My ZTS 7500 is model 950.287900. It is the 50" cut with a 26 HP Extended Life B&S engine. According to the owners manual the engine should shut off if I leave the seat with the PTO engaged.
It will not shut the engine off when I get out of the seat. All the safety switches that prevent if from starting work as they should. In other words if either steering handle is not in the park position the starter will not engage. If the PTO switch is turned on the starter will not engage. After it is started no combination of anything seems to shut the engine off when I leave the seat.
History: When I got the mower the previous owner had presumably disabled the seat switch by unplugging it and connecting the wires together. This, as far as I can tell, should have prevented the engine from running at all. I have reconnected the two wires to the seat switch. The switch opens and closes when you press on the seat cushion. The seat switch is normally closed and pressing on the seat causes it to open. Checking wires with ohm meter, one side is spliced to ground and the other is spliced to the M terminal on the ignition switch. This seems to match the wiring diagram I found. (attached)
The best I can tell everything is working as it should except the engine remains running with the seat switch closed or open. I was thinking it might be in the ignition switch. The ignition switch starts and stops the engine but it does have a slight delay in shut down after turning the switch off. When the seat switch closes by getting out of the seat it sends a ground to the M terminal of the ignition switch. I installed a new ignition switch and no change.
Any help in how this system operates would be appreciated. I don't want myself or anyone else to accidentally stick their foot under a deck while the blades are engaged.
It will not shut the engine off when I get out of the seat. All the safety switches that prevent if from starting work as they should. In other words if either steering handle is not in the park position the starter will not engage. If the PTO switch is turned on the starter will not engage. After it is started no combination of anything seems to shut the engine off when I leave the seat.
History: When I got the mower the previous owner had presumably disabled the seat switch by unplugging it and connecting the wires together. This, as far as I can tell, should have prevented the engine from running at all. I have reconnected the two wires to the seat switch. The switch opens and closes when you press on the seat cushion. The seat switch is normally closed and pressing on the seat causes it to open. Checking wires with ohm meter, one side is spliced to ground and the other is spliced to the M terminal on the ignition switch. This seems to match the wiring diagram I found. (attached)
The best I can tell everything is working as it should except the engine remains running with the seat switch closed or open. I was thinking it might be in the ignition switch. The ignition switch starts and stops the engine but it does have a slight delay in shut down after turning the switch off. When the seat switch closes by getting out of the seat it sends a ground to the M terminal of the ignition switch. I installed a new ignition switch and no change.
Any help in how this system operates would be appreciated. I don't want myself or anyone else to accidentally stick their foot under a deck while the blades are engaged.
