齿轮马达概述：
(2)液压马达输出轴的转向必须能正转和反转，因此其结构呈对称性;而有的液压泵(如齿轮泵、叶片泵等)转向有明确的规定，只能单向转动，不能随意改变旋转方向。
(3)液压马达除了进、出油口外，还有单的泄漏油口;液压泵一般只有进、出油口(轴向柱塞泵除外)，其内泄漏油液与进油口相通。
(4)液压马达的容积效率比液压泵低。
(5)通常液压泵的工作转速都比较高，而液压马达输出转速较低。另外，齿轮泵的吸油口大，排油口小，而齿轮液压马达的吸、排油口大小相同。
掘进机齿轮泵：
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