4-36 4203780 First Edition
ELECTRICAL
4
Mow Circuit—Theory of Operation
Unswitched Power Circuit
Unswitched power is available from the battery positive
terminal to the starter motor battery terminal and then
from the starter motor battery terminal to 50-amp circuit
breaker (F1) battery terminal. Unswitched power is
available through the 50-amp circuit breaker (F1) to
30-amp circuit breaker (F2) input terminal and from
circuit breaker (F2) input terminal to 10-amp circuit
breaker (F5).
Unswitched power is available from 30-amp circuit
breaker (F2) output terminal to accessory relay terminal
30.
Unswitched power is provided from 10-amp circuit
breaker (F5) to PTO switch terminal E and then from
terminal E to time delay relay +12V terminal.
Switched Power Circuit
When the key switch is turned to the run position, voltage
is provided from key switch terminal I to accessory relay
terminal 86, energizing the relay. With the relay
energized, switched power is provided from accessory
relay terminal 87 to PTO switch terminal B and from
terminal B to the seat switch.
Interlock Circuit
The operator must be on the seat before releasing the
park brake or placing the PTO switch in the on position.
(See “Run Circuit—Theory of Operation” on page 4-30.)
Mow Circuit
When the PTO switch is placed in the on position, voltage
is provided to the following:
Front limit switch
• Right wing proximity switch
• Right wing relay terminal 30
• Left wing proximity switch
• Left wing relay terminal 30
When the right wing is lowered, the linkage is brought
near the magnetic target zone of the neutral proximity
switch, activating the switch. With the switch activated,
voltage is provided from the proximity switch to right wing
relay terminal 86, energizing the relay. With the relay
energized, voltage is provided to wing mow enable
switch. When the wing mow enable switch is placed in
the on position, voltage is provided to the right mow
solenoid, energizing the solenoid.
The left wing circuit operates the same as the right wing
circuit.
NOTE
The proximity switch is a solid state switch and will have
approximately a 2 to 3 volt drop across the switch when
activated.
When the front deck is lowered, the front limit switch is
turned to the on position. With the switch in the on
position, voltage is provided to the front mow enable
switch. When the front mow enable switch is placed in the
on position, voltage is provided to the front mow solenoid,
energizing the solenoid.
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