Greensmaster 3150Page 5 -- 20Electrical System
Solenoid Valve Coils
TheGreensmasterhydrauliccontrol manifolduses sev-
eral hydraulic solenoid valve coils for system control.
When the solenoid coils are energized, hydraulic valve
shiftoccurstocontrolhydrauliccircuitflow.Testingofthe
coils can be done withthe coil installed on the hydraulic
valve.
Testing
1. Determinesolenoidcoil(s)thatistobetestedandlo-
catecoilonhydraulicmanifold(Fig.23).Disconnecthar-
ness electrical connector from solenoid valve coil.
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
Themetermaydisplayasmallresistancevalue(usually
0.5 ohms or less). This resistance is due to the internal
resistanceof themeter andtest leads.Subtractthis val-
ue from the measured value of the solenoid coil being
testing.
NOTE: Solenoid coil resistance should be measured
withsolenoidatapproximately 68
o
F(20
o
C).Resistance
maybe slightlydifferentthan listedat different tempera-
tures. Typically, a failed solenoid coil will either be
shorted (very low or no resistance) or open (infinite re-
sistance).
2. Using a multimeter (ohms setting), measure resis-
tance between the two (2) connector t erminals on the
solenoidvalve coil.The resistance forthe solenoidcoils
is identified below:
Solenoid Valve Coil
Resistance
S1R1 and S3 7.1 ohms
S2 and S4 8.6 ohms
3. If solenoid coil resistance is incorrect, replace sole-
noidcoil (referto controlmanifold serviceprocedures in
the Serviceand Repairs section ofChapter 4 -- Hydrau-
lic System).
NOTE: To assist in troubleshooting, identical solenoid
valvecoils canbeexchanged.If theproblemfollows the
exchanged coil, an electrical problem likely exists with
the coil. If the problem remains unchanged, something
other than the solenoid coil is t he problem source (e.g.
switch, circuit wiring, hydraulic problem). The control
manifold S1R1 coil is the same as the manifold S3 coil.
The manifold S2 and S4 coils are identical.
4. After coil testing is completed, connect wire harness
electrical connector to the solenoid valve coil.
5. Secure all machine components that were removed
to access hydraulic manifold.
1. Solenoid S1R1 (7.1 ohm)
2. Solenoid S2 (8.6 ohm)
3. Solenoid S3 (7.1 ohm)
4. Solenoid S4 (8.6 ohm)
Figure 23
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2
3
4
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