Hydraulic Solenoid Valve Coils - Toro Groundsmaster 360 Service Manual

Hydraulic Solenoid Valve Coils

The Groundsmaster 360 hydraulic control manifolds
use several hydraulic solenoid valve coils for system
control. The deck lift manifold includes two (2) solenoid
valves and the steering control manifold on 4WD ma-
chines includes a single solenoid valve. When the sole-
noid coils are energized, hydraulic valve shift occurs to
control hydraulic circuit flow. Testing of the coils can be
done with the coil installed on the hydraulic valve.
Testing
NOTE: Before disconnecting solenoid valve coils on
machines with 4WD, test the solenoids and their circuit
wiring as TEC controller outputs with the Diagnostic Dis-
play (see Diagnostic Display in the Troubleshooting sec-
tion of this chapter). If the Diagnostic Display verifies
that solenoid coils and circuit wiring are functioning cor-
rectly, no further testing is necessary.
1. Park machine on level surface, lower cutting deck,
stop engine, apply parking brake and remove key from
ignition switch.
2. To gain access to control manifolds and solenoid
coils, raise and support the operator seat.
3. Disconnect harness electrical connector from hy-
draulic solenoid valve coil that is to be tested (Fig. 59).
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
The meter may 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 val-
ue from the measured value of the solenoid coil being
testing.
NOTE: Solenoid coil resistance should be measured
with solenoid at approximately 68
may be slightly different than listed at different tempera-
tures. Typically, a failed solenoid coil will either be
shorted (very low or no resistance) or open (infinite re-
sistance).
4. Using a multimeter (ohms setting), measure resis-
tance between the two (2) connector terminals on the
solenoid valve coil. The resistance for the solenoid coils
is identified below:
Solenoid Valve Coil
Lift
Steering (4WD ma-
chines)
Groundsmaster 360
o o
F (20 C). Resistance
Resistance
8.8 ohms
7.1 ohms
Page 5 - - 45
5. If solenoid coil resistance is incorrect, replace sole-
noid (see Hydraulic Solenoid Valve Coil Removal and
Installation in the Service and Repairs section of this
chapter).
NOTE: The two (2) solenoid valve coils on the deck lift
manifold are identical. To assist in troubleshooting, iden-
tical coils can be exchanged. If the problem follows the
exchanged coil, an electrical problem likely exists with
the coil. If the problem remains unchanged, something
other than the solenoid coil is the problem source (e.g.
switch, circuit wiring, hydraulic problem).
6. After coil testing is completed, connect wire harness
electrical connector to the solenoid valve coil.
7. Lower and secure seat.
2
1
Y
Z X
Figure 59
1. Lift manifold
2. Steering manifold
3
3. Transmission
Electrical System