Tractor

A tractor comprising:

• a vehicle body frame;
• a three-point linkage connected to a back portion of a vehicle body of the tractor to be swingable upward and downward and allowing attachment of an implement;
• a lifting and lowering driver to lift and lower the three-point linkage;
• a load detector to swing according to a traction load of the implement during ground work performed by the implement while the implement is towed by the vehicle body;
• a mechanical linkage to transmit a swing amount of the load detector to the lifting and lowering driver;
• a transmission case in a back portion of the vehicle body frame;
• and
• a power takeoff (PTO) shaft protruding backward from a back portion of the transmission case to output power to be transmitted to the implement;
• the mechanical linkage including an operation cable operable according to the swing amount of the load detector;
• the operation cable extending downward from a first position higher than the PTO shaft to a second position higher than the PTO shaft passing through under the PTO shaft, wherein the operation cable transmits the swing amount of the load detector to the lifting and lowering driver during the ground work performed by the implement while the implement is towed by the vehicle body.

A tractor comprising:

• a three-point linkage connected to a back portion of a vehicle body of the tractor to be swingable upward and downward and allowing attachment of an implement;
• a lifting and lowering driver to lift and lower the three-point linkage;
• a load detector to swing according to a traction load of the implement during ground work performed by the implement while the implement towed by the vehicle body;
• and
• a mechanical linkage to transmit a swing amount of the load detector to the lifting and lowering driver;
• the mechanical linkage including an operation cable operable according to the swing amount of the load detector;
• the operation cable being provided such that an upstream end on a side of the load detector in the operation cable and a lower downstream end on a side of the lifting and lowering driver in the operation cable extend along an upward-downward direction and the downstream end is positioned ahead of the upstream end, wherein the operation cable transmits the swing amount of the load detector to the lifting and lowering driver during the ground work performed by the implement while the implement is towed by the vehicle body.

A tractor comprising:

• a three-point linkage connected to a back portion of a vehicle body of the tractor to be swingable upward and downward and allowing attachment of an implement;
• a lift arm to lift and lower the three-point linkage;
• a lifting and lowering driver to lift and lower the lift arm;
• a load detector to swing according to a traction load of the implement during ground work performed by the implement while the implement is towed by the vehicle body;
• and
• a mechanical linkage to transmit a swing amount of the load detector to the lifting and lowering driver;
• the lifting and lowering driver including:
• an actuator;
• and
• a controller configured or programmed to control an actuation of the actuator;
• the mechanical linkage including an operation linkage to operate the controller in response to a swing amount of the load detector, and an operation cable operable according to the swing amount of the load detector;
• the operation linkage extending through a position lateral to the lift arm, wherein the operation cable transmits the swing amount of the load detector to the lifting and lowering driver during the ground work performed by the implement while the implement is towed by the vehicle body.