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Groundsmaster 4000--DPage 5 -- 32Electrical System
Cutting Deck Position Switch
The cutting deck position switches on the Groundsmas-
ter 4000--D are located on the traction unit frame (Fig.
51 and 52). The position switch is a normally open, pow-
ered proximity switch that incorporates an internal reed
switchandrelay (seeschematicin Figure53).The sens-
ing plate is located on the cutting deck lift arm. The
switches for front and side decks are the same although
their operation depends on deck location.
When a side cutting deck is raised, the sensing plate is
moved away from the position switch and the switch
opens.Theopen switch prevents current flowtotheside
deck solenoid and keeps the deck from operating.
When the front cutting deck is raised, the sensing plate
is moved near the position switch and the switch closes.
The closed switch prevents current flow to the frontdeck
solenoid and keeps the deck from operating.
Testing
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Locate switch that requires testing and disconnect
switch connector from machine wiring harness.
3. Ground switch connector terminal for black wire and
apply 12 VDC to switch connector terminal for red wire.
4. Using a multimeter, verify that switch connector ter-
minal for blue wire has 12 VDC and terminal for white
wire has 0 VDC.
5. Place metal object near sensing area of switch (op-
posite end from wires). Ground switch connector termi-
nal for black wire and apply 12 VDC to switch connector
terminal for red wire.
6. Using a multimeter, verify that switch connector ter-
minal for blue wire has 0 VDC and terminal for white wire
has 12 VDC.
7. Replace switch as needed.
Adjustment
NOTE: Deck Proximity Switch Adjustment Tool
(TOR4095) can be used for switch adjustment.
1. The sensing plate on side deck lift arms should be
0.060” to 0.120” (1.5 to 3.0 mm) from target surface of
position switch.
2. On front deck lift arm, slide sensing plate as far from
the lift arm as possible.
1. Position switch (front)
2. Sensing plate
3. Front lift cylinder
Figure 51
1
2
3
1. Position switch (side) 2. Sensing plate
Figure 52
1
2
Figure 53
BLACK
BLUE
WHITE
RED
CONNECTORSWITCH