Starter Motor will not disengage

[Dave the Farmer 0]

I have a Toro Wheel Horse Model  73429   Serial #8901097,  314–8 Garden Tractor . I was mowing for 4 hours yesterday, and when I turned off the ignition, the engine stopped but the starter motor continued to hum and would not disengage until I finally disconnected the battery. What can I do to solve this problem.

[Sparky-(Admin) 21,352]

  That sounds like a bum ignition switch or the solenoid has “stuck” closed. 
  If you reconnect the battery does the starter engage? 
 

[Dave the Farmer 0]

Thanks Sparky! When I reconnected the battery, the tractor attempted to start so I disconnected it again. 

[gwest_ca-(File Mod) 11,070]

Sure it is not a model 73448?

 

[Dave the Farmer 0]

The Model # is actually 73428, Serial #8901097. Sorry for the confusion.

[gwest_ca-(File Mod) 11,070]

57 minutes ago, Dave the Farmer said:

The Model # is actually 73428, Serial #8901097. Sorry for the confusion.

So it is a 312-8 model

 

[Dave the Farmer 0]

Thanks for the wiring diagram.

 

[953 nut 55,393]

8 hours ago, Sparky said:

sounds like a bum ignition switch

Bad interlock relay or ignition switch, relays seldom go bad so it is probably the ignition switch keeping the interlock relay and kill relay energized.

[rwmastel 47]

@gwest_ca

Doesn't his serial number mean it's a 1989 model year?  You keep posting newer 1998 documentation.

[953 nut 55,393]

6 hours ago, rwmastel said:

@gwest_ca

Doesn't his serial number mean it's a 1989 model year?  You keep posting newer 1998 documentation.

 1998 312-8 Early model73428

[gwest_ca-(File Mod) 11,070]

With this type of serial number you reverse the first two digits to get the model year.

Up to and including 1989 the hood decals had a maroon background.

In 1990 on the hood decals had a black background.