Component Identification and Testing
SeeChapter5 -- ElectricalSystem(S/NBelow30101)
for additional Component Identification and Testing in-
formation. Only components that are different or new in-
formation is provided in this Chapter.
Electronic Control Unit (ECU)
TheToroelectronic controlunit(ECU)senses thecondi-
tion of various switches, such as the seat switch, cutting
unit down switches, traction neutral switch, etc., and di-
rects power output to allow certain machine functions,
such as engine run, cutting units engage, etc.
Because of the solid state circuitry built into the control-
ler, there is no method to test it directly. The controller
may be damaged if an attempt is made to test it with an
1
electrical test device, such as a volt--ohm meter.
IMPORTANT: Before welding on the machine, dis-
connect both battery cables from the battery, dis-
connect both wire harness connectors from the
electronic control unit and disconnect the terminal
connector from the alternator to prevent damage to
the electrical system.
Figure 7
1. Electronic control unit (ECU)
Neutral Switch (Model 30582 and 30583)
The neutral switch on model 30582 and 30583 is closed
when the traction pedal is in the neutral position. The
switch threads into the mounting cover on the bottom of
the hydrostat (Fig. 8).
Note:
For model 30580 and model 30581 neutral
switch information, refer to Traction (Neutral) Switch
Testing and Traction (Neutral) Switch Replacement and
Adjustment in Chapter 5.
NEUTRAL
SWITCH
1.
2.
3.
multimeter (ohms setting) across the connector termi-
nals.
Make sure the engine is off.
Disconnect electrical connector from the switch.
BOTTOM OF
HYDROSTAT
Check the continuity of the switch by connecting a
Figure 8
4.
should be continuity between the switch terminals.
With the traction pedal in the neutral position, there
5.
position, there should be no continuity between the
With the traction pedal in the the forward or backward
switch terminals.
Groundsmaster 580--D
Page 8 -- 11
Rev. G
Electrical System (S/N 30101 & Up) (Rev. E)
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