Husqvarna RZ 016 Operator's Manual page 48

Problem
the engine seems weak.
the engine overheats.
Battery not charging.
the machine moves slowly, unevenly, or not at all.
Mower deck not engaging.
Uneven mowing results.
the machine vibrates.
48 - HUSQVARNA
tROUBLESHOOtING
Cause
Clogged air filter.
Fouled spark plugs.
Carburetor incorrectly adjusted.
Clogged air intake or cooling fins.
Engine overloaded.
Poor ventilation around engine.
Defective engine speed regulator.
Soot in the combustion chamber.
too little or no oil in the engine.
Fouled spark plug.
Poor contact with battery terminal cable connectors.
Parking brake on.
Hydraulic pump bypass linkage engaged.
Drive belt for the transmission gears slack or has
come off.
Defective hydraulic system.
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.
Different air pressure in the tires on 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.
Blades are loose.
Blades are incorrectly balanced.
Engine is loose.