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Husqvarna LT126 Troubleshooting

The Husqvarna LT126 lawn tractor was manufactured from 2009 to 2013. The Husqvarna LT 126 is powered by 2 engines: a 21.1 cu.in (344 cc) Briggs and Stratton 21R707 Intek 4-cycle single cylinder OHV vertical shaft air-cooled gasoline engine with a rated power of 11.5 hp (8.5 kW), or 21.1 cu.in (344 cc) Briggs and Stratton 219807 Power Built 4-cycle single cylinder OHV vertical shaft air-cooled gasoline engine with a rated power of 12.5 hp (9.3 kW).

The Husqvarna LT126 is fitted with a Peerless 206-565 machanical transmission with 6 forward and 1 reverse gears. Max travel speed (forward/reverse): 4.5 mph (7.2 km/h) and 1.6 mph (2.6 km/h). The tractor is equipped with a manual steering system, pneumatic wheels, 13x5.00-6 front tires, and 16x6.50-8 rear tires. The wheelbase is 46.8" (1190 mm).

The Husqvarna LT 126 is compatible with a 30" mid-mount 1-blade side discharge mower deck with cutting height of 0.8-3.2" (20-80 mm), 6 cut positions, manual blade engagement, and mechanical lift system.

Engine Troubleshooting
Engine doesn't start or hard to start
Gas tank is empty - Fill fuel up
Improper fuel grade - Change fuel
Air in the fuel system - Air bleeding
Spark plug wire is disconnected or loose - Check spark plug wiring connection, repair or change
Spark plug is faulty - Change spark plug as required
Fuel filter is clogged - Change fuel filter
Brake pedal not depressed - Press the brake pedal
Carburetor not adjusted - Adjust according to instructions
Weak cylinder compression - Inspect cylinder block and change worn parts
Throttle cable is adjusted incorrectly or damaged - Change cable or adjust correctly
Engine runs unevenly
Air intake screen is blocked - Need to clean or wash
Ignition system is defective - Check ignition and replace faulty components
Stuck or defective choke cable - Change or service the cable
Clogged air filter - Change or service air filter
Dirty or faulty fuel pump - Clean or change fuel pump
Engine starts but then shuts off
Defective spark plug - Change spark plug as required
Carburetor is faulty or clogged - Clean or change carburetor
Defective ignition coil - Install a new ignition coil
Valve springs are worn or loose - Replace valve springs
Valves are stuck - Valves need to be cleaned
Engine overheated
Low engine oil level - Check oil level and add oil as required
Engine is running overloaded - Load reducing required
Cooling fins are blocked - Need to wash or clean
Too lean carburetor mixture - Adjust carburetor correctly
Bad ignition timing - Adjust ignition timing correctly
Valve setting is wrong - Valves needs to be adjusted properly
Engine noise or knocking
Stale or low octane fuel - Use correct fuel
Engine is overloaded - Load reducing is recommended
Engine oil level low - Checking oil level and add if necessary
Low idle speed setting is not correct - Adjustment required
Dirty or defective fuel pump - Service or change fuel pump
Main bearings or crankshaft are worn out - Need to install new components
Valve clearance is not correct - Adjust valve clearance
Piston rings or cylinder bore are damaged - Change defective parts
Engine power loss
Incorrectly adjusted or dirty carburetor - Carburetor needs to be adjusted correctly or cleaned
Dirty air filter element - Service or change air filter
Clogged or damaged fuel pump - Check fuel pump and change if required
Defective ignition - Inspect ignition system and change failed components
Worn cylinder head gasket - Replace the gasket as required
Valves are stuck or burned - Replace or service valves
Push rod is damaged or worn - Replace push rod
Cylinder block parts are worn out - Defective components need to be replaced
Engine using too much gasoline
Insufficient throttle opening - Adjust or replace throttle cable
Improper carburetor main jet adjustment - Adjust main jet as required
Defective or loose spark plug - Tighten or replace spark plug
Valves are worn, stuck, or burned - Replace or service valves
Worn sleeve, piston, or rings - Change defective components
Valve clearance is improper - Adjust to proper valve clearance
Engine oil consumption is too high
Damaged gaskets or seals - Replace worn parts to avoid leaks
Damaged valve stems or valve guides - Valves need to be changed
Stuck or defective piston rings - Change the piston rings as required
Cylinder liner or piston is scored - Check piston and liner, change as required
Plugged breather pipe or hose - Replace or service

Transmission Troubleshooting
Difficulty shifting gears
Gear shift linkage is stuck or damaged - Clean or change shift linkage
Bent or worn shift forks - Change the shift forks
Defective gearshift mechanism - Replace defective components
Transmission makes excessive noise
Low transmission fluid level - Add fluid to the transmission housing
Dirty transmission fluid - The fluid must be changed
Bearings are worn or gears are damaged - Install new gears or bearings
Transmission jumps out of gear
Damaged or incorrectly installed gear shift lever - Install the lever correctly or replace it
Worn or damaged gear teeth - Replace gears
Shift rods or shift forks are faulty - Replace defective forks or rods
Transmission slipping
Drive belt/shaft is improperly adjusted or worn - Replace belt/shaft or adjust it
Worn brake/clutch or improper brake/clutch adjustment - Adjust clutch/brake or install a new one
Drive pulley is worn or faulty - Replace pulley

Mower Deck Troubleshooting
Mower vibration is excessive
Drive pulley of mower deck is damaged or dirty - Change or clean pulley
Loose or worn drive belt - Replace belt or adjust belt tension
Mower blades are not balanced or warped - Change or balance blades
Loose blade mounting bolts - Tighten it fast
Discharge chute is regularly plugged
High ground speed - Operate at slower speed
Grass is too long - Use a lower cutting height
Engine runs at low revs - Adjust carburetor to higher rpm
Mower cuts too low - Adjust mower to higher cutting height
Incorrect mower drive belt installation - Check drive belt for correct installation
Mower leaving random uncut of grass
Clogged mower deck - Clean out the mower deck
Blades are excessively dull - Blades need to be sharpened
Damaged or worn blades - Blades must be changed
Mowing speed is too high - Use a lower speed
Mower cuts too low - Change cutting height adjustment
Grass bag is overfilled - Grass bag must be empty
Blade scalped grass
Lawn is bumpy or not smooth - Level the lawn
Cutting level is too low - Change cutting height adjustment
Fast ground speed - Select a lower speed
Incorrect level of mower deck - Adjust the level of mower deck correctly
Damaged or bent blades - Install new blades
Tire pressure is too low - Inflate tires as required
Uneven cut
Tires are not properly inflated - Correct tire pressure
Deck is not leveled correctly - Level the deck correctly
Blades are excessively dull - Need a blade sharpening
Blades are worn or damaged - Blades need to be replaced
Clogged mower deck - Mower deck needs to be cleaned
Broken mower deck shell - Repair or replace the deck
Loose or defective mower spindle - Repair or replace the spindle

Electrical Troubleshooting
Battery cannot be charged
Loose or corroded cable connections - Tighten or service connections
Faulty battery terminal clamps - Replace terminal clamps
Worn-out battery - Use a new battery
Starter motor turns slow
Battery power is low - Charge the battery
Battery will not hold charge - Service or change the battery
Bad terminals or disconnected battery cables - Connect wires properly or change terminals
Starter motor is not working
Battery is low or faulty - Charge or replace the battery
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required
Battery power is low - Recharge the battery
Spark plug dirty or improperly gapped - Clean and gap or replace
Faulty solenoid or starter motor - Repair starter or change solenoid



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