HTC Z4619 User Manual
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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-airmixture.

 

 

Wrong fuel type.

 

 

• Water in the fuel.

 

 

Clogged air filter.

 

 

• Air trapped in hydraulic system.

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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-ignitionincorrect.

 

 

 

 

 

 

 

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.

 

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STORAGE

Winter Storage

At the end of the mowing season, the machine should be readied for storage (or if it will not be in use for longer than 30 days). Fuel allowed to stand for long periods of time (30 days or more) can leave sticky residues that can plug the carburetor and disrupt engine function.

Fuel stabilizers are an acceptable option as regards to the sticky residues that can occur during storage.

Add stabilizer to the fuel in the tank or in the storage container. Always use the mixing ratios specified by the manufacturer of the stabilizer. Run the engine for at least 10 minutes after adding the stabilizer so that it reaches the carburetor. Do not empty the fuel tank and the carburetor if you have added stabilizer

WARNING!

Never store an engine with fuel in the tank indoors or in poorly ventilated spaces where fuel vapor can come in contact with open flames, sparks, or a pilot light such as in a boiler, hot water tank, clothes drier, etc. Handle the fuel with care.

It is very flammable and can cause serious personal injury and property damage. Drain the fuel into an approved container outdoors and far away from open flame. Never use gasoline for cleaning. Use a degreaser and warm water instead.

To ready the machine for storage, follow these steps:

1.Thoroughly clean the machine, especially under the mower deck. Touch up damage to the paint and spray a thin layer of oil on the underside of the mower deck to avoid corrosion.

2.Inspect the machine for worn or damaged parts and tighten any nuts or screws that may have become loose.

3.Change the engine oil; dispose of properly.

4.Empty the fuel tanks or add a fuel stabilizer. Start the engine and allow it to run until the carburetor is drained of fuel or the stabilizer has reached the carburetor.

5.Remove the spark plug and pour about a tablespoon of engine oil into the cylinder. Turn over the engine so that the oil is evenly distributed and then refit the spark plug.

6.Lubricate all grease zerks, joints, and axles.

7.Remove the battery. Clean, charge, and store the battery in a cool place, but protect it from direct cold.

8.Store the machine in a clean, dry place and cover it for extra protection.

Service

When ordering spare parts, please specify the purchase year, model, type, and serial number.

Always use genuine Husqvarna spare parts.

An annual check-upat an authorized service workshop is a good way to ensure that your machine performs its best the following season.

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WIRING DIAGRAMS

For units produced after to Serial Number 0752XXXXX

SOLENOID

8

14

15

6

PTO

SWITCH

10

ENGINE

GROUND

1.Battery

2.Accessory outlet

3.Key switch

4.To engine pigtail

5.Hour meter

6.Seat switch

7.Run relay

8.Blade switch

9.Brake relay

10.Electric clutch

11.Brake switch

12.Start relay

13.Starter solenoid

14.Left motion control lever

15.Right motion control lever

16.Starter

4

5

2

BLK = Black

BLU = Blue

BRN = Brown

GRN = Green

GRY = Grey

LT.BLU = Light Blue

ORG = Orange

PUR = Purple

RED = Red

WHT = White

YEL = Yellow

NO = Normally Open

NC = Normally Closed

COM = Common

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WIRING DIAGRAMS

For units produced before to Serial Number 0752XXXXX

14

15

1.Battery

2.Accessory outlet

3.Key switch

4.To engine pigtail

5.Hour meter

6.Seat switch

7.Run relay

8.Blade switch

9.Brake relay

10.Electric clutch

11.Brake switch

12.Start relay

13.Starter solenoid

14.Left motion control lever

15.Right motion control lever

16.Starter

BLK = Black

BLU = Blue

BRN = Brown

GRN = Green

GRY = Grey

LT.BLU = Light Blue

ORG = Orange

PUR = Purple

RED = Red

WHT = White

YEL = Yellow

NO = Normally Open

NC = Normally Closed

COM = Common

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