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Husqvarna TC 138L Troubleshooting

The Husqvarna TC 138L lawn tractor was manufactured between 2019 and 2022. The Husqvarna TC138L driveline consists of Loncin LC1P92F-1 4-cycle vertical-shaft single cylinder air-cooled gasoline engine and Tuff Torq K46 DC belt-driven hydrostatic transmission with infinite forward and reverse gears.

A 27.6 cubic inches (452 cc) engine has a cylinder bore of 3.62" (92 mm), piston stroke of 2.68" (68 mm), and maximum power of 16 hp (11.9 kW). The fuel system has a fixed main jet carburetor and pulse fuel pump. The maximum forward speed - 5 mph (8 kph), maximum reverse speed - 2.2 mph (3.5 kph).

The Husqvarna TC 138L lawn tractor is equipped with a manual steering system, pneumatic wheels, 15x6.00-6 front tires, and 18x8.50-8 rear tires. Compatible attachments for the tractor: 38" mid-mount 2-blade side discharge mower deck with cutting height of 1.5-4.0 in (38-101 mm), manual blade engagement, six cut positions, and mechanical lift system with hand operated.

Engine Troubleshooting
Engine difficult to start or doesn't start
Empty fuel tank - Add gasoline
Wrong grade of gasoline - Use quality gasoline
Dirty fuel lines - Inspect and clean
Damaged spark plug wiring connection - Inspect spark plug wiring connection, change or repair
Spark plug is faulty - Install new spark plug
Plugged fuel filter - Replace fuel filter
Defective safety switch - Replace if required
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw
Poor compression - Inspect and replace wear parts
Damaged or incorrectly adjusted choke cable - Adjust correctly or replace the cable
Engine runs irregularly
Plugged cooling fins - Need to clean or wash
Ignition failure - Check ignition and replace faulty components
Throttle cable is defective or stuck - Clean or change the cable
Air filter is dirty - Replace or service air filter
Clogged or damaged fuel pump - Service or change fuel pump
Engine starts but then stalls
Spark plug is faulty - Spark plug need to be replaced
Defective or dirty carburetor - Replace or service carburetor
Ignition coil is damaged - Change ignition coil as required
Valve springs are weak or broken - New valve springs need to be installed
Valves sticking - Valves need to be cleaned
Engine keeps overheating
Low engine oil level - Need to add engine oil
Engine is running overloaded - Reduce load
Cooling fins are clogged - Wash or clean as required
Carburetor mixture is too lean - Make the correct settings
Wrong ignition timing - Adjust ignition timing as required
Valve setting is incorrect - Set the valves properly
Engine knocking or noise
Stale or low octane fuel - Use proper gasoline
Engine is under excessive load - Load reducing required
Engine oil level low - Add oil to the engine crankcase
Too low idle RPM - Adjust idling as required
Fuel pump is dirty or defective - Test fuel pump and replace if necessary
Worn main bearings or crankshaft - Need to install new components
Valve clearance is incorrect - Check and adjust
Piston rings or cylinder bore are worn - Change faulty components
Lack of engine power
Carburetor is dirty or incorrectly adjusted - Carburetor needs to be adjusted correctly or cleaned
Air filter is dirty - Service or replace air filter
Clogged or defective fuel pump - Test fuel pump and change if necessary
Ignition system is defective - Inspect ignition system and change failed components
Worn cylinder head gasket - Change cylinder head gasket
Valves are burned or stuck - Replace or clean valves
Worn or damaged push rod - Push rod needs to be changed
Damaged cylinder block components - Replace defective components
High fuel consumption
Insufficient throttle opening - Adjust or replace throttle cable
Carburetor main jet adjustment is improper - Adjust it properly
Loose or defective spark plug - Spark plug need to be tightened or replaced
Burned, worn, or stuck valves - Replace or clean valves
Worn rings, piston, or sleeve - Replace faulty parts
Valve clearance is improper - Adjust valve clearance
Excessive oil consumption
Gaskets or seals may be damaged - Worn parts need to be replaced
Damaged valve guides or valve stems - Valves replacement required
Piston rings are stuck or broken - Install new piston rings
Scored piston or cylinder liner - Inspect liner and piston, replace as necessary
Breather hose or pipe is plugged - Service or change

Hydrostatic Transmission Troubleshooting
HST transmission is excessively noisy
Worn or out of adjustment speed control linkage - Change or adjust linkage
Transmission is under excessive load - Reduce loading
Low transmission oil level or contaminated oil - Add oil to the correct level or fill the transmission with fresh oil
Worn or defective transmission components - Change or repair defective parts
Hard to shift
Stuck or damaged gshift linkage - Replace or repair the linkage
Blocked or faulty hydrostatic pump - Replace or repair pump
Misadjusted or faulty transmission shift control components - Change or adjust correctly
Loss of power
Lack of transmission fluid - Add fluid to the transmission housing
Defective or worn drive sheave - Install a new sheave
Shifter linkage is not adjusted or faulty - Adjust properly or replace linkage
Worn or out of adjustment speed control linkage - Adjust or repair linkage
Transmission leakage
Worn transmission seals or gaskets - Install new seals or gaskets
Final drive shaft leaks - Change shaft seals
Cracked transmission housing - Replace housing or transmission assembly

Mower Deck Troubleshooting
Mower vibrates too much
Mower deck drive sheave is clogged or worn - Replace or clean sheave
Loose or damaged drive belt - Adjust belt tension or install a new belt
Cutting blades are bent or unbalanced - Change or balance blades
Blade mounting bolts are loose - Bolts should be tightened
Discharge chute is constantly plugged
Mowing speed is too high - Use a slower speed
Long grass - Use a lower cutting height
Low engine speeds - Adjust throttle to full opening
Cutting level is too low - Adjust mower to higher cutting height
Improper drive belt installation - Drive belt must be installed correctly
Patches of grass uncut
Deck clogged with grass clippings - Need to clean the mower deck
Blades are too dull - Blades need to be sharpened
Worn or damaged blades - Blades must be changed
Fast ground speed - Use a lower speed
Cutting level is too low - Change cutting height adjustment
Grass bag is full - Clean grass bag
Blades scalp the grass
Bumpy or unleveled lawn - Lawn leveling required
Mower deck set to low cutting - Need to set high cutting height
High mowing speed - Use a lower speed
Improper mower deck level - Level the deck correctly
Blades are bent or worn - Blades must be changed
Tires are not correctly inflated - Inflate tires as required
Uneven cutting
Incorrect tire pressure - Inflate tires as required
Deck level is not correct - Level the deck properly
Not sharp blades - Need to sharpen the blades
Blades are worn or damaged - Blades need to be replaced
Discharge chute is plugged - Need to clean the mower deck
Damaged mower deck housing - Replace or rebuild mower deck
Mower spindle is loose or defective - Replace or repair the spindle

Electrical Troubleshooting
Battery won’t charge
Wiring connections are loose or corroded - Tighten or clean connections
Defective battery terminal clamps - Change terminal clamps
Bad cell in battery - Battery replacement required
Starter cranks slow
Low battery output - Battery is drained, recharge it
Battery runs out quickly - Service or replace the battery
Battery cables are disconnected or terminals are faulty - Connect cables properly or replace terminals
Starter is not working
Battery is low or faulty - Charge or replace the battery
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly
Battery voltage is low - Charge the battery
Faulty or incorrectly gapped spark plug - Replace or clean and gap
Starter motor or solenoid is damaged - Repair starter or install a new solenoid



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