齿轮泵：体积较小，结构较简单，对油的清洁度要求不严，价格较便宜；但泵轴受不平衡力，磨损严重，泄漏较大。
叶片泵:分为双作用叶片泵和单作用叶片泵。
这种泵流量均匀、运转平稳、噪音小、作压力和容积效率比齿轮泵高、结构比齿轮泵复杂。
柱塞泵:容积效率高、泄漏小、可在高压下工作、大多用於大功率液压系统;但结构复杂，材料和加工精度要求高、价格贵、对油的清洁度要求高。
一般在齿轮泵和叶片泵不能满足要求时才用柱塞泵。
还有一些其他形式的液压泵，如螺杆泵等，但应用不如上述3种普遍。
     液压泵主要有齿轮泵、叶片泵、柱塞泵等，下面以齿轮泵为例介绍故障及其诊断。
齿轮泵**常见的故障是泵体与齿轮的磨损、泵体的裂纹和机械损伤。
在机器运行过程中，齿轮泵常见的故障有：噪声严重及压动；输油量不足；液压泵不正常或有咬死现象。
 常规型号：德国力士乐柱塞泵A10VSO10排量：A10VSO10DR/52R-PPA12N00A10VSO10DR/52L-PKC64N00A10VSO10DR/52L-PPA14N00A10VSO10DR/52L-PUC64N00A10VSO10DR/52L-PUC64N00EA10VSO10DR/52R-PKC14N00A10VSO10DR/52R-PKC64N00A10VSO10DR/52R-PKC64N00EA10VSO10DR/52R-PKC64N00ESO857A10VSO10DR/52R-PKC64N00ESO858A10VSO10DR/52R-PKC64N00ESO938A10VSO10DR/52R-PKC64N00ESO938A10VSO10DR/52R-PKC64N00-SO857A10VSO10DR/52R-PKC64N00-SO858A10VSO10DR/52R-PKC64N00-SO938A10VSO10DR/52R-PPA14N00A10VSO10DR/52R-PPA14N00EA10VSO10DR/52R-PPA14N00-SO846A10VSO10DR/52R-PPA14N00-SO857A10VSO10DR/52R-PPA14N00-SO858A10VSO10DR/52R-PPA64N00A10VSO10DR/52R-PSA14N00A10VSO10DFR/52L-PKC64N00A10VSO10DFR/52L-PKC64N00EA10VSO10DFR/52L-PUC64N00A10VSO10DFR/52R-PKC14N00A10VSO10DFR/52R-PKC64N00A10VSO10DFR/52R-PKC64N00EA10VSO10DFR/52R-PKC64N00-S1645A10VSO10DFR/52R-PPA14N00A10VSO10DFR/52R-PPA14N00-SO858A10VSO10DFR/52R-PSA14N00-SO858A10VSO10DFR/52R-PSC64N00A10VSO10DFR/52R-PUC64N00A10VSO10DFR/52R-PUC64N00EA10VSO10DFR/52R-PUC64N00EA10VSO10DFR/52R-PUC64N00ESO857A10VSO10DFR/52R-PUC64N00-SO857A10VSO10DFR/52R-VUC14N00A10VSO10DFR/52R-VUC14N00-SO420A10VSO10DFR1/52L-PKC64N00A10VSO10DFR1/52L-PPA14N00A10VSO10DFR1/52L-PSC14N00A10VSO10DFR1/52L-PSC64N00A10VSO10DFR1/52L-PUC64N00A10VSO10DFR1/52R-PKC64N00A10VSO10DFR1/52R-PKC64N00EA10VSO10DFR1/52R-PKC64N00EA10VSO10DFR1/52R-PKC64N00-SO857A10VSO10DFR1/52R-PKC64N00-SO858A10VSO10DFR1/52R-PPA14N00A10VSO10DFR1/52R-PPA14N00-S1482A10VSO10DFR1/52R-PPA14N00-SO857A10VSO10DFR1/52R-PPA14N00-SO858A10VSO10DFR1/52R-PSA14N00-S1915A10VSO10DFR1/52R-PSA14N00-SO32A10VSO10DFR1/52R-PSC14N00A10VSO10DFR1/52R-PSC14N00-SO32A10VSO10DFR1/52R-PSC64N00A10VSO10DFR1/52R-PSC64N00EA10VSO10DFR1/52R-PSC64N00ES1768A10VSO10DFR1/52R-PSC64N00-S1768A10VSO10DFR1/52R-PUC64N00A10VSO10DFR1/52R-PUC64N00EA10VSO10DFR1/52R-PUC64N00EA10VSO10DFR1/52R-PUC64N00-SO857A10VSO10DFR1/52R-VPA14N00A10VSO10DFR1/52R-VUC64N00A10VSO10DR/52R-PSA14N00-S1482A10VSO10DR/52R-PSA14N00-SO32A10VSO10DR/52R-PSA14N00-SO857A10VSO10DR/52R-PSC64N00A10VSO10DR/52R-PSC64N00EA10VSO10DR/52R-PSC64N00-SO858A10VSO10DR/52R-PSC64N00-SO922A10VSO10DR/52R-PUC14N00A10VSO10DR/52R-PUC14N00A10VSO10DR/52R-PUC64N00A10VSO10DR/52R-PUC64N00EA10VSO10DR/52R-PUC64N00-S1768A10VSO10DR/52R-PUC64N00-SO857A10VSO10DR/52R-PUC64N00-SO858A10VSO10DR/52R-VKC64N00ES1768A10VSO10DR/52R-VKC64N00-S1768A10VSO10DR/52R-VPA14N00A10VSO10DR/52R-VPA14N00-SO857A10VSO10DR/52R-VSC64N00-SO857A10VSO10DRG/52L-PSC64N00A10VSO10DRG/52L-PUC64N00A10VSO10DRG/52R-PKC14N00A10VSO10DRG/52R-PKC64N00A10VSO10DRG/52R-PKC64N00EA10VSO10DRG/52R-PKC64N00-SO846A10VSO10DRG/52R-PKC64N00-SO857A10VSO10DRG/52R-PKC64N00-SO858A10VSO10DRG/52R-PPA14N00A10VSO10DRG/52R-PPA14N00-SO857A10VSO10DRG/52R-PPA14N00-SO858A10VSO10DRG/52R-PPC14N00A10VSO10DRG/52R-PSC14N00A10VSO10DRG/52R-PSC14N00-SO857A10VSO10DRG/52R-PSC64N00A10VSO10DRG/52R-PUC14N00A10VSO10DRG/52R-PUC64N00A10VSO10DRG/52R-PUC64N00-SO857A10VSO18排量：A10VSO18DR/31R-PPA12N00A10VSO18DR/31R-PPA12K01A10VSO18DFR1/31R-PPA12N00A10VSO18DFR1/31R-PPA12N00A10VSO18DFR1/31R-PPA12K01A10VSO18DFR/31R-PPA12N00A10VSO18DFLR/31R-PPA12N00A10VSO18DG/31R-PPA12N00A10VSO18DRG/31R-PPA12N00A10VSO18DFE1/31R-PPA12N00A10VSO18FHD/31R-PPA12N00A10VSO18ED/31R-PPA12N00德国力士乐柱塞泵A10VSO28排量：A10VSO28DR/31R-PPA12N00A10VSO28DR/31R-PPA12K01A10VSO28DFR1/31R-PPA12N00A10VSO28DFR1/31R-PPA12N00A10VSO28DFR1/31R-PPA12K01A10VSO28DFR/31R-PPA12N00A10VSO28DFLR/31R-PPA12N00A10VSO28DG/31R-PPA12N00A10VSO28DRG/31R-PPA12N00A10VSO28DFE1/31R-PPA12N00A10VSO28FHD/31R-PPA12N00A10VSO28ED/31R-PPA12N00德国力士乐柱塞泵A10VSO45排量：A10VSO45DR/31R-PPA12N00A10VSO45DR/31R-PPA12K01A10VSO45DFR1/31R-PPA12N00A10VSO45DFR1/31R-PPA12N00A10VSO45DFR1/31R-PPA12K02A10VSO45DFR/31R-PPA12N00A10VSO45DFR/31R-PPA12K01A10VSO45DFR/31R-PPA12K26A10VSO45DFLR/31R-PPA12N00A10VSO45DG/31R-PPA12N00A10VSO45DRG/31R-PPA12N00A10VSO45DFE1/31R-PPA12N00A10VSO45FHD/31R-PPA12N00A10VSO45ED/31R-PPA12N00德国力士乐柱塞泵A10VSO71排量：A10VSO71DR/31R-PPA12N00A10VSO71DR/31R-PPA12K01A10VSO71DFR1/31R-PPA12N00A10VSO71DFR1/31R-PPA12N00A10VSO71DFR1/31R-PPA12K02A10VSO71DFR/31R-PPA12N00A10VSO71DFR/31R-PPA12K27A10VSO71DFLR/31R-PPA12N00A10VSO71DG/31R-PPA12N00A10VSO71DRG/31R-PPA12N00A10VSO71DFE1/31R-PPA12N00A10VSO71FHD/31R-PPA12N00A10VSO71ED/31R-PPA12N00德国力士乐柱塞泵A10VSO100排量：A10VSO100DR/31R-PPA12N00A10VSO100DR/31R-PPA12K01A10VSO100DFR1/31R-PPA12N00A10VSO100DFR1/31R-PPA12N00A10VSO100DFR1/31R-PPA12K01A10VSO100DFR/31R-PPA12N00A10VSO100DFLR/31R-PPA12N00A10VSO100DG/31R-PPA12N00A10VSO100DRG/31R-PPA12N00A10VSO100DFE1/A10VSO100DFE1A10VSO100DFE1/31R-PPA12K02A10VSO100FHD/31R-PPA12N00德国力士乐柱塞泵A10VSO140排量：A10VSO140DR/31R-PPB12N00A10VSO140DR/31R-PPB12K01A10VSO140DFR1/31R-PPB12N00A10VSO140DFR1/31R-PPB12N00A10VSO140DFR1/31R-PPB12K01A10VSO140DFR/31R-PPB12N00A10VSO140DFLR/31R-PPB12N00A10VSO140DG/31R-PPB12N00A10VSO140DRG/31R-PPB12N00A10VSO140DFE1/31R-PPB12N00A10VSO140DFE1/31R-PPB12N002A10VSO140FHD/31R-PPB12N00A10VSO140ED/31R-PPB12N00以上为德国力士乐A10VSO型号(31和52系列)无通轴型柱塞泵10、18、28、45、71、100、140各排量常规型号。
   武汉星兴达液压气动设备有限公司专业生产液压站、液压油缸、轴向柱塞泵、叶片油泵、齿轮油泵、液压马达、液压阀、液压元件、气动阀、气缸、气动三联件、气动元件.本公司1992成立以后，以设计、生产、代理、经营气动元件、液压元件、液压设备等为主导产品的股份制造企业，也是华中地区同行业通过ISO9001：本公司产品质量管理体系一次性复审合格的企业，具有很强的产品设计、开发和生产能力。
近几年来，通过引进国内外*的生产加工技术、消化和改进，使本公司的产品在不断更新换代。
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