Husqvarna P520 D Operator's Manual page 43

Battery does not charge
Machine vibrates
Uneven mowing
Troubleshooting schedule
One or more battery cells faulty
Poor contact on the battery terminal cable connectors
Defective alternator
Alternator belt broken or slipping
Wires to the alternator broken
Defective battery maintenance
Sulphated battery
Blades are loose
Damaged universal joint
Engine is loose
The hydraulic pump is loose
Damaged support bearing for PTO shaft
Bevel gear is loose
The engine is not firing on all cylinders
Pulley loose or worn bearing on cutting unit
One or more blades unbalanced, caused by damage or poor balancing after
sharpening
Blades blunt
Cutting unit skew
Long or wet grass
Grass blockage under hood
Different tyre pressures on right and left sides
Different tyre pressures on pivot wheel
Over-speeding
Engine speed too low
Cutting unit belt slipping
PTO belt slipping
Cutting height too low
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