Greensmaster 3300/3400 Hydraulic SystemPage 5 -- 91
Control Manifold Cartridge Valve Service
CAUTION
Before continuing further, read and become fa-
miliar with General Precautions for Removing
and Installing Hydraulic System Components in
this section.
1. Make sure the control manifold is clean before re-
moving the cartridge valve from the control manifold.
2. If cartridge valve is solenoid operated, remove nut
securing solenoid coil to the cartridge valve. Carefully
slidecoiloffthevalve.
IMPORTANT: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction. When remov-
ing cartridge valve from manifold, make sure that
deep well socket fully engages the valve base.
3. Remove cartridge valve from manifold using a deep
socket wrench. Note correct location for O--rings, seal-
ing rings and backup rings. Remove seal kit from car-
tridge valve and discard removed seals.
4. Visually inspect the port in the manifold for damage
tothesealing surfaces,damaged threads andcontami-
nation.
5. Visuallyinspectcartridgevalve fordamagedsealing
surfaces and contamination.
A. Contaminationmaycausevalvestostickorhang
up.Contaminationcanbecomelodgedinsmallvalve
orifices or seal areas causing 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.
6. Clean cartridge valve using clean mineral spirits.
Submergevalveincleanmineralspiritstoflushoutcon-
tamination.Particlesasfineastalcumpowdercanaffect
the operation of high pressure hydraulic valves. If car-
tridgedesignallows,useawoodorplasticprobetopush
the internal spool in and out 20 to 30 times to flush out
contamination.Beextremelycarefulnotto damagecar-
tridge. Use compressed air for cleaning.
7. Install the cartridge valve into the manifold:
A. Lubricatenewsealkitcomponentswithcleanhy-
draulic oil and install on valve. The O--rings, sealing
ringsandbackupringsmustbearrangedproperlyon
the cartridge valvefor proper operation andsealing.
B. Dip assembled cartridge into clean hydraulic oil.
IMPORTANT: Use care when handling the valve
cartridge. Slight bending or distortion of the
stem tube can cause binding and malfunction.
When installing cartridge valve into manifold,
make sure that deep well socket fully engages
the valve base.
C. Thread cartridge valve carefully into manifold
port by hand until the top O--ring is met. The valve
should go into manifold port easily without binding.
D. Torque cartridge valve using a deep socket
wrenchtov alueidentifiedincontrolmanifoldillustra-
tion.
8. If cartridge valve is solenoid operated, carefully
install solenoidcoil to thecartridge valve.Secure coil to
valve with nut and torque nut to 60 in--lb (6.8 N--m).
9. If problems still exist after manifold assembly, re-
move cartridge valve and clean again or replace valve.
Hydraulic
System
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