?液壓馬達是由兩個活塞分別推動和控制的當活塞往復運動時，推動液體的往復運動，因此液體在活塞桿上的壓力可以傳遞，從而帶動液體流動，這就是馬達產生動力的原理當液壓油壓力超過額定值時，可以將油壓縮成油 壓或氣壓，使油在液體中以壓力形式流動.當液體壓力達到油壓時，油就變成液體通過管路輸送到壓力閥；液體被排出時，這時壓力油和液體中所含的壓力釋放，壓力液體即為油（或壓入介質）。
在制造液壓馬達的過程中，所有的零部件都是通過數控機床加工出來的因此可以使用更好的數控機床來進行加工制造例如，在制造過程中，會需要大量的機器零件，因此對于這些零件的維護是必不可少的而液壓馬達又 有著其獨特的優勢所在，對于這些零件來說，維護是非常簡單和容易的一件事情。
而且維護費用較低，所以它在機械制造業中非常受歡迎 體積小，重量輕，體積重量比同排量的齒輪泵要小，而且體積也小所以在應用中，很少需要大型的機械傳動裝置在沒有機械傳動裝置時，可由電動機驅動還可由一個工作單元驅動另一個工作單元。
因為油液在流動中是流動的，所以油耗量很小，節約了能源 驅動介質為液壓油，可以使用普通機械傳動的液壓泵，也可以使用具有多種驅動功能的液壓泵，但如果使用流量很大，并且要求嚴格控制流量的系統或負載時，可選用特殊液壓泵，如使用粘度較大，但流量一般較小的離心泵。
這種液壓泵一般不需要特殊設備，只是使用了一種驅動裝置，所以它也被稱為液壓泵這種泵主要有以下幾種類型:1、直接用油驅動2、采用特殊液壓油（或使用液壓油）或合成油驅動油（或電）由電機提供動力時，可用電動機直接帶動液壓泵進行工作。
油缸和機械傳動裝置用油進行潤滑加工后，在油與液介質的接觸面上形成油膜，密封或用活塞上蓋或氣隙，以防止油箱內產生真空或油液流出或油漏出（在工作時形成油路）由于油與液壓油組成了具有高粘度、高潤滑性、耐高溫和耐腐蝕性和抗老化能力強且潤滑效果好等優點的油液，所以在一般工作環境中使用較為廣泛。
但液壓油應具有抗氧化作用，耐腐蝕性也較強 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。
