Hydraulic Valve Solenoid Coils
There are numerous hydraulic valve solenoid coils on
theGroundsmasterhydraulicmanifolds.Whenthesole-
noid coils are energized, hydraulic valve shift occurs to
control hydraulic flow. Testing of these solenoid coils
canbedonewiththesolenoidcoilonthehydraulicvalve.
1
2
Testing
NOTE: A faulty solenoid coil or solenoid circuit wiring
problem will not be identified by the Info Center Display.
TheInfoCenter Display can beused toverify thatoutput
currentfromtheTECisavailableforthesolenoidcoilbut
theDisplaywillnotverifythatthesolenoidcoilandcircuit
wiring is functioning correctly.
Figure 98
2.
1.
LH PTO manifold
Solenoid coil (port S)
1.
2.
Identify the solenoid coil that is to be tested.
Disconnect wire harness electrical connector from
2
hydraulic solenoid valve coil that is to be tested.
1
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
Themeter maydisplay asmallresistance value (usually
0.5
ohms or less). This resistance is due to the internal
resistance of the meter and test leads. Subtract this val-
ue from from the measured value of the component you
are testing.
Figure 99
2.
1.
RH PTO manifold
Solenoid coil (port S)
3.
Using a multimeter (ohms setting), measure resis-
tance between the two (2) connector terminals on the
solenoid coil. The resistance for the solenoid coils is
identified below:
2
A. The solenoid coils at the following control man-
ifold ports are the same. Resistance of these coils
should be approximately 8.8 ohms.
1
PTO manifold port S (Figs. 98, 99 and 100)
Traction manifold port S (Fig. 101)
4WD manifold port SV (Fig. 102)
Lift manifold ports S1, S4, S5 and S9 (Fig. 103)
Figure 100
1.
Center PTO manifold
2.
Solenoid coil (port S)
B. The solenoid coils at the following control man-
ifold ports are the same. Resistance of these coils
should be approximately 7.1 ohms.
1
Lift manifold ports S2, S3, S6, S7 and S8 (Fig.
103)
Steering/cooling fanmanifoldportPRV(Fig.104)
C. Resistance of the solenoid coil at steering/cool-
ing fan manifold port S should be approximately 4.6
ohms (Fig. 104).
2
4.
(see Hydraulic Valve Solenoid Coil Removal and Instal-
lationintheServiceandRepairssectionofthischapter).
If solenoid coil resistance is incorrect, replace coil
Figure 101
1.
Traction control manifold
2.
Solenoid coil (port S)
Electrical System
Page 5 -- 56
Groundsmaster 5900/5910
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