Paccar CARCO 50B, Service Manual

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55
7. Remove the two (2) check valve assemblies from the
valve housing through the front, or forward, face of the
valve. Build the special spanner socket, defined
below, for use in removing the check valves.
8. Thoroughly clean and inspect all parts of the control
valve. Replace the check valve assembly if there is
any damage to the sealing surfaces of the stem and
the housing.
ASSEMBLY AND INSTALLATION
1. Install new O-rings and back-up rings on the solenoid
valves before installation. Seal kits are available for all
of the valve cartridges. Lubricate the seals with new
winch oil prior to assembling.
2. Unless you are installing new components, carefully
install the solenoid valve cartridges back into the valve
housing bores they were originally removed from.
Tighten the valve cartridges to the torque values listed
in the chart below / on page 56.
CONTROL VALVE SERVICE
Make certain that all applicable troubleshooting proce-
dures have been completed BEFORE removing or disas-
sembling the control valve. Refer to the "Control System
Operation and Troubleshooting" section of this manual for
more information. All repairs to the control valve must be
performed in a clean work environment.
CONTROL VALVE REMOVAL AND DISASSEMBLY
1. Stop the tractor engine. With the key switch in ON
position, discharge the accumulator stored oil supply
by slowly cycling the joystick control lever into full
REEL-IN then REEL-OUT positions as a minimum of
(5) times.
2. Remove the filter and valve access cover from the RH
side of the winch case.
3. Remove the filter element from the filter head.
Carefully tag all hoses to aid assembly then remove all
of the hoses from the control valve. Disconnect the
wiring harness from the solenoids at all connections.
The wires are color keyed. Refer to the "Control
System Operation and Troubleshooting" section of
this manual for wire color/function and connection
point information.
4. Remove the pump supply hose from the filter head.
Remove the two (2) capscrews that secure the valve
to the mounting bracket and remove the valve assem-
bly from the winch case.
5. Place the valve on a clean work surface and remove
the filter head assembly from the valve.
6. The solenoid valves may be removed from the valve
housing by first removing the solenoid coil from the
valve cartridge.
a.Carefully remove the lock tab down and away
from the retaining nut.
b. Remove the retainer nut from the top of the sole-
noid and lift the coil off of the cartridge.
c. Remove the solenoid valve cartridge from the
valve housing.
Discharge accumulator oil supply before removing any
hydraulic lines or servicing winch. Personal injury may
result from sudden release of oil pressure. To discharge
the accumulator, stop the engine, turn the key switch
on, then slowly cycle the joystick lever into full REEL-IN
and REEL-OUT positions a minimum of five (5) times.
NOTE: The tractor electrical system must be ON.