Enable/Disable Switch - Toro Reelmaster 3550-D Preliminary Service Manual

Enable/Disable Switch

The enable/disable switch is located on the control
panel (Fig. 21). This switch is pulled out to engage the
cutting units and pushed in to disengage the cutting
units.
The TEC controller monitors the position of the enable/
disable switch (pulled out or pushed in). Using inputs
from the enable/disable switch and other switches in the
interlock system, the TEC controller controls the ener-
gizing of the hydraulic solenoid valves used to drive the
cutting unit motors.
NOTE: To engage the cutting units, the seat has to be
occupied, the mow/transport slide has to be in the mow
position and the cutting units have to be fully lowered.
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 enable/disable 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 enable/
disable switch and circuit wiring are functioning correct-
ly, no further switch testing is necessary. If, however,
input testing determines that the enable/disable switch
and circuit wiring are not functioning correctly, proceed
with the following switch testing procedure.
3. Remove cover from control panel to gain access to
enable/disable switch.
4. Disconnect wire harness electrical connector from
the enable/disable switch.
5. The enable/disable switch terminals are marked as
shown in Figure 22. The circuit logic of the enable/dis-
able switch is shown in the chart in Figure 23. With the
use of a multimeter (ohms setting), the switch functions
can be tested to determine whether continuity exists be-
tween the various terminals for each switch position.
Verify continuity between switch terminals. Replace en-
able/disable switch if testing identifies that switch is
faulty.
6. If the enable/disable switch tests correctly and circuit
problem still exists, check other circuit components (see
Electrical Schematic in Chapter 8 -- Foldout Drawings).
Electrical System
7. After testing is completed, connect the wire harness
connector to the enable/disable switch. Install control
panel cover.
2
1. Control panel
1. COM B terminal
2. NO B terminal
3. NC B terminal
SWITCH
POSITION
OFF (DOWN)
ON (UP)
Page 5 - - 20
Figure 21
2. Enable/disable switch
4
5
6
Figure 22
4. COM C terminal
5. NO C terminal
6. NC C terminal
CLOSED OPEN
CIRCUITS CIRCUITS
COM B + NC B COM B + NO B
COM C + NC C COM C + NO C
COM B + NO B COM B + NC B
COM C + NO C COM C + NC C
Figure 23
Reelmaster 3550--D
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