1、升降货梯吸入量不足，其原因是吸油管路上的流量阻力过大或补油量不足．如泵的转向．油箱中液面过低，油温过箍，进油管漏气、滤油器堵塞等。
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、升降货梯http://m.iyunsun.com/液压泵泄漏量过大，其原因是间隙过大，密封不良造成。变量机构中单向阀密封面配合不好，泵体和配油盘的支承面有砂眼或裂痕等。这可以检查泵体内液压油中混杂的异物，未判断泵中被损坏的部位。故障的排除应根据不同的原因进行。如单向阀密封面重新研配、研磨配油盘及缸体端面、更换有砂眼或裂纹的零件。当柱塞与柱塞孔严重磨损或损坏，就应该将缸孔重新镀铜、研磨等加工修理。若变量机构的活塞磨损严重，可更换活塞，保证活塞与活塞孔间隙为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、升降货梯倾斜盘实际倾角太小，使泵的排量小，这需要控制操纵杆，增加斜盘倾角。
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、升降货梯http://m.iyunsun.com/压盘损坏。当柱塞泵处于自吸状态下工作时，压盘损坏，液压泵无法自吸，没有流量输出，应更换压盘。
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.