ELECTRICAL SYSTEM
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
6-M4
[3] OPERATOR PRESENCE CONTROL (OPC)
The BX Tractor equips operator presence control (OPC) system which automatically stops the engine when
operator stands up from the operator's seat while shifting the PTO lever or the speed control pedal.
Tractor without the OPC timer stops quickly and tractor with the OPC timer stops in approximately one second
when standing up from the seat.
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Electrical Circuit (Tractor with OPC Timer)
General electrical circuit of the tractor OPC timer is
shown in the figure.
1. When sitting on the operator's seat in the state of the
main switch "ON", the battery voltage passes to the
seat switch and the OPC timer (4), and keep the
solenoid relay (8).
2. When standing up from the operator's seat, the
circuit from the seat switch to the OPC timer is cut.
However, if the PTO lever (or the speed control
pedal) are set at "Neutral" position, the circuit from
the battery to the solenoid relay (8) is formed with the
PTO switch (or HST switch).
3. When standing up from the operator's seat while
shifting the levers, the circuit from the battery to the
solenoid relay (8) is cut, and the engine is stopped by
function of the solenoid (9).
Seat Switch
The seat switch has two positions.
When the operator's seat is occupied, the switch
contact point is at "ON" position. When the operator's
seat is not occupied, its contact point is at "OFF"
position.
OPC Timer
OPC timer is located electrically at between the seat
switch (5) and the solenoid relay (8).
When the current supply from the seat switch (5) is
cut, the OPC timer (4) adopted for the OPC system has
kept the state of "ON" position for approximately one
second.
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(1) Slow Blow Fuse
(2) Main Switch
(3) Fuse (10 A)
(4) OPC Timer
(5) Seat Switch (From Seat
Switch ON or OFF)
(6) Fuse (15 A)
(7) Battery
(8) Engine Stop Solenoid Timer
Relay
(9) Engine Stop Solenoid
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