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Husqvarna YT42DXL Troubleshooting

The Husqvarna YT42DXL is a two-wheel drive lawn tractor. This model was manufactured from 2017 to 2022. The Husqvarna YT42DXL drivetrain system components: Kohler KT725 7000 Series 4-cycle twin-cylinder air-cooled vertical shaft gasoline engine and Tuff Torq K46 BT belt-driven hydrostatic transaxle with foot-controlled variable speed drive.

A 44.2 cu.in (725 cc) engine has a cylinder bore of 3.27" (83 mm), piston stroke of 2.64" (67 mm), and max power of 22 hp (16.3 kW). The maximum travel speed (forward/reverse): 5.5 mph (8.8 km/h) and 2.4 mph (3.8 km/h).

The Husqvarna YT42DXL tractor is equipped with a manual steering system, pneumatic wheels, 15x6.00-6 front tires, and 20x8.00-8 rear tires. The lawn tractor is compatible with a 42" mid-mount 2-blade side discharge mower deck with cutting height of 1.5-4.0 in (38-101 mm), electric blade engagement, 7 cut positions, two anti-scalp wheels, and mechanical lifting system.

Engine Troubleshooting
Engine starts hard or won't start
No gasoline in tank - Fill it up
Incorrect fuel grade - Change fuel
Air in fuel system - Bleed fuel system
Defective wiring connection of spark plug - Check the spark plug wire connection, repair or replace
Spark plug is defective - Install new spark plug
Clogged fuel filter - Fuel filter needs changing
Brake pedal not pushed down - Push the brake pedal down
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw
Low engine compression - Inspect cylinder block and change defective components
Incorrectly adjusted or damaged throttle cable - Change cable or adjust correctly
Irregular engine running
Cooling fins are plugged - Wash or clean as required
Ignition failure - Inspect ignition system and change failed components
Throttle cable is stuck or defective - Clean or change the cable
Dirty air filter element - Service or change air filter
Clogged or defective fuel pump - Check fuel pump and change if required
Engine starts but stops suddenly
Defective spark plug - Install new spark plug
Carburetor is clogged or defective - Repair or clean carburetor
Ignition coil is not working - Ignition coil should be replaced
Damaged or weak valve springs - Install new valve springs
Valves sticking - Clean the valves
Engine overheats
Low engine oil level - Fill up the oil to required level
Engine is overloaded - Load reducing required
Cooling fins are plugged - Clean and wash as required
Carburetor is running lean - Adjust carburetor correctly
Ignition timing is wrong - Set the ignition timing properly
Valve setting is incorrect - Valves needs to be set correctly
Engine knocking sound or abnormal noise
Stale gasoline - Change fuel
Excessive engine load - Load reducing is recommended
Engine oil insufficient - Checking oil level and add if necessary
Wrong adjustment of low idle speed - Correct idle adjustment
Clogged or defective fuel pump - Test fuel pump and change if necessary
Worn main bearings or crankshaft - Change defective components as required
Valve clearance is incorrect - Adjust valve clearance according to specifications
Damaged cylinder bore or piston rings - Change faulty parts
Low engine power
Carburetor is improperly adjusted or clogged - Adjust the carburetor properly or clean it
Air filter is dirty - Change or clean air filter
Clogged or damaged fuel pump - Clean or replace fuel pump
Defective ignition system - Inspect ignition system and change failed components
Blown cylinder head gasket - Replace cylinder head gasket
Valves are stuck or burned - Change or service valves
Worn or damaged push rod - Change push rod
Damaged cylinder block parts - Replace defective components
Engine using too much gasoline
Insufficient choke opening - Inspect choke cable and adjust as required
Carburetor main jet adjustment is improper - Adjust it properly
Spark plug is loose or defective - Change or re-tighten spark plug
Stuck, worn, or burned valves - Clean or change valves
Sleeve, rings, or piston are damaged - Change defective parts
Valve clearance is not correct - Adjust valve clearance according to specifications
Engine using too much oil
Gaskets or seals may be damaged - Install new components
Damaged valve guides or valve stems - Valves need to be changed
Piston rings are seized or worn - Change the piston rings as required
Piston or cylinder liner is damaged - Check piston and liner, replace as required
Breather pipe or hose is blocked - Service or change

Hydrostatic Transmission Troubleshooting
HST transmission noise
Worn or out of adjustment speed control linkage - Adjust or replace linkage
Transmission overload - Reduce transmission load
Contaminated transmission fluid or low fluid level - Pour fresh fluid or add transmission fluid to proper level
Worn or defective transmission components - Change or repair defective parts
Hard to shift
Corroded or worn shift linkage - Lubricate or change linkage
Hydrostatic pump is blocked or defective - Repair or replace pump
Transmission shift control components are defective or misadjusted - Adjust properly or change
Loss of power
Lack of transmission oil supply - Add oil to the transmission housing
Worn or faulty drive pulley - Install a new pulley
Not adjusted or damaged shifter linkage - Adjust correctly or change linkage
Speed control linkage is worn or unadjusted - Replace or adjust linkage
Transmission leaks
Transmission gaskets or seals are damaged - Install new seals or gaskets
Final drive shaft is leaking - Change shaft seals
Transmission case is cracked - Replace defective case or transmission assembly

Mower Deck Troubleshooting
Excessive mower vibration
Mower deck drive sheave is clogged or worn - Replace or clean sheave
Loose or defective drive belt - Replace belt or adjust belt tension
Unbalanced or warped cutting blades - Change or balance blades
Loose blade mounting bolts - Bolts need to be tightened
Discharge chute regular clogging
Fast ground speed - Use a slower speed
Long grass - Use a lower cutting height
Engine rpm is too low - Open choke fully
Cutting level is too low - Change cutting height adjustment
Incorrect mower drive belt installation - Drive belt must be installed correctly
Uncut grass when mowing
Discharge chute is plugged - Need to clean the mower deck
Blades are too dull - Sharpen the blades
Worn or damaged blades - Change the blades
Ground speed is too fast - Operate at slower speed
Low cutting height - Use correct cutting height
Full bagger - Empty the bagger
Blades scalping grass
Bumpy or not smooth lawn - Level the lawn
Mower deck set to low cutting - Raise the cutting height
Mowing speed is too high - Select a lower speed
Improper mower deck level - Level the deck correctly
Damaged or bent blades - Install new blades
Tires are not properly inflated - Correct tire pressure
Mower deck to cut unevenly
Tire pressure is too low - Check and inflate the tires
Incorrectly leveled mower deck - Deck needs to be adjusted properly
Excessive blade dullness - Need a blade sharpening
Blades are defective or worn - Install new blades
Cutting deck is clogged - Need to clean the mower deck
Deck housing is broken - Repair or replace the deck
Mower spindle is bent or loose - Change or repair the spindle

Electrical Troubleshooting
Battery does not charge
Wiring connections are corroded or loose - Tighten or clean connections
Battery terminal clamps are defective - Install new terminal clamps
Battery failing - Battery replacement required
Starter turns slow
Battery capacity is low - Recharge the battery
Battery is draining quickly - Service battery or change it
Corroded battery terminals or disconnected wires - Check cable connections and change or clean terminals
Starter is not working
Battery is discharged or defective - Recharge or replace battery
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly
Battery power is low - Charge the battery
Spark plug faulty or incorrectly gapped - Replace or clean and gap
Starter motor or solenoid failing - Starter/solenoid needs to be replaced



Lawn and Garden Tractors Technical Specs