4WD Solenoid
1. Disconnect the wire connector.
2. Connect a 12 volt battery so the positive (+) battery
t
erminal 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
bind
ing or damage to valve.
4. If valve moves smoothly, but does not engage when
1
2 V.D.C is applied to solenoid leads, replace
solenoid coil.
2
1
Figure 28
5. If valve still does not operate after replacing solenoid
c
oil, replace the valve.
1. 4WD solenoid
2. Indicator
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.
Figure 29
1
1. Wing switch
(Shown from below wing with wing in raised position)
Electrical System
Groundsmaster
®
455-D Page 5 - 27 Testing
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