Service Brake Switches - Toro Groundsmaster 4000-D Service Manual

Service Brake Switches

The two (2) switches used for the service brakes are nor-
mally open switches that are located under the footrest
panel (Fig. 43). The service brake switches provide in-
puts for the TEC controller. When a brake pedal is not
depressed, the brake pedal assembly contacts the
switch plunger to close the switch. When a brake is ap-
plied, the brake pedal assembly moves away from the
switch plunger, allowing the switch plunger to extend
and the switch to open.
Testing
1. Before disconnecting a service brake switch for test-
ing, the switch and its circuit wiring should be tested as
a TEC input with the InfoCenter Display (see InfoCenter
Display in this chapter). If the InfoCenter verifies that the
brake switch and circuit wiring are functioning correctly,
no further switch testing is necessary. If, however, the In-
foCenter determines that the brake switch and circuit
wiring are not functioning correctly, proceed with test.
2. Make sure ignition switch is OFF. Remove key from
ignition switch.
3. Remove brake cover and switch plate on operator
platform to access service brake switches (Fig. 43).
4. Disconnect switch electrical connector from the ma-
chine wire harness.
5. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the connector termi-
nals.
6. When the service brake switch plunger is depressed,
there should be continuity (zero resistance) between
the switch terminals.
7. When the service brake switch plunger is extended,
there should be no continuity (infinite resistance) be-
tween the switch terminals.
8. Replace service brake switch if necessary.
9. Connect switch electrical connector to the machine
wire harness after testing. Secure brake cover and
switch plate to operator platform.
Adjustment
Adjust the service brake switch so that the switch plung-
er always makes full contact with the brake pedal. Tight-
en fasteners from 13 to 17 in- -lb (1.5 to 1.9 N- -m).
Groundsmaster 4000--D/4010--D
3
1
1. Flange screw (3 used)
2. Cover
3. Switch bracket
4. Brake switch (2 used)
Page 5 - - 39
13 to 17 in- -lb
(1.5 to 1.9 N- -m)
2
5
4
6
7
Figure 43
5. Screw (2 per switch)
6. Switch nut (2 used)
7. Clip (3 used)
Electrical System