@diano4ka,
Although there are no dataseries attached to a particular y-axis, the axis line will still be shown on the chart since its properties have been defined in the axisY/axisY2 array of objects. Removing these objects from axisY/axisY2 should work fine in your case.
Please check this updated JSFiddle for a working example.
—
Thangaraj Raman
Team CanvasJS