Solenoid Operated Cartridge Valves; Relief Cartridge Valves - Toro Reelmaster 5500-D Service Manual

Solenoid Operated Cartridge Valves

1. Make sure the manifold is clean before removing the
valve.
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 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 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.
Use eye protection such as goggles when using
compressed air.
6. Cleaning cartridge valves:
A. SV2:
Submerge valve in clean mineral spirits to flush out
contamination. Use a probe to push the internal
spool in and out 20 to 30 times to flush out contami-
nation. Particles as fine as talcum powder can affect
the operation of high pressure hydraulic valves.
Clean and dry with compressed air.
B. MVS1, MVS2, SV1, SV3, SV4, SV5:
Temporarily install solenoid on cartridge valve and
connect a 12 volt power source to the solenoid. While
energized, flush out any contamination with a non-
flammable aerosol brake cleaner. De-energize the
solenoid. Repeat the flush while energized proce-
dure 5 or 6 times. Particles as fine as talcum powder
can affect the operation of high pressure hydraulic
valves. Remove solenoid.
Hydraulic System (Rev. C)
CAUTION
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 car-
tridge valve for proper operation and sealing.
B. Thread spool valve carefully into port. The valve
should go in easily without binding.
IMPORTANT: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
C. Torque cartridge valve using a deep socket to 45
ft-lb (61 N-m).
D. Make sure a new O-ring is at each end of the sole-
noid coil. Install solenoid coil to the cartridge valve.
Apply "Loctite 242" or equivalent to the threads of the
valve. Torque nut from 2 to 5 ft-lb (2.7 to 6.8 N-m).
E. If problems still exist, remove valve and clean
again or replace valve.

Relief Cartridge Valves

1. Make sure manifold is clean before removing the
cartridge valve and seal kit.
2. Remove relief valve cartridge.
3. Visually inspect port in the manifold for damage to
the sealing surfaces, damaged threads, and contamina-
tion.
4. Visually inspect relief valve cartridge 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 malfunction.
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 relief valve cartridge 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.
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CAUTION
Reelmaster 5500-D