10
INSTALLATION MANUAL FOR 490A
3. Using needle-nose pliers or a magnet, remove
the control valve (see Fig. 15).
4. Wash the control valve with approved cleaning
solvent. Push a wire through the hole in the
base of the valve to ensure that the ball check
is free. The ball should lift with light pressure
on the wire. If the ball is stuck or there is no
spring pressure, replace the control valve. Dry
the valve with compressed air and wipe clean
with a paper towel.
5. Thoroughly clean the control valve bore in the
housing using clean paper towels.
6. Dip the control valve in clean lube oil. Drop the
valve into its bore. If binding occurs, the control
valve should be replaced.
7. Reassemble the parts, reversing the removal
procedure. Be sure retaining ring ears are posi-
tioned opposite the oil drain slot in the housing
(see Fig. 16).
NOTE:
BE SURE THE CONTROL VALVE COLLAR
IS INSTALLED WITH THE LONGER SLEEVE
AREA UP (SEE BELOW). IF THE COLLAR IS
INSTALLED UPSIDE DOWN, THIS BRAKE
CYLINDER WILL NOT OPERATE.
FIG. 15
FIG. 16
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