Sabo 97-14 HS Operator's Manual page 51

IF
Grass Tips Are Jagged And Turn Grayish Brown
After Mowing
Mower Stops When Shift Lever Is Moved Rearward
and Mower Is Engaged
TROUBLESHOOTING
CHECK
Dull mower blades.
Bent blades.
Front-to-rear blade adjustment not set properly.
Normal condition. (See Using Reverse Implement Option in the
OPERATING section.)
Troubleshooting - 47