Work principles of travel, braking, steering, lifting and swinging of mast, hoisting and cooling hydraulic circuits are all illustrated.

给出了行走、制动、转向、门架升降与摇摆、吊具，以及冷却液压回路的工作原理图。

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Failures which can be solved by minor adjustment on brake pump, wheel, steering hydraulic cylinder, and micro-valve, connect level, mast roller, steering axle, etc. are excluded.

像总泵、车轮、转向液压缸、微动阀、连杆、门架滚轮、转向桥等部位，只要靠紧固进行调整就能修理的故障。

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