there are safety cut-out switches in the wiring.
check wiring and trace where each one is,
put foot on clutch make sure brakes are on, out of gear, all are designed for your safety.
they also put one under the seat so the blades cannot rotate when no-one is on it.
vb
March 2015
with all the power off, check the blades and belt , make sure they are turning free, something is jamming the blades or belt turning, so it has to cut out
h
March 2015
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix lawn mowers.