Parking Brake Switch
The parking brake switch is a normally open proximity
switch. The parking brake switch is attached to the bot-
tom of the RH brake pedal (Fig. 28).
Whentheparkingbrakeisnotapplied,theparkingbrake
detent is positioned near the target end of the parking
brake switch so the switch is closed. The parking brake
detent is moved away from the switch when the parking
brake is applied causing the switch to open.
Switch Testing
1
1.
Park machine on a level surface, lower cutting
decks, stop engine.
2
2.
Before disconnecting the parking brake switch for
testing, the switch and its circuit wiring should be tested
as a TEC input with the Diagnostic Display (see Diag-
nostic Display in the Troubleshooting section of this
chapter). Ifthe Diagnostic Display verifies thatthebrake
switch andcircuit wiring arefunctioning correctly,nofur-
ther switch testing is necessary. If, however, the Display
determines that the brake switch and circuit wiring are
not functioning correctly, proceed with test.
3
6
4
5
Figure 28
3.
ignition switch.
Make sure ignition switch is OFF. Remove key from
1.
2.
3.
RH brake pedal
Brake detent
Carriage screw
4.
5.
6.
Switch plate
Brake switch
Lock nut
4.
Disconnect wire harness electrical connector from
the parking brake switch.
5.
multimeter (ohms setting) across the connector termi-
nals.
Check the continuity of the switch by connecting a
1
2
6.
plied), there should be continuity (closed) between the
switch terminals.
When the parking brake is released (brake not ap-
7.
applied), there should not be continuity (open) between
the switch terminals.
When the parking brake pedal is depressed (brake
Figure 29
1.
Brake switch
2.
Switch target area
NOTE: When installing the parking brake switch to the
brake pedal, place switch plate tab into switch mounting
hole that is closest to target end of switch (Fig. 29).
8.
Replace parking brake switch if testing determines
that it is faulty.
9.
After testing is complete, connect wire harness elec-
trical connector to the brake switch.
Groundsmaster 4500--D/4700--D
Page 5 -- 23
Electrical System
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