4-40 4203780 First Edition
ELECTRICAL
4
Four Wheel Drive 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.
Accessory relay terminal 87 also provides switched
power to 10-amp circuit breaker (F6). Circuit breaker (F6)
provides voltage to 4WD switch and then to the diff lock
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.)
Four Wheel Drive Circuit
When the 4WD switch is placed in the on position,
voltage is provided to the reverse kick-out switch. When
the traction pedal is in the forward position, the reverse
kick-out switch is placed in the forward position, voltage is
provided to the 4WD solenoid, energizing the solenoid. If
the traction pedal is in the reverse position, the reverse
kick-out switch is placed in the reverse position, opening
the circuit to the 4WD solenoid.
Diff Lock Circuit
When the diff lock switch is in the on position, voltage is
provided to the diff lock solenoid, energizing the solenoid.
Four Wheel Drive Reverse Circuit
When the 4WD switch is held in the momentary on
position, voltage is provided to the 4WD and 4WD rev
solenoids, energizing the solenoids.
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