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Husqvarna YTH20K46 Troubleshooting
The
Husqvarna YTH20K46 is a two-wheel drive lawn tractor with cast iron front axle.
This model was manufactured between 2009 and 2010.
The Husqvarna YTH20K46 driveline includes a 36.4 cu.in (597 cc) Kohler
Courage SV600 four-cycle single-cylinder vertical shaft air-cooled
gasoline engine and Tuff Torq K46 belt-driven hydrostatic transmission
with foot-controlled variable speed drive. The engine has a cylinder
bore of 3.7" (94 mm), piston stroke of 3.38" (86 mm), and rated power of
20 hp (14.9 kW).
The maximum forward speed - 5.2 mph (8.4 km/h), max. reverse speed - 2.9
mph (4.7 km/h). The Husqvarna YTH20K46 fitted with 15x6.00-6 front tires
and 18x8.50-10 rear tires. The wheel base is 48" (1220 mm). The lawn
tractor is equipped with a 46" mid-mount 3-blade side discharge mower
deck with cutting height of 1.5-4.5" (37-115 mm), 6 cut positions, and
mechanical lifting.
| Engine Troubleshooting |
| Engine is not starting or hard starting |
| No fuel in fuel tank - Add fuel |
| Low-quality gasoline - Change fuel |
| Water or air in fuel system - Remove air or water from system |
| Disconnected or loose spark plug wire - Check the spark plug wire connection, repair or replace |
| Spark plug is faulty - Replace spark plug |
| Dirty fuel filter - Replace fuel filter |
| Safety contact for brake pedal defective - Install new part |
| Carburetor is not adjusted - Check carburetor float adjustment |
| Poor cylinder compression - Check cylinder block and change worn parts |
| Damaged or incorrectly adjusted choke cable - Adjust properly or change the cable |
| Cooling fins are blocked - Clean and wash as required |
| Defective ignition - Inspect ignition system and change failed components |
| Stuck or faulty choke cable - Change or clean the cable |
| Plugged air filter - Clean or change air filter |
| Dirty or defective fuel pump - Inspect fuel pump and change as required |
| Engine starts but immediately stops |
| Spark plug is defective - Install new spark plug |
| Dirty or defective carburetor - Clean or change carburetor |
| Ignition coil is damaged - Change ignition coil as required |
| Damaged or weak valve springs - Valve springs need to be changed |
| Valves sticking - Service the valves |
| Insufficient engine oil - Check and refill engine oil |
| Engine is under excessive load - Load reducing required |
| Air intake grill is clogged - Clean and wash as required |
| Too lean carburetor mixture - Adjust carburetor properly |
| Ignition timing is wrong - Ignition timing needs to be adjusted correctly |
| Valve setting is wrong - Adjust valves as required |
| Engine knocking sound or abnormal noise |
| Low octane gasoline - Use proper fuel |
| Engine overloaded - Reduce engine load |
| Lack of engine oil - Add oil to the engine crankcase |
| Low idle speed setting is incorrect - Need to adjust idle speed |
| Clogged or damaged fuel pump - Inspect fuel pump and change as required |
| Crankshaft or main bearings are worn out - Change defective components as required |
| Valve clearance is not correct - Need to adjust valve clearance |
| Damaged cylinder bore or piston rings - Replace defective parts |
| Improperly adjusted or dirty carburetor - Adjust the carburetor properly or clean it |
| Air filter is dirty - Change or service air filter |
| Dirty or damaged fuel pump - Service or change fuel pump |
| Ignition system failure - Check ignition and replace faulty components |
| Cylinder head gasket is worn - Install new head gasket |
| Burned or stuck valves - Service or change valves |
| Push rod is worn or defective - Change push rod |
| Worn cylinder block components - Change defective parts |
| Engine uses too much fuel |
| Throttle opening is not full - Adjust or change throttle cable |
| Improper adjustment of carburetor main jet - Adjust the carburetor main jet properly |
| Defective or loose spark plug - Re-tighten or change the spark plug |
| Stuck, burned, or worn valves - Replace or service valves |
| Worn rings, piston, or sleeve - Replace defective components |
| Incorrect valve clearance - Need to adjust valve clearance |
| High engine oil consumption |
| Gaskets or seals may be damaged - Replace worn parts to avoid leaks |
| Worn valve stems and valve guides - Valves must be replaced |
| Worn or broken piston rings - Piston rings need to be replaced |
| Cylinder liner or piston is scuffed - Check liner and piston, change as required |
| Breather pipe or hose is clogged - Replace or clean |
| Hydrostatic Transmission Troubleshooting |
| Hydrostatic transmission is excessively noisy |
| Speed control pedal linkage is bent or not adjusted - Adjust or change linkage |
| Excessive loading - Reduce loading |
| Dirty transmission fluid or insufficient fluid level - Top up to proper level or change transmission fluid |
| Transmission components are damaged or worn - Check internal transmission parts for damage or wear and replace if required |
| Corroded or worn shift linkage - Lubricate or change linkage |
| Worn or seized hydrostatic pump - Change or repair pump |
| Transmission shift control components are worn or unadjusted - Adjust properly or change |
| Lack of transmission oil supply - Fill the transmission housing with oil |
| Worn or damaged drive sheave - Change sheave |
| Shifting linkage is misadjusted or broken - Adjust correctly or replace linkage |
| Speed control linkage is defective or unadjusted - Change or adjust linkage |
| Transmission gaskets or seals are damaged - Seals and gaskets need to be replaced |
| Final drive shaft leaks - Shaft seals need to be changed |
| Cracked transmission case - Install a new transmission case |
| Mower Deck Troubleshooting |
| Mower vibrates too much |
| Mower deck drive sheave is clogged or worn - Service or change sheave |
| Damaged or loose drive belt - Adjust belt tension or replace belt |
| Not balanced or bent mower blades - Balance or replace blades |
| Loose blade mounting bolts - Tighten it fast |
| Constant clogging of discharge chute |
| Fast ground speed - Select a lower speed |
| Long grass - Use a lower cutting height |
| Reduced engine speeds - Choke is not fully opening |
| Low cutting height - Change cutting height adjustment |
| Mower deck drive belt installed incorrectly - Install drive belt as required |
| Lawn mower leaving uncut grass |
| Discharge area is clogged - Clean out the mower deck |
| Blades are not sharp - Need to sharpen the blades |
| Blades are defective or worn - Replace the blades |
| Fast mowing speed - Need to slow down |
| Cutting height is too low - Use a higher cutting height |
| Bagger is overfilled - Bagger must be empty |
| Blades are scalping the grass |
| Bumpy or unleveled lawn - Level the lawn |
| Low cutting height - Raise the cutting height |
| High ground speed - Need to slow down |
| Incorrect level of mower deck - Adjust the level of mower deck correctly |
| Worn or bent blades - Change the blades |
| Incorrect tire pressure - Inflate tires correctly |
| Mower deck to cut unevenly |
| Tire pressure is too low - Correct tire pressure |
| Improperly leveled mower deck - Level the deck correctly |
| Blades are not sharp - Need a blade sharpening |
| Blades are worn or damaged - Install new blades |
| Discharge area is clogged - Check cutting deck and clean as necessary |
| Deck shell is damaged - Rebuild or change mower deck |
| Mower spindle is faulty or loose - Replace or repair the spindle |
| Electrical Troubleshooting |
| Battery won’t charge |
| Loose or corroded electrical wiring connections - Clean or tighten wiring connections |
| Faulty electrical terminal connectors - Change terminal connectors |
| Battery dead cell - Install a new battery |
| Battery power is low - Charge the battery |
| Battery runs out quickly - Service charging system or change battery |
| Wires are disconnected or battery terminals are corroded - Connect cables correctly or replace terminals |
| Battery is low or faulty - Recharge or replace battery |
| Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required |
| Low battery capacity - Charge the battery |
| Spark plug dirty or improperly gapped - Clean, gap or replace spark plug |
| Starter motor or solenoid is defective - Starter/solenoid needs to be replaced |
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| Lawn and Garden Tractors Technical Specs |
