取力器从汽车发动机获取动力，带动油泵旋转。

PTO get power from engine and drive oil pump rotation.

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释放方向盘，转向器中的旋转阀处于中位时，油泵和油箱之间是开环联接的。在。

Released the wheel of steering, pump and tank are connected in open circuit when the rotary.

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齿轮油泵在运转时主动齿轮带动被动齿轮旋转，当齿轮从啮合到脱开时在吸入侧(A)就形成局部真空，液体被吸入。

Gear pumps in operation when the passive gear driven rotary gear, when the gear was torn off from the mesh to the side when inhaled (a) on the formation of partial vacuum, the liquid to be inhaled.

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