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Craftsman LT2500 Troubleshooting

The Craftsman LT2500 is a 2-wheel drive lawn tractor. This model was manufactured by MTD built between 2013 and 2019. The Craftsman LT2500 driveline system components: Kohler Courage SV620 four-cycle single cylinder air-cooled gasoline engine and MTD 918-04892B belt-driven hydrostatic transmission with infinite forward and reverse gears.

A 36.4 cubic inches (597 cc) engine has a cylinder bore of 3.70" (94 mm), piston stroke of 3.38" (86 mm), and rated power of 22 hp (16.4 kW). Max. travel speed (forward/reverse): 5.5 mph (8.8 km/h) and 2.8 mph (4.3 km/h).

The tractor was equipped with 15x6.00-6 front tires and 20x8.00-8 rear tires. The wheel base is 35 in (880 mm). The Craftsman LT2500 lawn tractor can be equipped with a 46" mid-mount 2-blade mower deck with cutting height of 1.5-4.0 in (37-100 mm) and manual lifting system.

Engine Troubleshooting
Engine doesn't start or starts hard
Gas tank is empty - Fill fuel up
Incorrect fuel grade - Change gasoline
Air in the fuel system - Air bleeding
Defective wiring connection of spark plug - Check the spark plug wire connection, repair or replace
Damaged spark plug - Change spark plug
Clogged fuel filter - Change fuel filter
Brake pedal not depressed - Press the brake pedal
Carburetor problems - Carburetor diagnostics required
Poor cylinder compression - Check cylinder block and change worn parts
Damaged or not adjusted choke cable - Adjust properly or replace the cable
Engine runs intermittently
Air intake grill is clogged - Wash or clean as required
Defective ignition system - Check ignition and replace faulty components
Choke cable is faulty or stuck - Service or replace the cable
Plugged air filter - Service or change air filter
Dirty or damaged fuel pump - Test fuel pump and change if necessary
Engine starts but then stops
Defective spark plug - Change spark plug as required
Dirty or defective carburetor - Service or replace carburetor
Damaged ignition coil - Replace ignition coil as necessary
Valve springs are damaged or weak - New valve springs need to be installed
Stuck valves - Service the valves
Engine overheating
Engine oil insufficient - Add oil to the engine crankcase
Engine is running overloaded - Load reducing required
Cooling fins are plugged - Wash or clean as required
Carburetor fuel mixture is too lean - Adjust carburetor properly
Ignition timing is improper - Adjust ignition timing correctly
Improper valve setting - Adjust valves as required
Abnormal engine noise or knocking
Stale or low octane fuel - Use correct gasoline
Excessive engine load - Load reducing required
Insufficient engine oil - Need to add engine oil
Wrong adjustment of low idle speed - Adjustment required
Fuel pump is defective or dirty - Inspect fuel pump and change as required
Main bearings or crankshaft failure - Need to install new components
Excessive valve clearance - Check and adjust
Damaged cylinder bore or piston rings - Replace defective parts
Engine power is too low
Carburetor is improperly adjusted or clogged - Adjust the carburetor properly or clean it
Clogged air filter - Service or replace air filter
Dirty or damaged fuel pump - Clean or install new fuel pump
Ignition system failure - Check ignition and replace faulty components
Defective cylinder head gasket - Replace cylinder head gasket
Stuck or burned valves - Replace or service valves
Push rod is bent or worn - Change push rod
Damaged cylinder block components - Defective components need to be replaced
Excessive fuel consumption
Throttle opening is not full - Adjust or change throttle cable
Carburetor main jet is incorrectly adjusted - Adjust it correctly
Spark plug is faulty or loose - Re-tighten or replace spark plug
Valves are stuck, worn, or burned - Service or replace valves
Piston, sleeve, or rings are damaged - Replace faulty parts
Valve clearance is not correct - Adjust valve clearance according to specifications
High engine oil consumption
Seals or gaskets are defective - To repair leaks, replace worn parts
Valve guides and stems are worn - Need to replace the valves
Stuck or worn piston rings - Install new piston rings
Damaged piston or cylinder liner - Inspect piston and liner, replace as required
Blocked breather pipe or hose - Service or replace

Transmission Troubleshooting
Difficult to shift gears
Loose or broken gear shift linkage - Change defective shift linkage
Shift forks are damaged or worn - Replace defective shift forks
Defective parts in the gearshift mechanism - Replace defective parts
Transmission is excessively noisy
Fluid level is low - Check and refill the transmission fluid
Transmission oil is dirty - Transmission oil change required
Bearings or gears are worn - Change gears or bearings
Transmission pops out of gear
Incorrectly installed or bent shift lever - Install the lever properly or replace it
Worn or damaged gear teeth - Install new gears
Worn shift rods or shift forks - Replace defective forks or rods
Transmission slips
Drive belt/shaft is incorrectly adjusted or defective - Adjust or replace belt/shaft
Clutch/brake is incorrectly adjusted or defective - Adjust clutch/brake or install a new one
Worn or defective drive pulley - Replace pulley

Hydrostatic Transmission Troubleshooting
HST transmission is making noise
Speed control pedal linkage is damaged or out of adjustment - Adjust or replace linkage
Transmission overload - Reduce transmission load
Transmission oil is contaminated or oil level is insufficient - Change transmission oil or top up to proper level
Damaged or worn components of hydrostatic transmission - Check internal transmission parts for damage or wear and replace if required
Shifting is hard
Shift linkage is stuck or damaged - Clean or change linkage
Hydrostatic pump is blocked or defective - Repair or change pump
Unadjusted or damaged transmission shift control parts - Change or adjust correctly
Loss of power
Lack of transmission fluid - Add fluid to the transmission housing
Drive sheave is defective or worn - Install a new sheave
Misadjusted or faulty shifting linkage - Change or adjust linkage
Defective or not adjusted speed control pedal linkage - Adjust or replace linkage
Transmission leakage
Broken transmission gaskets or seals - Replace seals or gaskets
Final drive shaft is leaking - Shaft seals need to be changed
Cracked transmission case - Change broken case

Mower Deck Troubleshooting
Excessive mower vibration
Dirty or worn mower drive sheave - Service or replace sheave
Damaged or loose drive belt - Adjust belt tension or change the belt
Bent or unbalanced cutting blades - Balance or change blades
Loose blade mounting bolts - Tighten it fast
Discharge chute is constantly plugged
High ground speed - Select a slower speed
Long grass - Need to set low cutting height
Engine runs at low revs - Adjust choke to full opening
Mower cuts too low - Need to set high cutting height
Mower drive belt installation is improper - Drive belt must be installed correctly
Uncut grass when mowing
Clogged mower deck - Inspect and clean cutting deck
Blades are too dull - Need a blade sharpening
Worn or defective blades - Blades need to be replaced
High mowing speed - Use a lower speed
Low cutting height - Use correct cutting height
Full grass bag - Grass bag must be empty
Blades are scalping the grass
Lawn is bumpy or not smooth - Level the lawn
Mower deck cutting height is set too low - Need to set high cutting height
High ground speed - Operate at slower speed
Improper mower deck level - Deck should be adjusted correctly
Bent or worn blades - Blades must be changed
Incorrect tire pressure - Correct tire pressure
Uneven cut
Low tire inflation - Check and inflate the tires
Mower deck is not leveled properly - Adjust the level of mower deck correctly
Blades are not sharp - Need a blade sharpening
Worn or bent blades - Blades must be changed
Cutting deck is clogged - Clean out the mower deck
Deck shell is broken - Repair or replace the deck
Mower spindle is bent or loose - Repair or change the spindle

Electrical Troubleshooting
Battery won’t charge
Wiring connections are corroded or loose - Tighten or service connections
Faulty battery terminal clamps - Install new terminal clamps
Dead cell in battery - Battery change required
Starter motor turns slow
Low battery capacity - Low battery charging, charge as required
Battery discharges quickly - Service or replace the battery
Bad battery terminals or disconnected wiring - Check wiring and clean or replace terminals
Starter will not work
Battery is discharged or worn - Charge or change the battery
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly
Low battery output voltage - Charge the battery
Spark plug faulty or incorrectly gapped - Clean and gap or replace
Solenoid or starter motor is faulty - Repair starter or change solenoid



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