Toro Groundmaster 31900, Service Manual

Page: 224 / 355

Parking Brake Switch
g306071
Figure 90
POSITION CLOSED
CIRCUITS
ENGAGED (brake
lever up)
1 + 3
DISENGAGED
(brake lever
down)
1 + 2
The parking brake switch is located under the brake lever cover on the left side
of the brake lever. A set of normally closed contacts in the switch are opened
when the parking brake is disengaged (brake lever down). Only two (2) of the
switch terminals are used in the parking brake switch circuit.
The TDM display/controller monitors the position of the parking brake switch.
The parking brake switch is part of the machine safety interlock system. Using
the parking brake switch position (open or closed) and a variety of other inputs,
the TDM display/controller manages a variety of machine functions.
Testing the Parking Brake Switch
The parking brake switch and its circuit wiring can be tested using the TDM
display/controller main information screens (brake icon); refer to
Using the
TDM Display/Controller Screens for Troubleshooting (page 3–12) . If testing
determines that the switch and circuit wiring are not functioning correctly,
proceed with the following test procedure:
1. Park the machine on a level surface, lower the cutting unit (or attachment),
engage the parking brake, set the key switch to the O
FF
position and remove
the key from the key switch.
2. Remove the 4 panel fasteners and remove the parking brake lever cover
from the machine.
3. Disconnect the machine wire harness from the switch. Check the switch
and the harness connector for damage or corrosion and clean or repair
if necessary.
4. Use a multimeter (ohms setting) to determine whether continuity exists
between the various terminals for each switch position.
Electrical System: Testing the Electrical Components Page 6–32 Groundsmaster ® 3200, 3300 and 3310
19240SL Rev A