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JACOBSEN AR3
SAFETY, OPERATORS & MAINTENANCE MANUAL
7 OPERATION
7.2 OPERATOR PRESENCE AND SAFETY INTERLOCK SYSTEM
1. The operator presence & safety interlock system prevents the engine from starting unless the
parking brake is on, and the mowing device is switched off. The system also stops the engine if the
operator leaves the seat with the mowing device engaged or the neutral latch depressed.
2. Perform each of the following tests to ensure the operator presence & safety interlock system is
functioning properly. Stop the test and have the system inspected and repaired if any of the tests
fail as listed below:
• The engine does not start in test 1;
• The engine does start during tests 2 or 3.
• The engine continues to run during test 4.
3. Refer to the chart below for each test and follow the check (9) marks across the chart. Shut engine
off between each test.
Test 1: Represents normal starting procedure. The operator is seated, parking brake is on, the
operators feet are off the pedals and the mower engagement device is off. The engine should start.
Test 2: The engine must not start if the mower engage device is on.
Test 3: The engine must not start if the Traction Pedal is depressed.
Test 4: Start the engine in the normal manner, then turn mower engage device on and lift your
weight off the seat.
Never operate the equipment with the
operator presence & safety interlock
system disengaged or malfunctioning. Do
not disconnect or bypass any switch.
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