1、装载机举升缸活塞密封件早期磨损，将动臂举到最高位置，拆开其中一支举升缸活塞杆腔的进油接头，将工作分配阀的动臂操纵杆置于“举升”位置，并踩中高速油门，观察举升缸接口处的泄漏情况，正常略微有泄漏，判断另一只举升缸同理。
Shandong Loader lifting cylinder piston seals early wear and tear, the boom lift to the highest position, which open into the oil fitting a lifting cylinder rod chamber of the boom lever assignment valves placed in the "lift "position,and stepped on the accelerator speed, observe the lifting cylinder leakage at the interface, normal little leak, judge the other lifting cylinder empathy.

2、装载机工作泵效率降低，在排除第一项原因后，可基本判定工作泵效率降低。
Shandong loader working pump efficiency is reduced, the exclusion of the first cause, can substantially reduce the operating pump efficiency is determined.

3、装载机动臂举升速度主要决定于工作泵的转速、效率和举升油路的泄漏量，举升缸活塞密封件损坏或工作泵的效率下降，泄漏量会随之增大，且随工作压力的升高而增大，即物料越重举升越慢。
Shandong loader boom lift speed depends mainly on the work of the pump speed, efficiency and lift the oil leakage, the lifting cylinder piston seal is broken or decrease the efficiency of the work of the pump, the leakage will be increased, and with the work increased pressure increases, the material, the slower the heavier lifting.