Husqvarna 996613403 Operator's Manual page 50

Problem
Machine vibrates
Engine overheats
Battery not charging
Machine moves slowly, unevenly, or not at all
Mower deck not engaging
Hydraulic drive leaks oil
Uneven mowing results
50
TROUBLESHOOTING GUIDE
Cause
• 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
• 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
• Blade switch is faulty or has come loose, from the
cable contact
• 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
• Grass is too long
• Grass collected under the mower deck