Gravely Pro-Walk Hydro 36HR PS Owner's/Operator's Manual page 50

Machine
Problem
Excessive Machine Vibration
Unit Will Not Move With Engine
Running
Unit Creeps With Engine
Running and Control Levers in a
Neutral Position
TROUBLESHOOTING
Probable Cause
Engine speed too slow.
Deck drive belts worn or damaged.
Pump drive belt worn or damaged.
Dirt or debris on drive sheaves.
Loose or damaged electric PTO or drive sheave.
Bent or damaged cutting blades.
Parking brake engaged.
Hydraulic oil level low.
Hydraulic oil cold – allow engine to warm.
Pump drive belt slipping.
Pump bypass valves open. See MOVING THE UNIT
MANUALLY on page 21.
Pump drive belt damaged or worn.
Wheel motor problems. See your Gravely dealer.
Needs control linkage adjustment. See ADJUSTING
PUMP NEUTRAL POSITION on page 27.
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