCE

0140 00

THIS WORK PACKAGE COVERS

Inspection, Removal, Installation

INITIAL SETUP

Materials/Parts - Continued

Maintenance Level

Unit

Pin, cotter (P/N 2257D1174)

Tools and Special Tools

References

Tool kit, general mechanic's (Item 102, WP 0313

TM 9-2320-303-10

Equipment Condition

Materials/Parts

Brakes caged (TM 9-2320-303-10)

Compound, pipe, sealing (Item 17, WP 0312 00)

Parking brake released (TM 9-2320-303-10)

Tags, marker (Item 42, WP 0312 00)

Vehicle blocked (TM 9-2320-303-10)

Nut, lock (P/N 9002001) (2)

Pin, cotter (P/N 2257C1173)

Air system drained (TM 9-2320-303-10)

INSPECTION

Chock wheels.

NOTE

When inspection has been completed, ensure that weather seal cap is installed in release stud hole in spring

brake chamber.

Remove weather seal cap from spring brake chamber and visually inspect through release stud hole. When fully released

with 90-120 psi air pressure, top of piston on chamber should be no more than 1/4-3/8 in from top of head. Release stud

access hole in center of piston should be somewhat centered.

Cage the brakes (TM 9-2320-303-10). If brakes will not cage, suspect a broken spring. Go to step 4.

Apply parking brake and measure pushrod stroke. A short or no stroke, compared to other wheels, indicates a broken

spring.

With parking brake applied, tap head of spring brake chamber. A good spring will produce a ring/harmonic vibration.

NOTE

In some cases brake chamber pushrod will return to zero position with a broken spring condition. Check in

step 6 should not be considered as a definitive test.

Release parking brake and measure pushrod position. If it does not return all the way to zero stroke position, suspect a

broken spring.