Craftsman 917.273521 Owner's Manual page 55

SUGGESTED GUIDE FOR SIGHTING SLOPES FOR SAFE OPERATION
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WARNING: To avoid serious injury, operate your tractor up and
down the face of slopes, never across the face, Do not mow
slopes greater than 15 degrees, Make turns gradually to prevent
tipping or loss of control, Exercise extreme caution when
changing direction on slopes.
1. Fold this page along doffed line indicated above.
2, Hold page before you so that its left edge is vertically parallel to a tree
trunk or other upright structure,
3. Sight across the fold in the direction of hill slope you want to measure,
4, Compare the angle of the fold with the slope of the hill,