1、升降貨梯吸入量不足，其原因是吸油管路上的流量阻力過大或補油量不足．如泵的轉向．油箱中液面過低，油溫過箍，進油管漏氣、濾油器堵塞等。
Inadequate cargo lifter suction rate, the reason is the flow resistance of the suction piping is too large or fill fuel shortage. Such as the steering pump. Tank level is too low, oil over hoop, into the pipeline leak, oil filter blockage.

2、升降貨梯http://www.fnae.cn/液壓泵泄漏量過大，其原因是間隙過大，密封不良造成。變量機構中單向閥密封面配合不好，泵體和配油盤的支承面有砂眼或裂痕等。這可以檢查泵體內液壓油中混雜的異物，未判斷泵中被損壞的部位。故障的排除應根據不同的原因進行。如單向閥密封面重新研配、研磨配油盤及缸體端面、更換有砂眼或裂紋的零件。當柱塞與柱塞孔嚴重磨損或損壞，就應該將缸孔重新鍍銅、研磨等加工修理。若變量機構的活塞磨損嚴重，可更換活塞，保證活塞與活塞孔間隙為0.02毫米。

Cargo lifter pump excessive leakage, the reason is the gap is too large, resulting in poor seal. Variable institutions with the bad check valve sealing surface, the bearing surface of the pump and oil pan with trachoma or cracks and the like. It can check the hydraulic oil in the pump body mixed foreign matter, did not determine the damaged parts of the pump. Troubleshooting should be based on different reasons. Check valve sealing surface spotting again, grinding oil pan and cylinder end face,replacement parts trachoma or cracks. When the plunger and the plunger hole badly worn or damaged, it should be re-bore copper plating, grinding and other processing repair. If the piston variable displacement mechanism severe wear, replace the piston, piston and piston bore to ensure that the gap is 0.02 mm.

3、升降貨梯傾斜盤實際傾角太小，使泵的排量小，這需要控制操縱桿，增加斜盤傾角。
Cargo lifter actual tilt angle of the disk is too small, so that the pump displacement is small, it is necessary to control the joystick, increase swash plate.

4、升降貨梯http://www.fnae.cn/壓盤損壞。當柱塞泵處于自吸狀態下工作時，壓盤損壞，液壓泵無法自吸，沒有流量輸出，應更換壓盤。
Cargo lifter platen damage. When the piston is in the state of self-priming operation, the pressure plate is damaged, can not be self-priming pump, no flow output, replace the pressure plate.