Parking Brake Switch - Toro Reelmaster 3550-D Preliminary Service Manual

Parking Brake Switch

The parking brake switch is a normally open proximity
switch that is located on the control console (Fig. 30).
The sensing plate that closes the switch is the parking
brake lever.
When the parking brake is applied, the parking brake
lever is positioned near the target end of the parking
brake switch so the switch is closed. The parking brake
lever is moved away from the switch when the parking
brake is released causing the switch to open.
Sensor Testing
1. Park machine on level surface, lower cutting units,
stop engine, apply parking brake and remove key from
ignition switch.
2. Before disconnecting the parking brake switch for
testing, the switch and its circuit wiring should be tested
as a TEC electrical input using the Diagnostic Display
(see Diagnostic Display in the Troubleshooting section
of this chapter). If input testing verifies that the parking
brake switch and circuit wiring are functioning correctly,
no further switch testing is necessary. If, however, input
testing determines that the parking brake switch and cir-
cuit wiring are not functioning correctly, proceed with
the following switch testing procedure.
3. Remove cover from control panel to gain access to
parking brake switch.
4. Turn ignition switch to the ON position and check
LED on cable end of parking brake switch. LED should
be illuminated when the parking brake is applied. The
LED should not be illuminated when the parking brake
is released.
5. If the brake switch LED did not function correctly:
A. Make sure that when the parking brake is applied,
the clearance between the brake lever and the end of
the parking brake switch switch is 0.250" (6.3 mm). If
necessary, adjust switch and return to step 2 above.
B. Make sure ignition switch is OFF and disconnect
the parking brake switch connector from machine
wire harness.
Electrical System
C. Verify that the machine wire harness connector
terminal for black wire is closed (continuity) to
ground.
D. Turn ignition switch to the ON position (do not
start engine) and verify with a multimeter that ma-
chine wire harness connector terminal for pink wire
has system voltage (12 VDC) present.
E. If black wire is closed to ground, pink wire has
system voltage present and sensor LED did not func-
tion, replace parking brake switch. Torque brake
switch jam nuts from 165 to 195 in- -lb (18.7 to 22.0
N- -m) during installation. Make sure that there is
0.250" (6.3 mm) clearance between the brake lever
and the end of the parking brake switch after switch
installation is complete.
6. Install cover to control panel.
1
1. Parking brake lever
2. Brake switch
Page 5 - - 24
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Figure 30
3. Jam nut (2 used)
4. Lock washer (2 used)
Reelmaster 3550--D
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