Toro 04384 Service Manual page 123

NOTE: The ports on the hydraulic manifold are marked
for easy identification of components. Example: FC1 is
the flow control valve and P1 is the gear pump connec-
tion port (See Hydraulic Schematic to identify the func-
tion of the hydraulic lines and cartridge valves at each
port location).
NOTE: The hydraulic manifold shown in Figure 62 uses
several zero leak plugs. These plugs have a tapered
sealing surface on the plug head that is designed to re-
sist vibration induced plug loosening. The zero leak
plugs also have an O--ring to provide a secondary seal.
If zero leak plug removal is necessary, lightly rap the
plug head using a punch and hammer before using an
allen wrench to remove the plug: the impact will allow
plug removal with less chance of damage to the socket
head of the plug. When installing plugs into the manifold,
torque plugs to the values identified in Figure 62.
Solenoid Operated, Relief and Logic Control Car-
tridge Valves
1. Make sure the manifold is clean before removing the
cartridge valve and seal kit.
2. If solenoid valve is to be removed from manifold, re-
move nut securing solenoid to the cartridge valve. Care-
fully slide solenoid off the valve.
IMPORTANT: Use care when removing the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction. Make sure that
deep well socket fully engages the valve base.
3. Remove cartridge valve from manifold with a deep
well socket. Note location of O--rings and backup rings
on valve. Remove and discard removed seal kit.
4. Visually inspect the manifold port and cartridge valve
for damage to sealing surfaces, damaged threads and
contamination.
A. Contamination may cause valves to stick or hang
up. Contamination can become lodged in small valve
orifices or seal areas causing valve malfunction.
B. If valve sealing surfaces appear pitted or dam-
aged, the hydraulic system may be overheating or
there may be water in the system.
CAUTION
Use eye protection such as goggles when using
compressed air.
Greensmaster 3250--D
5. Cleaning cartridge valves:
A. For non--solenoid operated valves:
Submerge valve in clean mineral spirits to flush out
contamination. If valve design allows, use a probe to
push the internal spool in and out 20 to 30 times to
flush out contamination. Particles as fine as talcum
powder can affect the operation of high pressure hy-
draulic valves. Clean and dry cartridge with com-
pressed air.
B. For solenoid operated valves:
Temporarily install solenoid on cartridge valve and
connect a 12 volt DC power source to the solenoid.
While energized, flush out any contamination with a
non-flammable aerosol brake cleaner. De-energize
the solenoid. Repeat the flush while energized pro-
cedure 5 or 6 times. Particles as fine as talcum pow-
der can affect the operation of high pressure
hydraulic valves. Remove solenoid from cartridge.
6. Reinstall the cartridge valve into the manifold:
A. Lubricate new O-rings and backup rings of seal
kit with clean hydraulic oil and install on cartridge.
The O-rings and backup rings must be arranged
properly on the cartridge valve for proper operation
and sealing.
IMPORTANT: Use care when installing the car-
tridge valve. Slight bending or distortion of the
stem tube can cause binding and malfunction.
Make sure that deep well socket fully engages
the valve base.
B. Lubricate cartridge threads with clean hydraulic
oil. Thread cartridge valve carefully into correct man-
ifold port. The valve should go in easily without bind-
ing.
C. Torque cartridge valve using a deep well socket
to specification shown in Figure 62.
7. For solenoid valve, slide solenoid coil onto the car-
tridge valve. Install and torque nut to 60 in- -lb (6.7 N- -m).
8. If problems still exist, remove valve and clean again
or replace valve.
Page 4 - - 91 Hydraulic System