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The Safety Interlock System
CAUTION
If the safety interlock switches are disconnected or
damaged the machine could operate unexpectedly
causing personal injury.
• Do not tamper with the interlock switches.
• Check the operation of the interlock switches
daily and replace any damaged switches before
operating the machine.
Understanding the Safety Interlock
System
The safety interlock system is designed to prevent the engine
from starting unless:
•
You are sitting on the seat or the parking brake is engaged.
•
The power take off (PTO) is disengaged.
•
The traction pedal is in the neutral position
•
The engine temperature is below the maximum operating
temperature.
The safety interlock system also is designed to stop the engine
when the traction pedal is moved from the neutral position
with the parking brake engaged. If you rise from the seat
when the PTO is engaged there is a 1 second delay and then
the engine stops.
Testing the Safety Interlock System
Service Interval: Before each use or daily
Test the safety interlock system before you use the machine
each time. If the safety system does not operate as described
below, have an Authorized Service Dealer repair the safety
system immediately.
1. Sitting on the seat, engage the parking brake and move
the PTO to on. Try starting the engine; the engine
should not crank.
2. Sitting on the seat, engage the parking brake and move
the PTO to off. Engage the traction pedal. Try starting
the engine; the engine should not crank.
3. Sitting on the seat, engage the parking brake, move
the PTO switch to off and allow the traction pedal to
return to the neutral position. Now start the engine.
While the engine is running, release the parking brake,
engage the PTO and rise slightly from the seat. On two
wheel drive machines, the engine should stop within 2
seconds. On four wheel drive machines, the mower
deck will shut off. The engine will continue to run.
4. Without an operator on the seat, engage the parking
brake, move the PTO switch to off and move the
traction pedal to the neutral position. Now start the
engine. While the engine is running, engage the traction
pedal; the engine should stop within 2 seconds.
5. Without an operator on the seat, disengage the parking
brake, move the PTO switch to off, and allow the
traction pedal to return to the neutral position. Try
starting the engine; the engine should not crank.
Using the SCM to Diagnose System
Problems
2 wheel drive models only
The machine is equipped with a standard control module
(SCM) monitoring system that tracks the function of various
key systems. The SCM is located under the seat.
On the face of the SCM are 11 LEDs that illuminate to
indicate various system conditions. Seven of these lights can
be used by the operator for system diagnosis. Refer to Figure
19 for a description of what each light means. For details
on using the rest of the SCM functions, refer to the Service
Manual, available through your Authorized Toro Distributor.
1. High temperature shutdown—the engine temperature has
exceeded safe levels and the engine has been shut down.
Check the cooling system.
2. High temperature warning—the engine temperature is
approaching unsafe levels and the PTO has been shut
down. Check the cooling system.
3. Operator is in the seat
4. The PTO is On
5. The parking brake is not engaged
6. Controls are in Neutral
7. The SCM is receiving power and is operational
Understanding the Diagnostic
Light
(4 Wheel Drive only)
The machine is equipped with a diagnostic light which
indicates if the electronic controller senses an electronic
malfunction. The diagnostic light is located on the control
panel (Figure 20). When the electronic controller is
functioning correctly and the key switch is moved to the
On position, the controller diagnostic light will turn ON
for 3 seconds and turn OFF to indicate the light is working
25
Figure 19
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