Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 99
4WD Manifold Service (Fig. 75)
1. Makesurethemanifoldiscleanbeforeremovingany
of the cartridge valves.
2. If cartridge valve is solenoid operated, remove nut
securing solenoid to the cartridge valve. Carefully slide
solenoid off the valve.
IMPORTANT: Use care when removing cartridge
valves.Slightbendingordistortionof the stemtube
can cause binding and malfunction. Make sure that
deep well socket fully engages the valve base.
3. Remove cartridge valve with a deep well socket.
Note correct location for O--rings, sealing rings and
backup rings. Remove and discard seal kit.
4. Visually inspect the port in the manifold for damage
tothesealingsurfaces,damagedthreadsorcontamina-
tion.
5. Visually inspectcartridge valvefor damagedsealing
surfaces and contamination.
A. Contaminationmaycausevalvestostickorhang
up.Contaminationcanbecomelodgedinsmallvalve
orifices or seal areas causing malfunction.
B. If valve s ealing 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.Beextremelycarefulnottodamagecar-
tridge. Use compressed air for cleaning.
7. The 4WD manifold includes three (3) orifice fittings
(items9 and12).The 0.030orifice(item 9) ispositioned
in the SV port under the solenoid cartridge valve. The
0.050 orifices (item 12) thread into the manifold in ports
OR1 and OR2. Before removing or installing the orifice
inOR1,removal ofthe #6plug inthebottomoftheman-
ifold is necessary.
8. Reinstall the cartridge valve:
A. Lubricatenewsealkitcomponentswithcleanhy-
draulic oil and install on valve. The O--r ings, sealing
ringsandbackupr ingsmustbearrangedproperlyon
the cartridge valve for proper operation and sealing.
IMPORTANT: Use care when installing cartridge
valves. 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. Lubricatethreads of cartridgewith clean hydrau-
lic oil. Thread cartridge valve carefully into manifold
port. The valve should go in easily without binding.
C. Torque cartridge valve using a deep well socket
to value identified in manifold illustration.
D. If cartridge is solenoid operated, carefully install
solenoidcoiltothecartridgevalve.Torquenuttoval-
ue identified in manifold illustration.
9. If problems still exist, remove valve and clean again
or replace valve.
Hydraulic
System
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