Husqvarna MZ28T 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
Uneven mowing results
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TROUBLESHOOTING GUIDE
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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
Fault in engine charging system
Parking brake on
Bypass linkages 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
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