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Possibly a bad switch under the seat. This is a safety feature that kills the motor if you overturn the mower. Unless the seat switch is made, the motor will not run with the blades engaged. There is also a switch on the blade engagement mechanism so the mower "knows" when they are engaged.
Normally you will start to hear a loud grumbling sound from underneath the mower when the blades are engaged. With the mower shut off, release the tension from the belt for the blades. Raise the deck so you can grab the blades from the bottom. You should not be able to rock the blades from side to side or up and down. If you can then you probably have a bad spindle. You can do this for wach of the spindles to check them all.
Let go of the "deadman" handle.
I have a 2003 Cub Cadet 1525. This model is designed to shut off the cutting deck when the tractor is put into reverse. Not sure what model you have but my guess is that it's just a safety precation like the Cub.
There's a safety switch under the seat. It will shut the tractor off if you get off the machine while the blades are engaged. It's not sensing your weight thinking you have fallen off the tractor.
If the fuel filter isn't clogged, the carburetor main needle valve may need to be adjusted.
The seat safety switch is not working properly correctly. If the safety does not sense that there is anyone on the seat then it will shut down the mower. This keeps the mower from running over someone if they would happen to fall off while mowing. Or if the safety is working you may have bad bearings on your deck and that will also stall your motor, or something jammed in the blades.
There are a number of reasons why the wiper blades my fail to shut off. This mainly a problem with the wiring system or malfunction of the wiper sensors.Ê
This is typically caused by a bad seat safety switch. The safety switches are setup so that if the rider falls off the mower it will shut down. That way the rider does not get run over. So, if it senses that there is no one on the seat it will shut down when engaged.
There is a nice Yellow Knob on the right hand side of steering wheel when you pull it out your PTO(Power Take Off) part that makes blades engage when hooked up right. To shut blades off just push know back in. Hopefully that helps and good luck with the mower. I have had mine 10 years it has never once had an issue.
There could be many reasons why your Sears riding lawn mower won' shut off. The key could be jammed for example.
engine is stalling because revs aren't high enough for the load, try lowering the deck on short grass