Troy-Bilt 979 Operator's Manual page 6

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SIGHT AND HOLD THIS LEVEL WITH A VERTICAL TREE
,_ WARNING
A POWER POLE
A CORNER OF A BUILDING
OR A FENCE POST
Do not mow on inclines with a slope in excess of 15 degrees (a dse of approximately 2-1/2 feet every 10 feet). A dding mower could
overturn and cause sedous injury. If operating a walk-behind mower on such a slope, it is extremely difficult to maintain your footing
and you could slip, resulting in 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.