Posted by Janicholson on June 21, 2010 at 21:11:34 from (64.61.211.60):
In Reply to: Starters 101 posted by Dave H (MI) on June 21, 2010 at 18:38:38:
I will add some to the info: The motor is a series wound high torque DC motor.Series means it has a single path for electricity. From the terminal on the outside (or contact stud under the start switch) the current flows through the field windings (first one winding, then the other) then it goes to the brushes where it then travels through armature windings, and back to brushes to ground. This motor type is designed to operate one direction only as a starter motor. and will not go backwards with a change in polarity. They are intermittent duty. meaning they will get hot if used for long periods (one minute), or for more than about 10% of total time, in use as a starter. They are also very close to zero resistance. with an ohm meter applied to the post and ground. They can draw as much as 500 to 600 amps on larger equipment. more like 250 to 275 for your engine. A starter solenoid is not on your tractor. It has a mechanical switch, and as described below an inertial drive pinion. A solenoid is an electrical to mechanical (linear motor) that moves some device, valve, or starter pinion. They often also provide high current switching to the starter allowing much smaller wires for the push button or key. Yours has a rod to activate the mechanical switch. A starter relay (often mistakenly called a solenoid) is a small can like device on the starter that is only a remote switch, not a pinion moving device. It has only wires connected to it. Jim
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