Retrocedes according to the geography situation advance and promotes the big arm, the movement to be nimble, in the hopper like has the large stone, the mud and so on certainly to clean up.

根据地理情况前进后退与提升大臂，动作要灵活，料斗内如有大块石头、泥巴等一定要清理。

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Excluded methods: to hopper inside the 15 ~ 30l of water poured into the mud again and again is, reverse to start pumps, forcing the channel to open.

排除方法：往料斗内倒入15 ~ 30l水泥浆，反复正、反向启动泵，迫使通路打开。

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