HTC Z5426BF, Z4619, Z4220BF, Z4219, Z4824BF manual troubleshooting guide, The engine seems weak

troubleshooting guide

Problem	Cause
The engine seems weak.	•	Clogged air filter.
	•	Defective spark plugs.
	•	Carburetor incorrectly adjusted.
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 plug.
	• Pre-ignition incorrect.
Battery not charging.	•	Poor contact with battery terminal cable
		connectors.
The machine moves slowly, unevenly, or not at all.	•	Parking brake on.
	• Bypass valve on pump open.
	• Drive belt for the transmission gears slack or has
		come off.
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.
Transaxle leaks oil.	•	Damaged seals, housing, or gaskets.
	• Air trapped in hydraulic system.
Uneven mowing results.	•	Different air pressure in the tires on the left and
		right sides.
	•	Bent blades.
	• The suspension for the mower deck is uneven.
	• The blades are dull.
	• 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.

English -54