Start Circuit - Cub Cadet 2000 Series Professional Shop Manual

Start Circuit

Figure 7.16
3a. If the PTO switch is on, the N.C. terminal on the A set of contacts will not connect to anything. The sys-
tem monitor will measure open circuit voltage, illuminating the PTO symbol.
3b. If the PTO switch is off, the N.C. terminal on the A set of contacts will be connected to the COM terminal
on the A set of contacts. Power will be passed along to the trigger terminal on the starter solenoid.
4. When the following conditions are met:
• Key to START
• Brake pedal is depressed
• PTO off
The starter solenoid trigger terminal will receive power (orange wire).
5. When the starter solenoid trigger terminal receives power two things happen; first a set of contacts have to
close inside the solenoid allowing the power to pass through to the starter motor. The second thing that hap-
pens is that the solenoid pushes the bendix gear out so that it may engage the ring gear of the flywheel.
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 7.16.
1. When the key switch is in the START position, battery
power is passed from the B terminal to the S termi-
nal.
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. The system
monitor will measure open circuit voltage, illumi-
nating the brake symbol.
2b. If the brake is depressed, 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 park brake is set,
power will continue to the A-N.C. terminal of the PTO
switch (orange/black trace).
Electrical System
103