10-4 BRAKE CONTROL VALVE - REPAIR (Contd)
See Cleaning Instructions, para 2-10
MEASURE SPOOL (32) AND BALLS (26 AND
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 and 31) on their respective
seats. Measure with a micrometer.
c. Subtract smaller dimension from
larger dimension If difference
is less than 0 004 inch, replace
spool (32) with a new one.
INSPECT PLUG AND LOCKING PIN
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
b. Check to see if nylon pin has
sufficient friction with threads
to keep plug (22) from vibrating
c. If there is no increase in torque
required to turn plug (22) when pin
engages threads, replace pin.
Wipe all sealing surfaces on pump clean
and dry Apply film of clean hydraulic
oil to all seals as they are installed.