Gravely Pro-Walk Hydro 36HR PS Owner's/Operator's Manual page 49

Mower Deck
Problem
Discharge Chute Plugged
Mower Deck Vibrates
Mower Blades Do Not Engage
Mower Cuts Unevenly
TROUBLESHOOTING
Probable Cause
Grass is wet – mow grass only when dry.
Raise cutting height.
Mowing with engine at less than full throttle.
Ground speed too fast for conditions.
Mower deck drive belt damaged or incorrectly installed.
Mowing with engine at less than full throttle.
Loose hardware.
Mower deck drive belt damaged or incorrectly installed.
Check/replace spindle drive belt.
Blades bolts are loose.
Blades dull, bent or unblalanced.
Remove belt shields and check for debris on sheaves.
Check sheaves for proper alignment or damage. See your
Gravely dealer.
Mower deck drive belt slipping or broken.
Spindle drive belt slipping or broken.
Mower deck belt tension spring not installed or broken.
PTO switch failure.
20-amp fuse is blown (main power circuit).
Loose electrical connections.
Faulty PTO clutch.
Faulty relay or relay connection(s) See Replacing Relays
on page 44.
Mower deck not properly leveled.
Ground speed too fast for conditions.
Engine speed too slow – run engine at full throttle.
Reduce ground speed when making turns.
Blades dull, bent or unblalanced.
Change mowing pattern.
Tire pressure incorrect.
EN - 49