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Husqvarna LTH1738 Troubleshooting

The Husqvarna LTH1738 lawn tractor was manufactured between 2017 and 2019. The Husqvarna LTH1738 driveline consists of a Loncin LC1P92F-1 four-cycle vertical-shaft single cylinder air-cooled gasoline engine and Tuff Torq K46 BA 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 max power of 16 hp (11.9 kW). The fuel system has a fixed main jet carburetor, pulse fuel pump, and in-line fuel filter. The maximum forward speed - 5.5 mph (8.8 kph), maximum reverse speed - 2.9 mph (4.6 kph).

The Husqvarna LTH1738 tractor is equipped with a manual steering system, pneumatic wheels, 15x6.00-6 front tires, and 20x8.00-8 rear tires. Compatible attachments for the lawn tractor: 38" mid-mount 2-blade mower deck with cutting height of 1.5-4.0 in (38-101 mm), manual blade engagement, six cut positions, and mechanical lift system.

Engine Troubleshooting
Engine hard to start or won't start
Fuel tank is empty - Add fuel
Wrong fuel grade - Use quality fuel
Dirt and debris in fuel system - Remove debris and dirt
Faulty spark plug wire connection - Inspect the spark plug wire connection, replace or repair
Defective spark plug - Change spark plug
Dirty fuel filter - Change fuel filter
Safety contact for brake pedal defective - Install new part
Wrong carburetor adjustment - Adjusting carburetor correctly
Bad compression - Check and change damaged parts
Choke cable is damaged or not adjusted properly - Adjust properly or change the cable
Rough engine running
Plugged cooling fins - Wash or clean as required
Ignition system failure - Check ignition and replace faulty components
Throttle cable is stuck or faulty - Clean or change the cable
Air filter is blocked - Replace or service air filter
Fuel pump is dirty or defective - Test fuel pump and replace if necessary
Engine starts but then stops
Faulty spark plug - Install new spark plug
Carburetor is faulty or clogged - Replace or service carburetor
Damaged ignition coil - Ignition coil should be replaced
Bad or broken valve springs - Replace valve springs
Valves sticking - Service the valves
Engine is overheated
Engine oil insufficient - Need to add engine oil
Engine is overloaded - Reduce engine load
Air intake screen is blocked - Wash or clean as required
Carburetor is running lean - Adjust carburetor properly
Improper ignition timing - Adjust ignition timing correctly
Valve setting is wrong - Adjust valves correctly
Abnormal engine knocking or noise
Stale gasoline - Use proper gasoline
Engine is running overloaded - Reduce engine load
Engine oil level is low - Checking oil level and add if necessary
Incorrectly adjusted low idle speed - Adjustment required
Dirty or damaged fuel pump - Test fuel pump and change if necessary
Worn main bearings or crankshaft - Have bearings or crankshaft replaced
Improper valve clearance - Adjust valve clearance
Damaged cylinder bore or piston rings - Change defective components
Engine power is insufficient
Dirty or improperly adjusted carburetor - Adjust the carburetor correctly or clean it
Air filter element is plugged - Replace or clean air filter
Fuel pump is faulty or clogged - Check fuel pump and change if required
Defective ignition system - Inspect ignition system and change faulty parts
Cylinder head gasket is defective - Install new head gasket
Stuck or burned valves - Change or service valves
Worn or bent push rod - Push rod needs to be changed
Cylinder block components are faulty - Replace defective parts as required
High fuel consumption
Choke didn't open fully - Adjust or change choke cable
Carburetor main jet adjustment is improper - Adjust the carburetor main jet properly
Loose or faulty spark plug - Re-tighten or replace spark plug
Valves are worn, burned or stuck - Change or service valves
Worn piston, rings, or sleeve - Replace defective parts as required
Excessive valve clearance - Adjust valve clearance according to specifications
High engine oil consumption
Seals or gaskets are wearing excessively - Replace defective parts
Damaged valve stems or valve guides - Need to replace the valves
Piston rings are defective or worn - Change piston rings
Cylinder liner or piston is worn - Check piston and liner, replace as required
Clogged breather pipe or hose - Replace or clean

Hydrostatic Transmission Troubleshooting
HST transmission is making noise
Speed control pedal linkage is damaged or out of adjustment - Adjust or replace linkage
Excessive transmission load - The load should be reduced
Contaminated transmission fluid or low fluid level - Fill to required level or change the fluid
Worn or defective transmission components - Check internal transmission parts for damage or wear and replace if required
Difficult shifting
Corroded or worn shift linkage - Lubricate or change linkage
Faulty or blocked hydrostatic pump - Repair or replace pump
Transmission shift control components are worn or unadjusted - Adjust correctly or replace
Power is insufficient
Low fluid level - Check and refill the transmission fluid
Worn or defective drive pulley - Replace pulley
Shifter linkage is not adjusted or faulty - Adjust properly or change linkage
Bent or unadjusted speed control pedal linkage - Change or adjust linkage
Transmission leaks
Damaged transmission seals or gaskets - Install new gaskets or seals
Final drive shaft leaks - Shaft seals need to be changed
Cracked transmission housing - Replace housing or transmission assembly

Mower Deck Troubleshooting
Mower vibrates excessively
Mower deck drive sheave is clogged or worn - Clean or replace sheave
Loose or damaged drive belt - Adjust belt tension or change the belt
Bent or unbalanced mower blades - Balance or replace blades
Loose blade mounting bolts - Bolts should be tightened
Discharge chute is regularly plugged
Mowing speed is too high - Operate at slower speed
Tall grass - Need to set low cutting height
Engine is running at too low speed - Open throttle fully
Mower cuts too low - Change cutting height adjustment
Mower deck drive belt installed incorrectly - Install drive belt correctly
Streaking of uncut grass
Cutting deck is clogged - Inspect and clean cutting deck
Blades are not sharp - Need a blade sharpening
Blades are defective or worn - Blades must be changed
Mowing speed is too high - Use a lower speed
Low cutting height - Use a higher cutting height
Full bagger - Empty the bagger
Blades are scalping the grass
Uneven or bumpy lawn - Level the lawn
Cutting level is too low - Use a higher cutting height
High ground speed - Need to slow down
Incorrectly leveled mower deck - Deck needs to be adjusted properly
Blades are worn or bent - Replace the blades
Incorrect tire pressure - Correct tire pressure
Uneven cut
Incorrect tire pressure - Check and inflate the tires
Incorrectly leveled mower deck - Deck should be adjusted correctly
Blades are excessively dull - Blades need to be sharpened
Worn or defective blades - Install new blades
Deck clogged with grass clippings - Mower deck needs to be cleaned
Deck housing is damaged - Repair or change the deck
Loose or faulty mower spindle - Replace or repair the spindle

Electrical Troubleshooting
Battery won’t charge
Loose or corroded electrical wiring connections - Service or tighten connections
Defective battery terminal connectors - Terminal connectors should be replaced
Dead cell in battery - Replace the battery
Starter turning slow
Battery voltage is low - Battery needs to be recharged
Battery discharges quickly - Battery needs to be serviced or replaced
Bad terminals or disconnected battery cables - Connect wires correctly or change terminals
Starter is not working
Battery is drained or worn - Battery needs to be recharged or replaced
Wiring is improperly connected or disconnected - Check wiring and connect properly
Battery voltage is low - Recharge the battery
Incorrectly gapped or worn spark plug - Clean, gap or change spark plug
Damaged starter motor or solenoid - Starter/solenoid needs to be replaced



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