Toro 41188, Руководство по обслуживанию

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Multi Pro 1750
Page 5 − 37
Electrical System
Clutch, Throttle Home and Service Brake Switches
The switches used for the clutch, throttle home and ser-
vice brake are the same, normally open switch. These
switches are attached to the platform frame (Fig. 37).
When the clutch, throttle home, or service brake pedal
is depressed, the switch plunger is extended so the
switch is open. The switch closes when the pedal is re-
leased.
The Toro Electronic Controller (TEC) monitors the op-
eration of these three (3) switches (inputs).
The clutch switch is used in the engine run interlock
system to make sure that the clutch pedal is fully de-
pressed (disengaged) if the neutral switch is out of
neutral and the parking brake is engaged, preventing
the Operator from driving the machine with the park-
ing brake engaged. The clutch switch position is also
used in the throttle lock, speed lock, and hill assist
systems.
The throttle home switch is used in the engine start
interlock system to make sure that the throttle pedal
is fully released (at low idle) while the engine is being
started.
The service brake switch position is used in the throt-
tle lock, speed lock, and hill assist systems. The ser-
vice brake switch is also used to activate the optional
brake light.
Testing
The clutch and throttle home switch and their circuit wir-
ing can be tested as TEC qualifiers using the InfoCenter
Display (see InfoCenter Display − Diagnostics Screen in
this chapter). If testing determines that the switch and its
circuit wiring are not functioning correctly, proceed with
the following test procedure:
1. Park machine on a level surface, stop spray pump,
stop engine and engage parking brake. Remove key
from ignition switch.
2. Locate switch that is to be tested and disconnect the
wire harness connector from the switch.
1. Clutch switch
2. Throttle home switch
3. Service brake switch
Figure 37
1
2
3
3. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the connector termi-
nals.
4. When the switch plunger is extended there should
not be continuity (infinite ohms resistance) between the
switch terminals.
5. When the switch plunger is depressed, there should
be continuity (zero ohms resistance) between the switch
terminals.
6. Replace switch if testing determines that it is faulty.
7. If the switch tests correctly and a circuit problem still
exists, check wire harness (see Electrical Schematic
and Wire Harness Drawings in Chapter 10 − Electrical
Drawings in this manual).
8. After testing is completed, reconnect wire harness
connector to switch.
9. Make sure the pedal contacts the switch and comes
to rest against the hard pedal stop when released.
Electrical
System