液壓電機低速爬行的原因在于： (1)摩擦力的大小不穩定 通常的摩擦力是隨速度增大而增加的，而對靜止和低速區域工作的馬達內部的摩擦阻力，當工作速度增大時非但不增加，反而減少，形成了所謂“負特性”的阻力 另一方面，液壓馬達和負載是由液壓油被壓縮后壓力升高而被推動的，因此，可用圖4-1(a)所示的物理模型表示低速區域液壓馬達的工作過程：以勻速v0推彈簧的一端(相當于高壓下不可壓縮的工作介質) ，使質量為m的物體(相當于馬達和負載質量、轉動慣量)克服“負特性”的摩擦阻力而運動。
當物體靜止或速度很低時阻力大，彈簧不斷壓縮，增加推力 只有等到彈簧壓縮到其推力大于靜摩擦力時才開始運動一旦物體開始運動，阻力突然減小，物體突然加速躍動，其結果又使彈簧的壓縮量減少，推力減小，物體依靠慣性前移一段路程后停止下來，直到 彈簧的運動壓縮彈簧，增加推力，物體再次跳躍，形成如圖所示的時間停止狀態，這是液壓電機的爬行現象。
(2)泄漏量大小不穩定 液壓馬達的泄漏量并不總是一樣的，它也會隨著轉子旋轉的相位角度的變化而周期性地波動由于低速時進入馬達的流量小，泄漏所占的比重就增大，泄漏量的不穩定就會明顯地影響到參與馬達工作的流量數 值，從而造成轉速的波動。
當馬達在低速運轉時，其轉動部分及所帶的負載表現出的慣性較小，上述影響比較明顯，因而出現爬行現象 在實際工作中，最低穩定速度越小越好 7.液壓電機速度液壓電機的最高使用速度主要受使用壽命和機械效率的限制速度增加后，運動副磨損增加，使用壽命降低。
如果速度較高，液壓電機需要輸入的流量較大，因此流量相應增加 ，壓力損失也隨之增加，從而使機械效率降低 對某些液壓馬達，轉速的提高還受到背壓的限制例如，當曲軸連桿液體電機轉速增加時，必須顯著增加回油背壓，以確保連桿不會撞擊曲軸表面，從而避免沖擊現象。
隨著轉速的提高，回油腔所需的背部 壓值也應隨之提高但過度增加背壓會顯著降低液壓電機的效率為了使馬達的效率不致過低，馬達的轉速不應太高 8.液壓電機的調速范圍以最高使用速度與最低穩定速度之比表示 90-L-055-KP-1-NN-80-L-4-S1-C-03-GBA-32-32-24 90L055KP1NN80L4S1C03GBA323224 90-L-055-KP-1-NN-80-L-4-S1-D-03-EBC-29-29-24 90L055KP1NN80L4S1D03EBC292924 90-L-055-KP-1-NN-80-L-4-S1-D-03-GBA-26-26-24 90L055KP1NN80L4S1D03GBA262624 90-L-055-KP-1-NN-80-P-3-C6-C-03-EBC-29-29-24 90L055KP1NN80P3C6C03EBC292924 90-L-055-KP-1-NN-80-P-3-C6-C-03-GBA-32-32-24 90L055KP1NN80P3C6C03GBA323224 90-L-055-KP-1-NN-80-P-3-S1-C-03-GBA-14-35-24 90L055KP1NN80P3S1C03GBA143524 90-L-055-KP-1-NN-80-P-3-S1-C-03-GBA-20-20-24 90L055KP1NN80P3S1C03GBA202024 90-L-055-KP-1-NN-80-P-3-S1-C-03-GBA-26-26-20 90L055KP1NN80P3S1C03GBA262620 90-L-055-KP-1-NN-80-P-3-S1-C-03-GBA-26-26-24 90L055KP1NN80P3S1C03GBA262624 90-L-055-KP-1-NN-80-P-3-S1-C-03-GBA-32-32-24 90L055KP1NN80P3S1C03GBA323224 90-L-055-KP-1-NN-80-P-3-S1-C-03-GBA-35-35-24 90L055KP1NN80P3S1C03GBA353524 90-L-055-KP-1-NN-80-P-3-S1-C-03-GBA-42-42-24 90L055KP1NN80P3S1C03GBA424224 90-L-055-KP-1-NN-80-P-3-S1-D-03-GBA-29-29-24 90L055KP1NN80P3S1D03GBA292924 90-L-055-KP-1-NN-80-P-3-S1-D-03-GBA-35-35-24 90L055KP1NN80P3S1D03GBA353524 90-L-055-KP-1-NN-80-P-3-S1-D-03-GBA-42-42-24 90L055KP1NN80P3S1D03GBA424224 90-L-055-KP-1-NN-80-P-3-S1-D-09-GBA-35-35-24 90L055KP1NN80P3S1D09GBA353524 90-L-055-KP-1-NN-80-P-4-C6-C-03-GBA-35-35-24 90L055KP1NN80P4C6C03GBA353524 90-L-055-KP-1-NN-80-P-4-S1-C-03-GBA-26-26-20 90L055KP1NN80P4S1C03GBA262620 90-L-055-KP-1-NN-80-P-4-S1-C-03-GBA-35-35-20 90L055KP1NN80P4S1C03GBA353520 90-L-055-KP-1-NN-80-P-4-S1-C-03-GBA-35-35-24 90L055KP1NN80P4S1C03GBA353524 90-L-055-KP-1-NN-80-R-3-S1-C-03-GBA-35-35-20 90L055KP1NN80R3S1C03GBA353520 90-L-055-KP-1-NN-80-R-3-S1-C-03-GBA-40-40-28 90L055KP1NN80R3S1C03GBA404028 90-L-055-KP-1-NN-80-R-3-S1-C-03-GBA-42-42-24 90L055KP1NN80R3S1C03GBA424224 90-L-055-KP-1-NN-80-R-3-S1-C-05-GBA-35-35-24 90L055KP1NN80R3S1C05GBA353524 90-L-055-KP-1-NN-80-R-3-S1-D-03-GBA-29-29-24 90L055KP1NN80R3S1D03GBA292924 90-L-055-KP-1-NN-80-R-4-C6-C-03-GBA-35-35-24 90L055KP1NN80R4C6C03GBA353524 90-L-055-KP-1-NN-80-R-4-S1-C-03-EBC-35-35-24 90L055KP1NN80R4S1C03EBC353524 90-L-055-KP-1-NN-80-R-4-S1-C-03-GBA-17-17-24 90L055KP1NN80R4S1C03GBA171724 90-L-055-KP-1-NN-80-R-4-S1-C-03-GBA-20-20-24 90L055KP1NN80R4S1C03GBA202024 90-L-055-KP-1-NN-80-R-4-S1-C-03-GBA-35-35-20 90L055KP1NN80R4S1C03GBA353520 90-L-055-KP-1-NN-80-R-4-S1-C-03-GBA-35-35-24 90L055KP1NN80R4S1C03GBA353524 90-L-055-KP-1-NN-80-R-4-S1-C-03-GBA-38-38-24 90L055KP1NN80R4S1C03GBA383824 90-L-055-KP-1-NN-80-R-4-S1-D-03-GBA-26-26-24 90L055KP1NN80R4S1D03GBA262624 90-L-055-KP-1-NN-80-R-4-S1-D-03-GBA-35-35-24 90L055KP1NN80R4S1D03GBA353524 90-L-055-KP-1-NN-80-S-3-C6-C-02-GBA-35-35-24 90L055KP1NN80S3C6C02GBA353524 90-L-055-KP-1-NN-80-S-3-C6-C-03-GBA-32-32-24 90L055KP1NN80S3C6C03GBA323224 90-L-055-KP-1-NN-80-S-3-S1-B-00-GBA-20-20-24 90L055KP1NN80S3S1B00GBA202024 90-L-055-KP-1-NN-80-S-3-S1-C-00-GBA-29-29-20 90L055KP1NN80S3S1C00GBA292920 90-L-055-KP-1-NN-80-S-3-S1-C-00-GBA-32-32-20 90L055KP1NN80S3S1C00GBA323220 90-L-055-KP-1-NN-80-S-3-S1-C-00-GBA-35-35-24 90L055KP1NN80S3S1C00GBA353524 90-L-055-KP-1-NN-80-S-3-S1-C-02-GBA-35-35-24 90L055KP1NN80S3S1C02GBA353524 90-L-055-KP-1-NN-80-S-3-S1-C-02-GBA-42-42-24 90L055KP1NN80S3S1C02GBA424224 90-L-055-KP-1-NN-80-S-3-S1-C-03-GBA-32-23-24 90L055KP1NN80S3S1C03GBA322324 90-L-055-KP-1-NN-80-S-3-S1-C-03-GBA-32-32-24 90L055KP1NN80S3S1C03GBA323224 90-L-055-KP-1-NN-80-S-3-S1-C-03-GBA-35-35-24 90L055KP1NN80S3S1C03GBA353524 90-L-055-KP-1-NN-80-S-3-S1-C-03-GBA-42-42-24 90L055KP1NN80S3S1C03GBA424224 90-L-055-KP-1-NN-80-S-3-S1-D-02-GBA-26-26-24 90L055KP1NN80S3S1D02GBA262624 90-L-055-KP-1-NN-80-S-3-S1-D-03-GBA-35-35-28 90L055KP1NN80S3S1D03GBA353528 90-L-055-KP-1-NN-80-S-4-S1-C-03-GBA-26-26-24 90L055KP1NN80S4S1C03GBA262624 90-L-055-KP-1-NN-80-S-4-S1-C-03-GBA-42-14-24 90L055KP1NN80S4S1C03GBA421424 90-L-055-KP-1-NN-80-S-4-S1-C-03-GBA-42-42-24 90L055KP1NN80S4S1C03GBA424224 90-L-055-KP-1-NN-80-S-4-S1-C-05-GBA-32-32-24 90L055KP1NN80S4S1C05GBA323224 90-L-055-KP-1-NN-80-S-4-S1-D-02-GBA-26-26-24 90L055KP1NN80S4S1D02GBA262624 90-L-055-KP-1-NN-81-P-3-S1-C-03-GBA-35-35-20 90L055KP1NN81P3S1C03GBA353520 90-L-055-KP-1-NN-81-S-3-S1-C-03-GBA-29-29-20 90L055KP1NN81S3S1C03GBA292920 90-L-055-KP-2-CD-80-P-4-S1-C-00-GBA-35-35-24 90L055KP2CD80P4S1C00GBA353524 90-L-055-KP-2-NN-80-P-3-S1-C-03-GBA-23-23-24 90L055KP2NN80P3S1C03GBA232324 90-L-055-KP-2-NN-80-R-3-S1-C-03-GBA-35-35-24 90L055KP2NN80R3S1C03GBA353524 90-L-055-KP-5-BC-80-L-3-S1-D-03-GBA-29-29-24 90L055KP5BC80L3S1D03GBA292924 90-L-055-KP-5-CD-60-P-3-S1-D-03-GBA-45-45-24 90L055KP5CD60P3S1D03GBA454524 90-L-055-KP-5-CD-80-L-4-S1-D-03-GBA-35-35-24 90L055KP5CD80L4S1D03GBA353524 90-L-055-KP-5-CD-80-P-3-C6-C-00-GBA-32-32-24 90L055KP5CD80P3C6C00GBA323224 90-L-055-KP-5-CD-80-P-3-S1-C-00-GBA-32-32-24 90L055KP5CD80P3S1C00GBA323224 90-L-055-KP-5-CD-80-P-3-S1-C-03-GBA-38-38-20 90L055KP5CD80P3S1C03GBA383820 90-L-055-KP-5-CD-80-P-3-S1-C-03-GBA-38-38-24 90L055KP5CD80P3S1C03GBA383824 90-L-055-KP-5-CD-80-R-3-S1-C-03-GBA-20-20-20 90L055KP5CD80R3S1C03GBA202020 90-L-055-KP-5-CD-80-R-4-S1-C-03-GBA-29-29-24 90L055KP5CD80R4S1C03GBA292924 90-L-055-KP-5-CD-80-S-3-S1-C-03-GBA-29-29-20 90L055KP5CD80S3S1C03GBA292920 90-L-055-KP-5-CD-80-S-3-S1-D-03-GBA-42-42-24 90L055KP5CD80S3S1D03GBA424224 90-L-055-KP-5-CD-80-S-3-S1-D-03-GBA-45-45-24 90L055KP5CD80S3S1D03GBA454524 90L055-KP-5-CD-80-S-4-S1-C-03-GBA-29-29-20 90L055KP5CD80S4S1C03GBA292920 90-L-055-KP-5-CD-80-S-4-S1-C-03-GBA-29-29-20 90L055KP5CD80S4S1C03GBA292920 90-L-055-KP-5-NN-60-P-3-S1-D-03-GBA-45-45-24 90L055KP5NN60P3S1D03GBA454524 90-L-055-KP-5-NN-60-R-4-S1-C-03-GBA-29-29-20 90L055KP5NN60R4S1C03GBA292920 90-L-055-KP-5-NN-80-L-3-C6-D-00-GBA-38-32-24 90L055KP5NN80L3C6D00GBA383224 90-L-055-KP-5-NN-80-P-3-S1-C-00-GBA-32-32-24 90L055KP5NN80P3S1C00GBA323224 90-L-055-KP-5-NN-80-P-3-S1-C-03-GBA-38-38-20 90L055KP5NN80P3S1C03GBA383820 90-L-055-KP-5-NN-80-P-3-S1-C-03-GBA-38-38-24 90L055KP5NN80P3S1C03GBA383824 90-L-055-KP-5-NN-80-P-3-S1-C-03-GBA-40-40-24 90L055KP5NN80P3S1C03GBA404024 90-L-055-KP-5-NN-80-P-4-S1-C-03-GBA-29-29-24 90L055KP5NN80P4S1C03GBA292924 90-L-055-KP-5-NN-80-R-3-S1-C-03-GBA-20-20-20 90L055KP5NN80R3S1C03GBA202020 90-L-055-KP-5-NN-80-R-3-S1-C-03-GBA-35-35-24 90L055KP5NN80R3S1C03GBA353524 90-L-055-KP-5-NN-80-R-4-S1-C-03-GBA-20-20-24 90L055KP5NN80R4S1C03GBA202024 90-L-055-KP-5-NN-80-S-3-S1-C-03-GBA-29-29-20 90L055KP5NN80S3S1C03GBA292920 90-L-055-KP-5-NN-80-S-3-S1-D-03-GBA-42-42-24 90L055KP5NN80S3S1D03GBA424224 90-L-055-KP-5-NN-80-S-3-S1-D-03-GBA-45-45-24 90L055KP5NN80S3S1D03GBA454524。
