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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 |
| 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 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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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| Lawn and Garden Tractors Technical Specs |
