MTD 700 Series - Start Circuit

Series 700 Lawn Tractor
104
Start Circuit
NOTE: The start circuit is the same for all three electrical systems.
Turning the key to the START position:
• Spins the starter motor
• Enables the ignition
• Energizes the afterfire solenoid
Looking at the circuit that sends power to the starter motor: See Figure 7.18.
1. When the key switch is in the START position, battery power is passed from the B terminal to the S terminal.
2. Power goes from the key switch S terminal to the brake switch N.O. contacts. (orange wire)
2a. If the brake is off, the switch plunger will be up and the N.O. contacts will be open.
2b. If the brake is on, the switch plunger will be depressed, and the N.O. contacts will be closed. Power will
be passed along to the PTO switch.
3. When the key is in START, and the brake is on, power will continue to the N.C. terminal of the PTO switch
(orange/black trace).
3a. If the PTO is on, the switch plunger will be depressed, and the N.C. set of contacts will not be open.
3b. If the PTO is off, the switch plunger will be up and the N.C. set of contacts will be closed. Power will be
passed along to the trigger terminal on the starter solenoid.
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Figure 7.18
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