液压马达是由两个活塞分别推动和控制的当活塞往复运动时，推动液体的往复运动，因此液体在活塞杆上的压力可以传递，从而带动液体流动，这就是马达产生动力的原理当液压油压力超过额定值时，可以将油压缩成油 压或气压，使油在液体中以压力形式流动.当液体压力达到油压时，油就变成液体通过管路输送到压力阀；液体被排出时，这时压力油和液体中所含的压力释放，压力液体即为油（或压入介质）。
在制造液压马达的过程中，所有的零部件都是通过数控机床加工出来的因此可以使用更好的数控机床来进行加工制造例如，在制造过程中，会需要大量的机器零件，因此对于这些零件的维护是必不可少的而液压马达又 有着其独特的优势所在，对于这些零件来说，维护是非常简单和容易的一件事情。
而且维护费用较低，所以它在机械制造业中非常受欢迎 体积小，重量轻，体积重量比同排量的齿轮泵要小，而且体积也小所以在应用中，很少需要大型的机械传动装置在没有机械传动装置时，可由电动机驱动还可由一个工作单元驱动另一个工作单元。
因为油液在流动中是流动的，所以油耗量很小，节约了能源 驱动介质为液压油，可以使用普通机械传动的液压泵，也可以使用具有多种驱动功能的液压泵，但如果使用流量很大，并且要求严格控制流量的系统或负载时，可选用特殊液压泵，如使用粘度较大，但流量一般较小的离心泵。
这种液压泵一般不需要特殊设备，只是使用了一种驱动装置，所以它也被称为液压泵这种泵主要有以下几种类型:1、直接用油驱动2、采用特殊液压油（或使用液压油）或合成油驱动油（或电）由电机提供动力时，可用电动机直接带动液压泵进行工作。
油缸和机械传动装置用油进行润滑加工后，在油与液介质的接触面上形成油膜，密封或用活塞上盖或气隙，以防止油箱内产生真空或油液流出或油漏出（在工作时形成油路）由于油与液压油组成了具有高粘度、高润滑性、耐高温和耐腐蚀性和抗老化能力强且润滑效果好等优点的油液，所以在一般工作环境中使用较为广泛。
但液压油应具有抗氧化作用，耐腐蚀性也较强 90-R-055-KA-1-CD-80-P-4-S1-C-03-GBA-14-14-24 90R055KA1CD80P4S1C03GBA141424 90-R-055-KA-1-CD-80-P-4-S1-C-03-GBA-29-29-24 90R055KA1CD80P4S1C03GBA292924 90-R-055-KA-1-CD-80-R-3-S1-C-03-GBA-23-23-20 90R055KA1CD80R3S1C03GBA232320 90-R-055-KA-1-CD-80-R-3-S1-C-03-GBA-23-23-24 90R055KA1CD80R3S1C03GBA232324 90-R-055-KA-1-CD-80-R-4-S1-C-03-GBA-26-26-24 90R055KA1CD80R4S1C03GBA262624 90-R-055-KA-1-CD-80-S-3-S1-D-03-GBA-29-29-24 90R055KA1CD80S3S1D03GBA292924 90-R-055-KA-1-CD-80-S-4-S1-C-00-GBA-35-35-24 90R055KA1CD80S4S1C00GBA353524 90-R-055-KA-1-CD-80-S-4-S1-C-02-GBA-26-26-24 90R055KA1CD80S4S1C02GBA262624 90-R-055-KA-1-NN-60-L-3-S1-C-03-EBC-35-35-20 90R055KA1NN60L3S1C03EBC353520 90-R-055-KA-1-NN-60-L-3-S1-C-03-GBA-23-23-24 90R055KA1NN60L3S1C03GBA232324 90-R-055-KA-1-NN-60-L-3-S1-C-03-GBA-35-35-20 90R055KA1NN60L3S1C03GBA353520 90-R-055-KA-1-NN-60-L-3-S1-C-03-GBA-35-35-24 90R055KA1NN60L3S1C03GBA353524 90-R-055-KA-1-NN-60-L-4-S1-C-03-GBA-20-20-24 90R055KA1NN60L4S1C03GBA202024 90-R-055-KA-1-NN-60-P-3-S1-C-03-GBA-14-14-24 90R055KA1NN60P3S1C03GBA141424 90-R-055-KA-1-NN-60-P-3-S1-C-03-GBA-35-35-24 90R055KA1NN60P3S1C03GBA353524 90-R-055-KA-1-NN-60-P-3-T1-C-03-EBC-26-26-24 90R055KA1NN60P3T1C03EBC262624 90-R-055-KA-1-NN-60-P-3-T1-C-03-EBC-38-14-24 90R055KA1NN60P3T1C03EBC381424 90-R-055-KA-1-NN-60-P-4-S1-C-03-GBA-23-23-24 90R055KA1NN60P4S1C03GBA232324 90-R-055-KA-1-NN-60-P-4-S1-C-03-GBA-35-35-20 90R055KA1NN60P4S1C03GBA353520 90-R-055-KA-1-NN-60-P-4-S1-C-03-GBA-35-35-24 90R055KA1NN60P4S1C03GBA353524 90-R-055-KA-1-NN-60-R-3-S1-C-03-EBC-38-14-24 90R055KA1NN60R3S1C03EBC381424 90-R-055-KA-1-NN-60-R-4-S1-D-03-GBA-35-35-24 90R055KA1NN60R4S1D03GBA353524 90-R-055-KA-1-NN-60-S-3-C6-C-03-GBA-35-35-24 90R055KA1NN60S3C6C03GBA353524 90-R-055-KA-1-NN-60-S-3-C6-C-03-GBA-38-38-24 90R055KA1NN60S3C6C03GBA383824 90R055-KA-1-NN-60-S-3-C6-C-04-GBA-32-32-24 90R055KA1NN60S3C6C04GBA323224 90-R-055-KA-1-NN-60-S-3-C6-C-04-GBA-32-32-24 90R055KA1NN60S3C6C04GBA323224 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90-R-055-KA-2-NN-80-P-3-S1-C-03-GBA-35-35-24 90R055KA2NN80P3S1C03GBA353524 90-R-055-KA-2-NN-80-R-4-S1-C-03-GBA-26-26-28 90R055KA2NN80R4S1C03GBA262628 90-R-055-KA-2-NN-80-S-3-C6-C-03-GBA-42-42-24 90R055KA2NN80S3C6C03GBA424224 90-R-055-KA-2-NN-80-S-4-C6-C-03-GBA-42-42-24 90R055KA2NN80S4C6C03GBA424224 90-R-055-KA-5-AB-60-L-3-C6-C-03-GBA-35-35-24 90R055KA5AB60L3C6C03GBA353524 90R055-KA-5-AB-60-L-3-S1-D-03-GBA-35-35-24 90R055KA5AB60L3S1D03GBA353524 90-R-055-KA-5-AB-60-L-3-S1-D-03-GBA-35-35-24 90R055KA5AB60L3S1D03GBA353524 90-R-055-KA-5-AB-60-P-3-C6-C-03-GBA-35-35-28 90R055KA5AB60P3C6C03GBA353528 90-R-055-KA-5-AB-60-P-3-S1-C-03-EBC-23-23-24 90R055KA5AB60P3S1C03EBC232324 90R055-KA-5-AB-60-P-3-S1-C-03-GBA-35-35-24 90R055KA5AB60P3S1C03GBA353524 90-R-055-KA-5-AB-60-P-3-S1-C-03-GBA-35-35-24 90R055KA5AB60P3S1C03GBA353524 90-R-055-KA-5-AB-60-P-4-C6-C-03-GBA-35-35-28 90R055KA5AB60P4C6C03GBA353528。
