INSPECTION (cont) - TM-9-2320-285-24-20172

TM 9-2320-285-24-2

3-23. TREADLE VALVE MAINTENANCE (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

INSPECTION (cont)

b. Valve body (16)

Inspect

Replace entire brake treadle

(cont)

valve assembly if valve

body (16) is cracked,

broken, excessively worn,

or bores or threads damaged

Piston (19) and Inspect

Replace if cracked, broken,

valve (31)

or scored

d. Piston return

Inspect

Replace if cracked, broken,

spring (20),

or permanently set

preload

spring (30),

and spring

(32)

e. Diaphragm (29)

Inspect

Replace if cracked, broken,

inflexible, or deteriorated

All other parts

Inspect

Replace if cracked, broken,

distorted, or threads

damaged

REASSEMBLY

NOTE

Lightly coat piston (19), new O-rings (21, 26, and 33), and bores in valve body (16) with pneumatic grease

before reassembly.

Valve

Piston (19), new

Lubricate

Use pneumatic grease

body

O-rings (21, 26,

(16)

and 33), and

bores in valve

body (16)

Valve

a. Preload spring

Position

In seat (35)

insert

(30)

assembly

b. Diaphragm (29)

Install

(items 26

thru 35)

NOTE

In following step, washer (28) must be installed with lips pointing out.

c. Washer (28)

Install

d. Screw (27)

Install

Tighten securely

3-166