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 Schematics to identify the func-
tion of the hydraulic lines and cartridge valves at each
port location).
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.
NOTE: ThehydraulicmanifoldshowninFigure59uses
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
headoftheplug.Wheninstallingplugsintothemanifold,
torque plugs to the values identified in Figure 59.
B. For solenoid operated valves:
Temporarily install solenoid on cartridge valve and
connecta12voltpowersourcetothesolenoid.While
energized, flush out any contamination with a non-
flammable aerosol brake cleaner. De-energize the
solenoid. Repeat the flush while energized proce-
dure 5 or 6 times. Particles as fine as talcum powder
can affect the operation of high pressure hydraulic
valves. Remove solenoid from cartridge.
Solenoid Operated, Relief and Logic Control Car-
tridge Valves
6.
Reinstall the cartridge valve into the manifold:
1.
cartridge valve and seal kit.
Make sure the manifold is clean before removing the
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.
2.
move nutsecuring solenoid tothecartridge valve. Care-
fully slide solenoid off the valve.
If solenoid valve is to be removed from manifold, re-
IMPORTANT: Usecarewhenremovingthecartridge
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.
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.
3.
Make sure manifold is clean before removing the
cartridge valve. 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.
B. Lubricate cartridge threads with clean hydraulic
oil.Threadcartridgevalvecarefully intocorrectman-
ifold port. The valve should go in easily without bind-
ing.
4.
for damage to sealing surfaces, damaged threads, and
contamination.
Visuallyinspectthemanifoldportandcartridgevalve
C. Torque cartridge valve using a deep well socket
to specification shown in Figure 59.
7.
For solenoid valve, slide solenoid coil onto the car-
A. Contamination may cause valves to stick or hang
up.Contaminationcanbecomelodgedinsmallvalve
orifices or seal areas causing valve malfunction.
tridgevalve.Installandtorquenutto60in--lb(6.7N--m).
8.
If problems still exist, remove valve and clean again
or replace valve.
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
Page 4 -- 93
Hydraulic System (Rev. I)
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