Work machine

A work machine comprising:

• an engine;
• a hydraulic motor having a primary side and a secondary side;
• a cooling fan to be revolved by the hydraulic motor;
• a hydraulic pump to be driven by the engine to supply an operation fluid to the primary side of the hydraulic motor;
• a bypass circuit to connect the primary side and the secondary side of the hydraulic motor;
• an electromagnetic valve disposed in the bypass circuit, the electromagnetic valve being configured to control a flowing amount of the operation fluid in the bypass circuit to control an amount of the operation fluid supplied to the primary side of the hydraulic motor;
• a first fluid tube to connect the primary side of the hydraulic motor and the hydraulic pump;
• a second fluid tube branched from the first fluid tube;
• a hydraulic actuator to receive the operation fluid from the second fluid tube;
• a control valve connected to the second fluid tube to supply the operation fluid to the hydraulic actuator;
• and
• a controller to control the electromagnetic valve to increase a revolution speed of the hydraulic motor when the hydraulic actuator is in operation.