Service Manual

Groundsmaster 4500−D/4700−DPage 5 − 12Electrical System
Diagnostics Screen
The diagnostics screen (Fig. 15) lists the various states
of machine electrical components. The diagnostics
screen should be used to check operation of machine
controls and to verify that switches and circuit wiring are
functioning correctly.
For each of the diagnostics screen items, inputs, qualifi-
ers and outputs are identified.
The diagnostics screen includes the following:
 Left Deck (Groundsmaster 4700−D) identifies ma-
chine requirements to allow the left deck to raise and
lower. Inputs indicate the state of the left deck lift/lower
switch and whether the machine is in low range speed.
Qualifiers include the low range speed, seat switch and
parking brake position. Identified outputs consist of
master, lower, raise and float solenoids.
 Center Deck identifies machine requirements to al-
low the center deck to raise and lower. Inputs indicate
the state of the center deck lift/lower switch. Qualifiers
include the low range speed, seat switch and parking
brake position. Identified outputs consist of master,
raise and float solenoids.
 Right Deck (Groundsmaster 4700−D) identifies ma-
chine requirements to allow the right deck to raise and
lower. Inputs indicate the state of the right deck lift/lower
switch. Qualifiers include the low range speed, seat
switch and parking brake position. Identified outputs
consist of master, lower, raise and float solenoids.
 Traction Pedal identifies position of the traction ped-
al. Inputs indicate the state of the traction pedal poten-
tiometer. Outputs indicate whether the traction circuit is
in forward, neutral or reverse.
 Traction identifies machine requirements to allow
the traction system to be engaged. Inputs indicate the
state of the traction pedal. Qualifiers include the seat
switch and parking brake position. Outputs indicate
whether the piston (traction) pump is engaged in for-
ward or reverse.
 Hi/Low Range identifies machine requirements to
allow high or low speed range to be engaged. Inputs in-
dicate whether the PTO is off and the state of the hi/low
switch. Qualifiers identify the position of the cutting
decks (raised or lowered). Outputs indicate whether
high range is engaged (solenoid S12 is energized).
 PTO identifies machine requirements to allow the
PTO to be engaged. Inputs indicate the state of the PTO
switch. Qualifiers identify whether low speed range is
selected, if the seat is occupied and if the cutting decks
are lowered. Outputs indicate which cutting decks are
engaged.
 Engine Run identifies whether necessary TEC out-
puts exists to allow the engine to run. Inputs indicate the
state of the ignition switch. Qualifiers identify whether
the PTO is off, if the traction pedal is in neutral, if the seat
is occupied (or parking brake is applied) and if all deck
lift switches are not activated. Outputs indicate that re-
quirements have been met to allow engine to run or
start. NOTE: The components for engine operation (e.g.
glow plugs, starter) are controlled by the Yanmar engine
control unit (ECU).
To return to the main menu screen from the diagnostics
screen, press the back button (left button).
1. Diagnostics menu
2. Diagnostics items
3. Move to menu items
4. Choose menu item
5. Back button
Figure 15
Diagnostics
Left Deck
Center Deck
Right Deck
1
5
3
4
5
2
3
4