MTD 700 Series Professional Shop Manual page 116

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Series 700 Lawn Tractor
Reverse safety circuit
The reverse circuit functions the same for all of the electrical systems used on the 700 series tractors.
See Figure 7.26.
No OCR
• When the transmission put into reverse, the shift linkage will contact the reverse switch, applying a ground
to it.
• The ground signal will travel to a N.O terminal of the PTO switch through a yellow wire wit a black trace.
• If the PTO is ON, the contacts will close and sent the ground signal to the magneto through the yellow wire
and shut down the engine.
7 and 8 pin OCR
• When the transmission put into reverse, the shift linkage will contact the reverse switch, applying a ground
to it.
• The ground signal will travel to the REV SW terminal of the OCR module through a red wire with a a black
trace.
• If the module is in the mow in reverse mode, the reverse switch is "unplugged" and the signal stops there.
• If the module is not in the mow in reverse mode, the ground signal passes through the module to the PTO
switch through a yellow wire wit a black trace.
• If the PTO is ON, the contacts will close and sent the ground signal to the magneto through the yellow wire
and shut down the engine.
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Figure 7.26