Quantcast Brake Applicator Valve and Differential Pressure Switch.

 

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Automatic Brake Adjusters
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TM-10-3930-634-34 Truck Lift Fork; Diesel Engine Pneumatic Tired Wheels Rough Terrain 6 000 Lb. Capacity 24 Load Center Anthony Model MIT 6-2 Manual
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Test Procedure. - TM-10-3930-634-340189
TM 10-3930-634-34
NOTE
e. Installation. Install the automatic brake adjuster
Replace a defective differential pressure
and bleed the hydraulic  brake system (TM
switch with a new switch.
10-3930-634-12).
b. Disassembly of Brake Valve. Refer to figure 5-10
and disassemble the brake valve assembly in nu-
merical sequence as follows:
NOTE
Measure the depth that the adjusting plug
(32) is below the surface of valve body (3).
Scribe a mark in line with plug slot. Record
this information, as it must be used in re-
assembly of valve.
(1) The piston (6) pulls out of the valve body(3).
(2) Shims (7 and 8) will be found inside piston.
The shims are used for adjusting the brake line pres-
sure and must be used in the reassembly of valve.
Never mix parts from another valve.
(3) Remove packing (10) from valve body,
(4) Remove retaining ring (11) and washer (12).
(5) Remove plunger (13) from valve.
(6) Remove plug (15) from valve and remove
spring (20) and guide (21).
(7) Use a wooden dowel or other soft material to
push out ball valve and seat (22).
(8) Remove plug (24) and remove pilot valve
spring (26), ball (27), spool (28) and seat (29).
(9) Remove pilot valve plug (32) and remove
spring (34), seat (35) and ball (36).
(10) Remove plug (38) and remove spring (40),
stop (41), and charging valve spool (43).
(11) Loosen locknut (45). Remove screw (46) and
remove spring (48), poppet (49), seat (50) and filter
(52).
c. Cleaning and Inspection.
(1) Clean all parts thoroughly, using solvent
P-D-680, or equal.
(2) Inspect the piston (6, fig. 5-10) for nicks and
scratches.
(3) Inspect surface of the valve seat in the plunger
(13) for proper seating and outside signs of wear.
(4) Inspect the seat in the bronze plunger.
(5) Inspect valve seat in end of pilot valve seat
(29).
(6) Assemble pilot valve spool (28) inside pilot
valve seat (29) and place the steel balls (27) in their re-
spective seats and measure with a micrometer. Record
this measurement.
(7) Remove spool and place the steel balls in their
5 - 1 2 . Brake Applicator Valve and Differ-
respective seats and measure. Subtract the smaller di-
e n t i a l Pressure Switch.
mension. If difference is less than 0.004 inch, replace
the spool.
a. Removal.
(8) Inspect the nylon pins in the charging valve
(1) Remove the driver's floor plate and access
plug for wear or damage. These pins are used to keep
panel under the left fender (TM 10-3930-634-12).
the plugs from working loose.
(2) Refer to figure 5-9 and remove the differen-
tial pressure switch and brake applicator valve.
d. Reassembly.

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