Hydraulic Solenoid Valve Coils (Optional) - Toro Sand Pro 3040 Service Manual

Hydraulic Solenoid Valve Coils (Optional)

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1. Rear remote hydraulics kit manifold 4.
2. Valve coil (rear attachment)
3. Coil nut
Testing the Hydraulic Solenoid Valve Coils
Sand Pro ® 3040 and 5040
20251SL Rev A
hydraulics switch kit manifold
5. Valve SV1 coil (tank)
6. Valve SV2 coil (front attachment)
Electric coil actuated hydraulic valves are used on the optional rear remote
hydraulics kit manifold and the optional hydraulics switch kit manifold. When the
coil is energized, the hydraulic valve shifts to control hydraulic flow.
To assist in troubleshooting, identical replaceable solenoid coils can be
exchanged. If the problem follows the coil, the coil is likely at fault. If the problem
remains unchanged, something other than the coil is the likely problem source
(e.g. switch, circuit wiring, hydraulic problem).
Typically, a failed solenoid coil will either be shorted (very low or no resistance)
or open (infinite resistance).
1. Locate the hydraulic solenoid valve coil to be tested and disconnect the wire
harness connector from the coil. Check the harness connectors for damage
or corrosion and clean or repair if necessary.
Note: Prior to taking small resistance readings with a digital multimeter, short
the meter test leads together. The meter will display a small resistance value
(usually 0.5 ohms or less). This resistance is due to the internal resistance of
the meter and test leads. Subtract this value from the measured value of the
component you are testing to obtain an accurate reading.
2. Using a multimeter (ohms setting), measure the resistance between the two
(2) connector terminals on the solenoid coil. The resistance for the solenoid
coils is identified below:
A. The coil of the rear attachment solenoid valve on the optional rear remote
hydraulics manifold should measure approximately 7.1 ohms when
tested at 20° C (68° F).
B. The coils of solenoid valves SV1, SV2, and SV3 on the optional
hydraulics switch kit manifold are the same. Resistance of these coils
should be approximately 8.8 ohms when tested at 20° C (68° F).
3. Replace solenoid valve coils if necessary:
A. Remove the nut from the hydraulic valve.
B. Slide the solenoid coil from the valve.
C. Clean any corrosion or dirt from the valve stem.
Figure 87
Page 6–23 Electrical System: Testing the Electrical Components
7. Valve SV3 coil (rear attachment)