Hydraulic Solenoid Valve Coils - Toro Greensmaster TriFlex 3300 Service Manual

Hydraulic Solenoid Valve Coils

The Greensmaster hydraulic control manifolds use sev-
eral hydraulic solenoid valve coils for system control.
The lift manifold includes four (4) solenoid valves and
the mow manifold includes a single solenoid valve. On
machines equipped with the Turf Guardian
tector, the leak detector manifold includes a single sole-
noid valve. When the solenoid 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 and testing solenoid
valve coils, test the TEC controller outputs with the Diag-
nostic Display (see Diagnostic Display in the Trouble-
shooting section of this chapter). If the Diagnostic
Display verifies that the TEC outputs are functioning
correctly, consider that a problem with the solenoid
valve coil or circuit wiring may exist. An open or shorted
controller output (e.g. a failed solenoid valve coil, an un-
plugged connector or a broken wire) cannot be detected
with the Diagnostic Display. Conversely, if the Diagnos-
tic Display verifies that the TEC outputs are not func-
tioning correctly, consider that a problem with controller
inputs, controller fuses or the TEC controller may exist.
1. Park machine on level surface, lower cutting units,
stop engine, apply parking brake and remove key from
ignition switch.
2. Determine solenoid coil(s) that are to be tested and
locate coil on correct hydraulic manifold:
A. Remove right side cover next to operator seat to
allow access to lift control manifold.
B. Remove left side cover next to operator seat to al-
low access to mow control manifold.
C. To gain access to leak detector manifold, see
Leak Detector Solenoid Valve Assembly in the Ser-
vice and Repairs section of Chapter 5 -- Hydraulic
System.
3. Disconnect harness electrical connector from hy-
draulic solenoid valve coil that is to be tested (Figs. 49,
50 or 51).
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.
Electrical System
TM
Leak De-
3
1
1. Hydraulic lift manifold
2. Solenoid valve S1
3. Solenoid valve S2
2
1. Hydraulic mow manifold
Page 6 - - 40
5
Figure 49
4. Solenoid valve S3
5. Solenoid valve S4
1
Figure 50
2. Solenoid valve (PRV)
Greensmaster 3300/3400
4
2