MTD 11A-549Q755 Operator's Manual page 7

Sight and hold this level with a vertical tree...
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or a corner of a building...
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15 °
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Usethis page as a guide to determine slopeswhere you may not operate safely.
WARNING: Do not operate your lawn mower on such slopes. Do not mow on inclines with a slope in excess of 15 degrees
(a rise of approximately 2-1/2 feet every 10 feet). A riding mower could overturn and cause serious injury. Operate riding
mowers up and down slopes, never across the face of slopes. Operate walk-behind mowers across the face of slopes, never
up and down slopes.