Troubleshooting guide, Problem Cause | HTC Z4220, Z4824, Z5426, Z4619

troubleshooting guide

Problem

Cause

The engine will not start.

•The blade switch is engaged.

•The steering controls are not locked in the neutral position.

•The driver is not sitting in the driver’s seat.

•The parking brake is not activated.

•The battery is dead.

•Contamination in the carburetor or fuel line.

•The fuel supply is closed or the tap for the fuel tank is in the wrong position.

•Clogged fuel filter or fuel line.

The starter does not turn the engine over.	•	Dead battery.
	• Poor contacts on the battery terminal cable
		connections.
	•	Fuse blown.
	•	Ignition system faulty.
	• Fault in the starter safety circuit. See Checking the
		Safety System in the “Maintenance Section,”

The engine runs rough.	•	Faulty carburetor.
	• The choke control is pulled out with warm engine.
	•	Defective valves.
	• Defective piston, cylinder, piston ring, or
		cylinder head seal.
	• The cylinder head bolts are loose.
	• Clogged fuel filter or jet.
	• Clogged ventilation valve on the fuel cap.
	• Fuel tank nearly empty.
	•	Defective spark plug.
	• The spark plug is loose.
	•	Defective ignition cable.
	• Defective spark plug electrode.
	• Defective spark plug connection.
	• Rich fuel mixture or fuel-air mixture.
	•	Wrong fuel type.
	• Water in the fuel.
	•	Clogged air filter.
	• Air trapped in hydraulic system.

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