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Groundsmaster 5900/5910 Hydraulic SystemPage 4 -- 89
Valve Cartridge Service
1. Make sure the entire outer surface of the manifold is
clean before removing the valve.
2. If cartridge is solenoid operated, remove nut secur-
ing solenoid coil to the cartridge valve. Carefully slide
solenoid coil off the valve.
IMPORTANT: Use care when handling the valve car -
tridge. 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 sealing surfaces, damaged threads and contami-
nation. Also, inspect cartridge valve for damaged seal-
ing surfaces and contamination.
A. Contamination may cause valves to s tick or hang
up.Contaminationcanbecomelodgedin small 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.
5. Clean cartridge valve using clean mineral spirits.
Submerge valve in clean mineral spirits to flush out con-
tamination.Particles as fine as talcumpowder canaffect
the operation of high pressure hydraulic valves. If car-
tridge design allows, use a wood or plasticprobe topush
the internal spool in and out 20 to 30 times to flush out
contamination. Be extremely careful to not damage car-
tridge. Use compressed air for cleaning.
6. Reinstall the cartridge valve:
A. Lubricate new seal kit components with clean hy-
draulic oil and install on valve. The O--r ings, sealing
rings and backup rings must be arranged properly on
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 cartridge valve using a deep socket to val-
ue identified in manifold illustration.
D. If cartridge is solenoid operated, carefully install
solenoid coil to the cartridge valve. Torque nut to val-
ue identified in manifold illustration. Over--tightening
may damage the solenoid or cause the valve to mal-
function.
7. If problems still exist, remove valve and clean again
or replace valve.
Hydraulic
System