• Clogged air filter
• Fouled spark plugs.
• Carburetor incorrectly adjusted
• Blades are loose.
• Blades are incorrectly balanced.
• Engine is loose.
• Clogged air intake or cooling fins.
• Engine overloaded.
• Poor ventilation around engine.
• Defective engine speed regulator.
• Too little or no oil in the engine.
• Fouled spark plug.
• Poor contact with battery terminal cable
connectors.
• Charging lead is disconnected.
Machine moves slowly, unevenly, or not at all.
• Parking brake on.
• Bypass valve on pump open.
• Drive belt for the transmission is slack or has
come off.
• Air in hydraulic system.
• Drive belt for the mower deck has come
loose.
• Electric connection to clutch has loosened.
• Blade switch is faulty or has come loose from
the cable contact.
• Fuse has blown.
Hydraulic drive leaks oil.
• Damaged seals, housing, or gaskets.
• Air trapped in hydraulic system.
• Unequal tire pressure on the left and right
sides.
• Bent blades.
• Suspension for the mower deck is uneven.
• Blades are dull.
• Driving speed too high.
• Grass is too long.
• Grass collected under the mower deck.
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