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Inbuilt breaker disconnects power to the motor, motor is cool.

Electric corded mower works well except its thermal coupler?? keeps shutting the machine down even under a light load. This is a thin white pin on the switch that pops up when the machine is overheated, supposedly. Could it be so worn it disconnects too easily and can it be replace easily? Blades sharp and underbody clean. Thank you

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If it is tripping as much as you say, it needs to be replaced..... just as a breaker in your house, if it starts popping all the time and there is no problem you have to replace it. replacing it is not all that hard, if you are handy with tools. finding it maybe a little harder. you can check at local mower repair shops. with it unplugged, make sure the blade turns without binding also.

Posted on Feb 03, 2010

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The following electrical components (if so equipped) will only operate when your
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Light keeps blinking

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My story is the same. I have an MM600, replaced switch, and still trips breaker in variety of configurations. I have tried both of the relevant configs recommended on this site, and no luck. Is there...

As you know a breaker tripping is a result of a direct short inside the electrical circuity of your mower.

That short can be anywhere from just beyond the switch all the was down to the winding in the motor.

There are 2 switches Item 3 and Item 7 of this link:

Places for a short are the power wire from the switch to the motor connection. (Item 28 of link)

A broken motor brush where the carbon brush has broken off and the metal from the spring is now touching wither the motor chassis or across multiple segments of the armature.

Check items 46, 47, 48, 48 this link for damage:

Also check Item 80 Brush of the above link (picture below link

A bearing in the motor can have failed allowing the armature Item 65 of link to drag on the stator item 70 of link and cause a stator short where the armature damaged the stator winding.

The above items are all things that can cause your problem. It will take a multi-meter and some resistance checks of the circuit to isolate exactly where the short is.

I would connect the meter across the 2 power cord terminals i.e unplugged and simulate mower use then start disconnecting wires one at a time working my way backward from the motor to see when the short disappeared. If the short is in the motor... then we are back to all of the times above except the cord and switches. The all have to be isolated and checked out.


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Thermal occurrence, the computer keeps shutting down and sending a message of thermal occurrence.

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