Engine grass hopper 721 gas won't crank

[fickit man]

I have a 721 grasshopper and it will not crank when trying to start it. Have all ready verified voltage and replaced the start switch. I have no voltage to the blue wire on the start switch or across the center fuse. When I turn the key on I get a hum sound in the back either from the starter or clutch. ....

 

[173abn]

are your steering levers pushed all the way out?also safety switchs for each lever.one or both could be bad...russ

 

[bobbysr]

My 729T acted up the same way. It was a bad PTO switch.