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My yth 170 cutter is always on, the switch does not disengage cutter. Checked all connections and got a new switch still cutter cannot be turned off until engine is turned off.

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I would venture to guess you have a bad pto clutch

Posted on Oct 20, 2013


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Husqvarna yth 170 problems when engage blades clutch nothng happens

On the 170 there is an electrical clutch that enables the blades to engage. This of course is an important safety feature.

If the operator is not sitting in the seat the switch located beneath the seat will not actuate. It is possible that the weight of the operator is insufficient to activate the switch. Other possibilities are the connection to the switch has become disengaged, or the switch has failed.

There are other possibilities of why the blades do not engage but I would evaluate the seat switch first and the relay (operator presence relay) that the seat switch activates second..

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could be a safety switch add a light to the plug that goes to the clutch and see if it goes out when the blades shut off this will tell you if its before or after the switches

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Sounds like the cutter is not turning free causing the engine to drag down and stop, I do not think the B&S engine is the problem. I have rebuilt dozens of these engines and most of the problems with a Briggs engine was dirt in the gas or carburetor that needed needle valve cleaned . If the cutters turn free, check for a bad or out of adjustment safety kill switch that engages and stops the engine as the cutters are engaged.

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If I understand, you were mowing and it just stopped running. The motor didn't sieze up, it turns over. Okay and you have spark, and you have gas, have you checked the safety switches. there is one under the seat, the blades, the brake pedal when starting. Make sure that these safety switches are working properly. that is the next step I would take.

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