Toro Greensmaster 3150 Service Manual page 95

Solenoid Operated Cartridge Valves (Fig. 39)
1. Make sure the manifold is clean before removing
the valve(s).
2. Remove nut securing solenoid to the cartridge
valve. Slide solenoid and both O–rings off the valve.
Note: 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.
Remove seal kit.
4. Visually inspect the port in the manifold for damage
to the sealing surfaces, damaged threads, and contami-
nation.
5. Visually inspect cartridge valve for damaged seal-
ing surfaces and contamination.
A. Contamination may cause valves to stick or
hang up. Contamination can become lodged in
small valve orifices or seal areas causing malfunc-
tion.
B. If spool valve (8) sealing surfaces appear pitted
or damaged, the hydraulic system may be overheat-
ing 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 clean mineral spirits to flush out con-
tamination. Use a probe to 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 hydraulic valves. Use compressed air for
cleaning.
7. Reinstall the cartridge valve:
A. Lubricate new O–rings and backup rings of seal
kit with clean hydraulic oil and install. The O–ring
and backup ring must be arranged properly on the
cartridge valve for proper operation and sealing.
B. Thread spool valve carefully into port. The valve
should go in easily without binding.
Note: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
Greensmaster 3150
C. Torque cartridge valve using a deep socket to 35
ft–lb (47 Nm).
D. Make sure a new O–ring is at each end of the so-
lenoid coil. Install solenoid coil to the cartridge
valve. Apply "Loctite 242" or equivalent to the
threads of the valve. Torque nut to 15 in–lb (1.7
Nm).
E. If problems still exist, remove valve and clean
again or replace valve.
Cartridge Relief Valves (Fig. 39)
1. Make sure the manifold is clean before removing
the cartridge valve and seal kit.
2. Remove cartridge relief valve.
3. Visually inspect port in the manifold for damage to
the sealing surfaces, damaged threads, and contamina-
tion.
4. Visually inspect cartridge relief valve for damaged
sealing surfaces and contamination.
A. Contamination may cause valves to stick or
hang up. Contamination can become lodged in
small valve orifices or seal areas causing malfunc-
tion.
B. If sealing surfaces appear pitted or damaged,
the hydraulic system may be overheating or there
may be water in the system.
Use eye protection such as goggles when using
compressed air.
5. Clean cartridge relief valve using clean mineral spir-
its. Submerge valve in clean mineral spirits to flush out
contamination. Particles as fine as talcum powder can
affect the operation of high pressure hydraulic valves.
Use compressed air for cleaning.
6. Reinstall the cartridge relief valve:
A. Lubricate new O–ring and backup ring of seal kit
with clean hydraulic oil and install. The O–ring and
backup ring must be arranged properly on the car-
tridge valve for proper operation and sealing.
B. Thread cartridge relief valve carefully into the
applicable port. The valve should go in easily with-
out binding. Torque valve to 35 ft–lb (47 Nm).
Page 4 – 71 Rev. C
CAUTION
Hydraulic System