We may have found other answers which could help you.
Click here for Front Wheel Drivetransmission sears 917.2555581?
Problems starting Lawn tractor (Sears Craftman)?
How do I set the float level in my carb?
Sears 151/2 46" automatic drive 917.256552?
Screaming tiller?
Mower cranks when primed, but after running a second or two dies?