Husqvarna 966061101 Operator's Manual page 57

Problem
Machine vibrates.
Machine backfires (propane engine only).
Engine overheats.
Battery not charging.
Machine moves slowly, unevenly, or not at all.
Mower deck not engaging.
Hydraulic drive leaks oil.
Uneven mowing results.
TROUbleshOOTINg gUIDe
Cause
• Blades are loose.
• Blades are incorrectly balanced.
• Engine is loose.
• one cylinder not receiving spark.
• 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.
• Parking brake on.
• Bypass valve on pump open.
• Drive belt for the transmission gears slack or has
come off.
• Air in hydraulic system.
• Drive belt for the mower deck has come loose.
• Contact for the electromagnetic coupling has
loosened.
• The blade switch is faulty or has come loose, from
the cable contact.
• The fuse has blown.
• 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.
• The grass is too long.
• Grass collected under the mower deck.
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