View Full Version : Mower Motor Quirks

05-23-2007, 07:41 PM
I wonder if anyone can shed some light on what causes mower motors to trip thermal switches. On both my mower decks I have certain motors that function for a period of time before cutting out, during a long mowing session. These same decks seem to have other motors that never cut out? What causes the motor to react differently in the same mowing sessions?


Bob K.

05-24-2007, 12:02 PM
Could be the breakers themselves, or something internal to the motor. Have you put an ammeter on the "good" motors and on the troublesome ones? I would compare the two readings. If they are very similar, I would suspect the circuit breakers. If they are different, I would suspect the motor itself (bearings, brushes, maybe armature). Of course, all this would be after making sure your blades are sharp and balanced.

Nick :cool: