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Checking the
Safety-Interlock System
The purpose of the safety-interlock system is to
prevent the engine from cranking or starting unless
the traction pedal is in neutral, the PTO switch is in
the O
position, the parking brake is engaged, or the
FF
operator is in the seat.
In addition, the engine should shut off when:
•
The operator leaves the seat with the PTO switch
in the O
position;
N
•
The operator leaves the seat with the traction
pedal out of neutral;
•
The traction pedal is pressed with the parking
brake engaged.
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.
Checking the Engine Cranking
Safety-Interlock System
Service Interval: Before each use or daily
Check the operation of the safety-interlock switches
by ensuring the following:
Engine Cranking Interlock Table
Conditions
Parking brake disengaged
Traction pedal in neutral
PTO switch in the O
position
FF
No operator in the seat
Parking brake disengaged
Traction pedal in neutral
PTO switch in the O
position
FF
Operator in the seat
Parking brake disengaged
Traction pedal pushed down
PTO switch in the O
position
FF
Operator in the seat
Result
The engine should not crank.
The engine should crank.
The engine should not crank.
Engine Cranking Interlock Table (cont'd.)
Conditions
Parking brake engaged
Traction pedal pushed down
PTO switch in the O
FF
Operator in the seat
Parking brake engaged
Traction pedal in neutral
PTO switch in the O
FF
No operator in the seat
Checking the Engine Shut-Off
Safety-Interlock System
Service Interval: Before each use or daily
Before doing the following checks, perform the
following:
1.
Sit in the operator's seat.
2.
Engage the parking brake.
3.
Move the traction pedal to neutral.
4.
Disengage the PTO.
5.
Start the engine.
6.
Disengage the parking brake.
Check the operation of the safety-interlock switches
by ensuring the following:
Engine Shut-Off Interlock Table
Conditions
Parking brake disengaged
Operator rises slightly from
the seat
Parking brake engaged
Operator rises slightly from
the seat
Parking brake engaged
Operator in the seat
Traction pedal pushed down
Parking brake disengaged
Operator in the seat
Traction pedal pushed down
23
Result
The engine should not crank.
position
The engine should crank.
position
Result
The engine should shut off.
The engine should continue to
run.
The engine should shut off.
The engine should continue to
run.
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