Safety Interlock System - Simplicity RTH Series Operator's Manual

Operation
SAFETY INTERLOCK SYSTEM
Your tractor is equipped with a seat switch safety system that
will automatically shut the engine off when the operator
leaves the seat with the PTO engaged or with the
transmission lever in gear. The tractor engine will continue
to run when the operator leaves the seat if the PTO is
disengaged and the transmission is in neutral.
Check the seat switch (A, figure 9) every fall and spring with
the following three tests. Make sure the wiring harness (B) is
securely plugged into the switch.
WARNING
If the tractor does not pass the test, do not operate
tractor. See your authorized dealer. Under no
circumstance should you attempt to defeat the
purpose of the safety system.
Test 1 — Engine should not crank if:
A. Seat not occupied, or;
B. Transmission lever of of neutral, or;
C. PTO engaged.
Test 2 — Engine should crank if:
A. Seat is occupied, and;
B. Transmission lever in neutral, and;
C. PTO disengaged.
Test 3 — Engine should shut off if:
A. Operator rises off seat with transmission in gear, or;
B. Operator rises off seat with PTO engaged.
Figure 9. Seat Switch
A. Seat Switch
B. Wiring Harness