What slope is safe to mow on with the TB30R, and how should I mow on slopes?

Do not operate the TB30R on slopes greater than 12 degrees; a slope gauge is included in the manual to help you measure slopes before operating. Always mow up and down slopes, never across the face of a slope, and use slow speed to maintain control. Avoid sudden changes in speed or direction, and do not mow on wet grass, as reduced traction could cause sliding. (Page 4)