Series 700 Lawn Tractor
94
OCR Module
The OCR Module is in the same housing as the key
switch, and is not available separately. For the purpose of
diagnosis, it is treated separately. Diagnosis of the module
with the key switch introduces too many over-lapping vari
-
ables. See Figure 7.5.
NOTE: The function and testing procedures are the
same for the 7 and the 8-pin modules.
Principle: To diagnose the module, the simplest
approach is to check all of the inputs (safety
circuits) that are connected to it. If the inputs
work properly, but the OCR module does not
work properly (outputs), then the module can
be determined to be faulty. A specific proce
-
dure is covered, following the description of the
correct operation of the OCR module.
Working properly: The module cannot be diag-
nosed if its function is not understood. It is
designed to work as follows:
See Figure 7.6.
When the OCR module is disarmed, the mower
will operate as MTD mowers have historically
operated:
• If reverse is engaged when the PTO is ON,
the engine will turn off.
• If the operator leaves the seat with the engine
running, the engine will turn off.
• If the operator leaves the seat with the PTO
in the OFF position, the engine will turn off
unless the parking brake is applied.
• When the OCR module is armed, the mower
will operate identically to when the module is
disarmed.
• When the OCR module is armed and turned
on: The mower will operate identically to when
the module is disarmed, except that the opera-
tor will be able to put the transmission in
reverse with the PTO engaged and the engine will continue to run. The operator may put the mower into
and out of reverse as many times as they wish without having to re-arm or turn on the module again.
Figure 7.5
OCR Module
LED Indicator
FOR DISCOUNT PARTS CALL 606-678-9623 OR 606-561-4983
www.mymowerparts.com
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