Telescoping of the boom is carried out through telescoping cylinder and steel cable, and all booms telescope simultaneously.

吊臂的伸缩是通过伸缩油缸和钢丝绳进行，各伸缩臂同步伸缩。

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Model RT550 wheel type off-road crane; Load carry and travel; Boom telescoping with load; Lift operation;

RT550型越野轮胎起重机； 吊运行驶； 带载伸缩； 起重作业；

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Model RT550 wheel type off-road crane; Load carry and travel; Boom telescoping with load; Lift operation;

RT550型越野轮胎起重机； 吊运行驶； 带载伸缩； 起重作业；

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