Simplicity 7100 Series Operator's Manual page 13

WARNING
Slope Operation
Never operate on slopes greater than
35 percent (19.3°) which is a rise of 3.5
feet (1067 mm) vertically in 10 feet (3.1
m) horizontally. When operating on
slopes that are greater than 20 percent
(11.3°) use rear wheel weights (see
your dealer). Select slow ground speed
before driving onto slope. Do not use
brakes to control speed. On Semi-
Automatic and 6 Speed models, do
not attempt to shift gears while on
slopes because once out of gear, it may
not be possible to shift into another
gear. Mow UP and DOWN the slope,
never across the face, use caution
when changing directions and DO
NOT START OR STOP ON SLOPES.