Bench the boom against the swing limit and lock it to increase the excavator precision. If the boom is not locked, you can continue to work, but there can be a small drift in the X and Y directions.
Bench the boom against the swing limit to reset the swing boom sensor drift and it align it with the calibrated angles.
The low swing boom accuracy status message shows when the boom is not benched.

You must swing the boom to the extreme left or right position and use the Bench Against the Swing Limit shortcut button to bench it.


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Swing boom excavator interface
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