KB21 Service Manual Pub 09-14
65
40-B. Bucher L.8S - Electric Control/Cable
Hydraulic Functions
The hydraulic functions of the boom mower are controlled by an electrically actuated control valve.
General Operation
This Section addresses the method of operation of the electrical part of controls. The function of the
hydraulic valve itself will be covered in another section.The four functions: (Swing, Lift, Dipper, and
tilt) are “On” or “Off” only, meaning that their speed of operation is dependent upon the volume of oil
In our application the oil volume varies with the tractor engine speed.
The electrical power to operate the circuits is obtained from a switched and fused tractor voltage
source. This means that the electrical power wire to the joystick controller should only be connected to
a wire that has voltage when the ignition is in the “ON” position.
If connection of the joystick controller is to a constant current source it will cause power drain on battery
and eventually battery failure. Furthermore the master switch on the joystick console must be in the
“ON” position to allow for the operation of any of the control functions.
The signal from the joystick is converted by the electronic controller into hydraulic
pressure by activating a series of hydraulic valves. These valves direct the standby or pilot pressure oil
to the proper end of the spool to cause it to move.
owing through the circuit and cannot be controlled by the joystick position.
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