Husqvarna IZ 21 manual Trouble Shooting Guide, The engine overheats

TROUBLE SHOOTING GUIDE

The engine overheats.	•	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.
	•	Defective spark plugs.
	• Pre-ignition incorrect.
Battery not charging.	•	Poor contact with battery terminal
		cable connectors.
The machine moves slowly, unevenly,	•	Parking brake on.
or not at all.	•	Bypass valve on pump open.
	• Drive belt for the pump slack or has come off.
	•	Defective hydraulic system.
	• Air in the hydraulic system.
Mower deck not engaging.	•	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.
Uneven mowing results.	•	Different air pressure in the tires on the left and
		right sides.
	•	Bent blades.
	• The chains for suspending the mower deck
		are uneven.
	• The chain fixture has come loose.
	• The blades are blunt.
	• Driving speed too high.
	• The grass is too long.
	• Grass collected under the mower deck.
The machine vibrates.	•	The blades are loose.
	• The blades are incorrectly balanced.
	• The engine is loose.

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