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Groundsmaster 3505--D Hydraulic SystemPage 4 -- 71
Cartridge Valve Service (Fig. 44)
1. Make sure the manifold is clean before removing the
valve.
2. If cartridge is solenoid operated, remove nut secur-
ing solenoid to the cartridge valve. Carefully slide sole-
noid coil off the valve.
IMPORTANT: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
3. Remove cartridge valve with a deep socket wrench.
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
to the sealingsurfaces, damaged threads or contamina-
tion.
5. Visually inspect cartridge valve for damaged sealing
surfaces and contamination.
A. Contamination may cause valves to stick or hang
up. Contaminationcan becomelodged insmall valve
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.
Submerge valve in c lean mineral spirits to flush out con-
tamination. Particlesas fine astalcum powder canaffect
the operation of high pressure hydraulic valves. Be ex-
tremely careful not to damage cartridge. Use com-
pressed air for cleaning.
7. Reinstall the cartridge valve into the manifold block:
A. Lubricate new seal kit components w ith clean hy-
draulic oil and install on valve. The o--rings, sealing
rings andbackup rings mustbe arranged properlyon
the cartridge valve for proper operation and sealing.
IMPORTANT: Use care when handling the valve
cartridge. Slight bending or distortion of the
stem tube can cause binding and malfunction.
B. Thread cartridge valve carefully into manifold
port. The valve should go in easily without binding.
C. Torque cartridgevalve using a deepsocket tov al-
ue identified in manifold illustration (Fig. 44).
D. If cartridge is solenoid operated, carefully install
solenoid coil to the cartridge valve. Torque nut to val-
ue identified in manifold illustration (Fig. 44).
8. If problems still exist, remove valve and clean again
or replace valve.
1. Manifold assembly
2. Logic valve (LC1)
3. Solenoid valve (R1)
4. Braking valve (BV)
Figure 45
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3
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Hydraulic
System