... 转向回路工作：steering circuit operation 转向回路存在问题：steering circuit problem 转向回路安全阀：steering circuit relief valve ...
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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。
Work principles of travel, braking, steering, lifting and swinging of mast, hoisting and cooling hydraulic circuits are all illustrated.
根据液压转向助力器的结构和转向系统的工作原理，介绍了一种转向助力器检测回路的设计和测试原理。
According to the structure of hydraulic steering boosters and the work principle of steering system, design of the test circuit and test principle for a steering booster are introduced in the article.
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