7 OPERATION
en-25
7.2 INTERLOCK SYSTEM ______________________________________________________
The Interlock System prevents the engine to start unless the steering control levers are in the Neutral position, the
parking brake is engaged and the PTO switch is in the OFF (Down) position. The system stops the engine if the
operator leaves the seat with the PTO switch in the ON position, steering control levers out of the NEUTRAL position or
the parking brake disengaged.
Do each of these tests to make sure the Interlock System operates correctly. If any of the tests fail, stop the test and
have the system inspected and repaired as shown below:
• The engine does not start during test 1
• The engine does start during tests 2, 3 and 4
• The engine continues to run during tests 5 and 6
Refer to the chart below for each test and follow the check () marks across the chart. Turn off the engine between
each test.
TEST 1: The test shows the normal engine start procedure. The operator is in the seat, parking brake is engaged, the
steering control levers are in the NEUTRAL position and the PTO switch is in the OFF (down) position. The engine will
start.
TEST 2: The engine must not start if the PTO switch is in the ON position.
TEST 3: The engine must not start if the parking brake is disengaged.
TEST 4: The engine must not start if the steering control lever(s) is out of the NEUTRAL position.
TEST 5: Start the engine with the normal procedure. Turn on the PTO switch and lift your weight off the seat. The
engine must stop. The cutting unit blades must not rotate after seven (7) seconds.
TEST 6: Start the engine with the normal procedure. Disengage the parking brake and lift your weight off the seat. The
engine must stop. The cutting unit blades must not rotate after seven (7) seconds.
WARNING
Do not operate the equipment with the Interlock System disconnected or the system does not operate correctly. Do
not disconnect or prevent the operation of any switch.
Test
Operator Seated
PTO Switch OFF Parking Brake
Engaged
Steering Control
Levers in Neutral
Engine Starts
YesNoYesNoYesNoYesNoYesNo
1
2
3
4
5
6
Start the engine with the normal procedure, move position of the switch and lift your weight off the seat.
The engine must stop immediately and the cutting unit blades must not rotate after seven (7) seconds.
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