Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model Logo
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lisa clark Posted on May 17, 2014

Why does engine die when brake released or mower engaged?

Have mowed once this year with no problems. new battery put in, no mice in engine. starts fine but dies when brake released or mower deck engaged. thought engine would not start if switch in seat not activated

2 Answers

A

Anonymous

You likely have a faulty operator presence seat switch. This switch is designed to shut down the engine if the operator leaves the seat without shutting off the PTO and engaging the parking brake. An easy way to tell if the seat switch is bad is unplug the switch from the wiring harness receptacle. Jumper the wiring harness receptacle. Start the engine and disengage the brake. Engage the blades. If the engine doesn't shut off, replace the seat switch. They're not expensive, and you really should keep all your mower's safety features operational to help protect you from any potential liability.

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  • Posted on May 17, 2014
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The first thing I would check is to make sure the drive belt is not binding somewhere.

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Anonymous

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  • Posted on Mar 12, 2009

SOURCE: I have 16 hp Craftsman riding mower with a Kohler engine.

It may think you are in reverse and is killing the motor to keep you from backing up with the blade running. Look for switch that is telling it when you are in reverse, maybe it is stuck with grass or other debris. another possibility is that the blades are jammed and they are stalliing the motor. Mines stalls easily when cold.

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Anonymous

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  • Posted on Apr 18, 2010

SOURCE: STARTS GOOD BUT ENGINE DIES WHEN CLUTCH RELEASED

cut the wires running to the switch...try again...if same, stripp back wires, and twist together...wrap in tape or use some sort of connector...it's electric and should be treated as such...try again...still ?? Start finding those switches and repeat the process til it works...theres usually 3 or 4...

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The power sequence for engaging the blade deck is. Clutch brake pedal depressed, operator in seat, Enage selected and brake pedal released. When the blade enages the engine igniton kill wire is routed through the seat switch AND the PTO clutch. If either the PTO Clutch or the seat switch has a problem the engine dies. Same goes for the clutch brake pedal switch... if the clutch brake is not coming all the way up the engine will die.

If you respond with a model number (example LX2000) I can show via a manual where you need to troubleshoot using a meter.

Do a couple of good bounces on the seat, check the clutch brake pedal switch for clicks and then attempt to an engagement.

Also inspect the PTO clutch wires and connectors for corrosion.

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