Work vehicle

1. A work vehicle comprising:

an engine;

a cooling core mounted in the work vehicle;

a fan configured to blow air to said cooling core and to make regular and reverse rotations;

a hydraulic drive unit configured to drive said fan by driving said engine; and

an idle reduction execution unit configured to stop said engine based on a state of rotation of said fan caused by said hydraulic drive unit and based on an idle state,

said idle reduction execution unit

stopping said engine on a condition that said fan makes regular rotation and said idle state has continued for a predetermined time, and

not stopping said engine on a condition that said fan makes reverse rotation.

2. The work vehicle according to claim 1 , further comprising:

a cab; and

a control panel provided in said cab and configured to receive an instruction given by an operator to make reverse rotation of said fan, wherein

said hydraulic drive unit drives said fan so that said fan makes reverse rotation, when said control panel receives said instruction to make reverse rotation of said fan.

3. The work vehicle according to claim 1 , wherein

said hydraulic drive unit includes:

a hydraulic motor configured to drive said fan;

a hydraulic pump configured to supply a hydraulic oil to said hydraulic motor by being driven by said engine;

a switch valve configured to switch a path through which said hydraulic oil is flown to said hydraulic motor; and

an adjustment unit configured to adjust a supply amount of the hydraulic oil supplied from said hydraulic pump to said hydraulic motor.

4. The work vehicle according to claim 3 , wherein

rotation speed of the regular and reverse rotations of said fan is adapted to be variable depending on the supply amount of said hydraulic oil supplied from said hydraulic pump to said hydraulic motor, and

said adjustment unit adjusts the supply amount of said hydraulic oil supplied from said hydraulic pump to said hydraulic motor so that the rotation speed of said fan is a maximum rotation speed in a case where said fan makes reverse rotation.

5. The work vehicle according to claim 1 , further comprising a detection unit configured to detect a state of operation of said work vehicle, wherein

said idle reduction execution unit

stops said engine on a condition that said detection unit detects that the state of operation of said work vehicle is a state where said work vehicle is not operated, said fan makes regular rotation, and said idle state has continued for a predetermined time, and

does not stop said engine on a condition that said fan makes reverse rotation.

6. The work vehicle according to claim 1 , further comprising a sensor configured to detect a temperature of a coolant of said engine or a temperature of a hydraulic oil, and

said idle reduction execution unit

stops said engine on a condition that the temperature of the coolant of said engine or the temperature of the hydraulic oil detected by said sensor is in a predetermined range, said fan makes regular rotation, and said idle state has continued for a predetermined time, and

does not stop said engine on a condition that said fan makes reverse rotation.

7. The work vehicle according to claim 1 , further comprising a cover arranged to cover said engine, said cooling core, and said fan, wherein

said cover includes a side cover capable of opening to expose a side of at least one of said engine, said cooling core, and said fan, when said fan makes reverse rotation.