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700 SERIES LAWN TRACTORS
17.26. The Brake Switch is mounted to the left frame
channel, just beneath the running board and
immediately behind the clutch / brake pedal.
See Figure 17.26.
Figure 17.26
•
The plunger on the switch is depressed when
the clutch / brake pedal is pressed-down, de-
clutching the drive belt and applying the brakes.
The switch contains two sets of contacts.
•
A normally open (NO) set of contacts is in the
starter inhibit circuit. When the clutch / brake
pedal is depressed, the contacts are closed,
power coming from the key switch (key switch in
START) through the orange wire is passed on to
the PTO switch through the orange wire with
black trace.
•
A normally closed (NC) set of contacts is in the
safety shut-down circuit. A circuit is completed
from the M terminal on the key switch, and
directly from the magneto primary windings
through the pair of yellow wires to the clutch /
brake switch through to the yellow wire with
black trace when the contacts are closed.
•
The yellow wire with black trace leads to one
element of the seat switch. If the seat is vacant
and the pedal is up, the engine will turn-off.
Brake switch
(brake ON)
17.27. The Park Brake Switch is riveted inside the left
front edge of the dash panel. See Figure 17.27.
•
The switch contains two sets of contacts, one set
normally open (NO), and one set normally
closed (NC). Only the normally open set is used
in this application.
•
The switch plunger is extended (contacts open)
when the parking brake is released: "RUN" posi-
tion on the label.
•
The plunger is depressed (contacts closed)
when the parking brake is applied: "ON" position
on the label.
•
To insure that the correct spade terminals on the
switch are tested, it may be best to identify the
yellow wire with white trace and the green wire
that connect to the switch where they enter the
connector for the RMC module, and test from
that point.
•
When the park brake is set, this switch sends a
ground signal to the RMC module. The module
responds by turning-off and disarming itself.
NOTE: Once the operator has set the parking
brake, they may leave the seat of the tractor
while the engine continues to run. Because the
tractor cannot tell if the same operator has
returned to the seat when operation resumes,
the module must be re-set (armed) and turned-
on by the operator who is currently in the seat.
NOTE: The electric PTO clutch system found on
some 600 and 800 series tractors does not use a
park brake switch. The electric PTO version dis-
arms whenever the seat becomes vacant.
38
Park
brake
switch
Figure 17.27
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