Patent ID: 7518322

Claim:
An operation circuit for a work vehicle, comprising: a switch device; an electromagnetic actuator driven in response to a command signal issued through the switch device; a work actuator driven by the electromagnetic actuator; at least one electric circuit module disposed between the switch device and the electromagnetic actuator, which controls driving the electromagnetic actuator in response to a command signal issued through the switch device; and a connector device that individually and detachably connects the switch device with the electric circuit module and the electric circuit module with the electromagnetic actuator, wherein: a mode in which the electromagnetic actuator is driven in response to the command signal from the switch device is modified (1) by replacing the electric circuit module with another electric circuit module via the connector device to change the operation circuit and alter the command signal or (2) by attaching another electric circuit module via the connector device to the electric circuit module to change the operation circuit and alter the command signal; and each electric circuit module includes a relay circuit.