Crawler digging machine steering mechanism is how to achieve?

Crawler digging machine steering control:
The left-right steering control of the track-type digging machine excavator structure is realized by a turntable structure with a third deceleration motor installed between the crawler chassis and the digging machine structure.
Crawler digging machine steering fixed:
The crawler digging machine excavator structure is fixed on the turntable structure on the base: when the turntable turns to the left, the digging machine structure also turns to the left; when the turntable turns to the right, the digging machine structure also goes to the right Turn sideways.

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