Gravely ZT HD Operator's Manual page 30

Problem Probable Cause
Mower blades not level or mower
deck pitch is incorrect.
Mower blades are dull or faulty.
Poor cutting
Mowing speed is too fast.
quality.
Belt tension or condition is poor. Replace mower belts. Refer to your unit's
Cutting height is too low.
Clutch brake plates worn.
Blades do not
stop within 5
seconds.
TROUBLESHOOTING
EN - 28
Correction
Level and adjust pitch of mower deck.
Refer to your unit's Service Manual.
Sharpen or replace mower blades. Refer
to your unit's Service Manual.
Drive slower when cutting grass.
Service Manual.
Do not set height of cut too low. For very
tall grass, mow twice.
Reverse clutch brake plates. If clutch
brake plates have already been reversed,
replace clutch. Refer to your unit's Service
Manual.