Using the Safety-Interlock
System
W ARNING
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 the following occurs:
• The parking brake is engaged.
• The blade-control switch (PT O) is disengaged.
• The motion-control levers are in the N EUTRAL - LOCK
position.
The safety-interlock system also is designed to shut
of f the engine when the motion-control levers are
moved from the N EUTRAL - LOCK position with the
parking brake engaged or if you rise from the seat
when the PT O is engaged.
The hour meter has indicators to notify the user when
the interlock component is in the correct position.
When the component is in the correct position, an
indicator displays on the screen.
g009181
Figure 9
Standard hour meter shown
1. Indicators display when the interlock components are in the
correct position.
g231781
Figure 10
Smart hour meter shown
1. Indicators display when the interlock components are in the
correct position.
T esting the Safety-Interlock
System
Service Interval : Before each use or daily
T est 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. Sit on the seat, engage the parking brake, and
move the blade-control switch (PT O) to the O N
position. T ry starting the engine; the engine
should not start.
2. Sit on the seat, engage the parking brake, and
move the blade-control switch (PT O) to the O FF
position. Move either motion-control lever out
of the N EUTRAL - LOCK position. T ry starting the
engine; the engine should not start. Repeat for
the other control lever .
3. Sit on the seat, engage the parking brake,
move the blade-control switch (PT O) to the O FF
position, and move the motion-control levers
to the N EUTRAL - LOCK position. Now start the
engine. While the engine is running, disengage
the parking brake, engage the blade-control
switch (PT O), and rise slightly from the seat; the
engine should shut of f.
4. Sit on the seat, engage the parking brake,
move the blade-control switch (PT O) to the O FF
position, and move the motion-control levers
to the N EUTRAL - LOCK position. Now start the
engine. While the engine is running, center
either motion control and move (forward or
reverse); the engine should shut of f. Repeat for
other motion control.
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