4Wd Solenoid; Wing Switch - Toro Groundsmaster 455-D Service Manual

4WD Solenoid

1. Disconnect the wire connector.
2. Connect a 12 volt battery so the positive (+) battery
terminal is connected to colored solenoid lead. Connect
the negative (–) battery terminal to black lead. The valve
spool should retract completely as 12 V.D.C is applied
between leads.
3. If valve spool does not operate properly check for
binding or damage to valve.
4. If valve moves smoothly, but does not engage when
12 V.D.C is applied to solenoid leads, replace
solenoid coil.
5. If valve still does not operate after replacing solenoid
coil, replace the valve.

Wing Switch

The wing switch is closed with the wing cutting unit
lowered and open when wing cutting unit is raised.
IMPORTANT: The wing switches have three (3) ter ­
minals. Make sure the wires are connected to the
"COMMON" and "N.O." terminals.
Test the switch by disconnecting the wiring connector
for the switch and connecting a continuity tester across
the terminals. With the engine running and the P.T.O.
DISENGAGED (OFF), raise and lower the affected wing
cutting unit while watching the continuity tester. With the
wing raised, there should be no continuity. When the
wing is lowered there should be continuity.
®
Groundsmaster 455-D
(Shown from below wing with wing in raised position)
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1
2
Figure 28
1. 4WD solenoid
2. Indicator
1
Figure 29
1. Wing switch
Testing