?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(chǎn)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(shù)控機床加工出來的因此可以使用更好的數(shù)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(yōu)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(yè)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(jié)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(tǒng)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(chǎn)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(yōu)點的油液，所以在一般工作環(huán)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。
