Greensmaster 3250--D Hydraulic SystemPage 4 -- 9 1
NOTE: The ports onthehydraulicmanifold aremarked
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: ThehydraulicmanifoldshowninFigure62uses
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 t o remove t he 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 62.
Solenoid Operated, Relief and Logic Control Car-
tridge Valves
1. Make surethemanifoldiscleanbefore removingthe
cartridge valve and seal kit.
2. If solenoid valve is to be removed from manifold, r e-
movenutsecuringsolenoidtothecartridgevalve.Care-
fully slide solenoid off the valve.
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.
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. Visuallyinspectthemanifoldportandcartridgevalve
for damage to sealing surfaces, damaged threads and
contamination.
A. Contamination maycausevalvestostickor hang
up.Contaminationcanbecomelodgedinsmallvalve
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 t he system.
CAUTION
Use eye protection such as goggles when using
compressed air.
5. Cleaning cartridge valves:
A. For non--solenoid operated valves:
Submerge valve in clean mineral spirits to flush out
contamination.If valve designallows,use a probeto
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-
cedure5or6times.Particlesasfineastalcumpow-
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.Threadcartridgevalvecarefullyintocorrectman-
ifold port. The valve should go in easily withoutbind-
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-
tridgevalve.Installandtorquenutto60in--lb(6.7N--m).
8. If problems still exist, remove valve and clean again
or replace valve.
Hydraulic
System
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