SAFETY
Safety - 17
Testing the Safety Interlock System (continued)
Tests 5-9 test the ‘Engine Run’ function. For each test, start the power unit so that the engine is running. As
listed for each test, engage or disengage the parking brake*, place the SDLA in neutral or out of neutral^, and
sit on the seat or raise your body weight from the seat. The engine should continue running or stop running as
described for each test.
Engine
Run
Test
Number
Parking Brake*
Engaged
(SDLA) in Neutral^
Operator Present in Seat Engine Runs
5 Yes Yes Yes Yes
6 Yes Yes No Yes
7 Yes No No No
8 Yes No Yes No
9 No Yes No No
Tests 10-13 test the ‘PTO’ function. For each test, turn the ignition key to the RUN position (do not start the
engine). As listed for each test, place the PTO switch in the On or OFF position and sit on the seat or raise your
body weight from the seat. The electric PTO clutch will make an audible noise when it engages or disengages.
PTO
Test
Number
PTO Switch Operator Present in Seat PTO Clutch
10 O Yes O
11 Pull to ‘On’ Position No No
12 Pull to ‘On’ Position Yes Yes
13 On
Raise Operator Body
Weight from Seat
PTO Disengages
(1/2 second delay)
If the power unit fails any one of the safety interlock tests, refer to the troubleshooting section for using the
TCM (tractor control module) to diagnose electrical problems.
* This tests the function of the parking brake switch. The parking brake handle should be engaged the minimum amount necessary to activate the parking
brake indicator light on the warning gauge. Neutral assist must be o.
^ This tests the function of the neutral switch located on the hydraulic pump. Depending on settings and the age of the power unit, the range for neutral for
the SDLA control may vary. For this test, the SDLA lever should move 2.5 cm (1 inch) or less forward or backward for neutral switch activation (measured at
the top of the lever).
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