BRAKE CONTROL VALVE REPAIR - continued

TM 10-3930-673-34

10-4. BRAKE CONTROL VALVE REPAIR (CONT)

(2)

Separate and disassemble control

housing (55) from charging

section (56).

(a)

Remove two screws (57) and

lockwashers (58). Discard

lockwashers.

(b)

Remove screw (59) and

lockwasher (60). Discard

lockwasher.

(c)

Separate control housing (55) from

charging section (56).

(d)

Remove preformed packings (61 and

62) from charging section (56).

Discard preformed packings.

(e)

If damaged, remove two screws (63)

and label (64) from charger

section (56).

b. Cleaning. See Cleaning Instructions

(Para 2-12).

TR00478

c. Inspection.

(1)

Measure spool (32) and balls (26

and 31).

(a)

Assemble spool (32) inside insert (33).

Place balls (26 and 31) in respective

seats. Measure across balls (26 and 31)

with a micrometer. Record

measurement.

(b)

Remove spool (32) and place balls (26

TR00479

and 31) on their respective seats (25

and 30). Measure with a micrometer.

(c)

Subtract smaller dimension from larger dimension. If difference is less than 0.004 in.

(0.10 mm), replace spool (32).

(2)

Inspect plug and locking pin assembly (22).

(a)

The plug (22) has a nylon pin through threaded end so that plug will hold adjustment to

which it is set. Screw plug into control housing (55).

(b)

Check to see if nylon pin has sufficient friction with threads to keep plug (22) from vibrating

loose.

(c)

If there is no increase in torque required to turn plug (22) when pin engages threads, replace

pin.

10-12