PROBLEM TO BE SOLVED: To enable an adhered dust removing function to be exerted at a suitable timing when it is required.SOLUTION: A work machine includes: a radiator 21 for cooling an engine a rotary fan 22 for ventilating cooling air through the radiator 21 a ventilation state switching mechanism 23 for switching a ventilation state of the rotary fan 22 between a normal flow state of sucking outside air via a dust removal tool 24 to ventilate a wind through the radiator 21 and a reverse flow state of ventilating a wind toward the dust removal tool 24 from the radiator 21 and a switching operation tool 41 capable of manually switching the ventilation state switching mechanism 23 between the normal flow state and the reverse flow state.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2016,JPO&INPIT【課題】必要な時に適切なタイミングで付着塵埃の除去機能を発揮することができるようにする。【解決手段】エンジン冷却用のラジエータ21と、ラジエータ21に冷却風を通風する回転ファン22と、除塵具24を介して外気を吸引してラジエータ21に風を通風する正流状態と、ラジエータ21から除塵具24に向けて風を通風する逆流状態とに回転ファン22の通風状態を切り換える通風状態切換機構23と、通風状態切換機構23を手動操作にて正流状態と逆流状態とに切り換え自在な切換操作具41とを備える。【選択図】図3
