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John Deere LT155 Troubleshooting

The John Deere LT155 is a 2-wheel drive lawn tractor from LT-series. This model was manufactured between 1998 and 2001. The John Deere LT155 tractor is powered by Kohler Command CV15S vertical shaft four-cycle single cylinder air-cooled gasoline engine.

A 26.1 cubic inches (426 cc) engine has a cylinder bore of 3.6" (90 mm), piston stroke of 2.64" (67 mm), rated power of 15 hp (11.2 kW), and maximum torque of 33.2 Nm (24.5 lb-ft) at 2400 rpm. The John Deere LT155 is fitted with two transmission options: Dana 4360 mechanical transmission with 5 forward and 1 reverse gears, or Tuff Torq K51A hydrostatic transmission with infinite forward and reverse gears. Max. travel speed (forward/reverse): 5.5 mph (8.8 km/h) and 3 mph (4.8 km/h).

The John Deere LT155 is equipped with a manual steering system, mechanical disc brakes, 15x6.00-6 front tires, and 20x10.00-8 rear tires. The wheel base is 48" (1210 mm). The tractor is compatible with 38", 42" mid-mount 2-blade mower deck with cutting height of 1.0-4.0" (25-102 mm) and manual lifting system, and 42" front-mount blade.

Engine Troubleshooting
Engine starts hard or doesn't start
Gas tank is empty - Fill fuel up
Incorrect fuel grade - Use quality fuel
Clogged fuel system - Remove clogging
Defective spark plug wire connection - Inspect the spark plug wire connection, replace or repair
Spark plug is defective - Change spark plug
Fuel filter is clogged - Fuel filter needs to be replaced
Defective safety switch - Replace if required
Problems with carburetor adjustment - Adjust as required
Low compression - Check and replace worn parts
Damaged or incorrectly adjusted choke cable - Replace cable or adjust correctly
Rough engine running
Air intake grill is clogged - Clean and wash as required
Ignition system failure - Check ignition and replace faulty components
Throttle cable is stuck or faulty - Change or service the cable
Dirty air filter element - Change or clean air filter
Clogged or damaged fuel pump - Clean or replace fuel pump
Engine starts and then shuts off
Spark plug is damaged - Change spark plug as required
Clogged or defective carburetor - Carburetor needs to be replaced or cleaned
Ignition coil is faulty - Install a new ignition coil
Valve springs are worn or loose - Change valve springs
Valves are stuck - Valves must be cleaned
Engine overheats
Not enough engine oil - Fill the crankcase with engine oil
Engine is overloaded - Reduce load
Cooling fins are blocked - Wash or clean as required
Carburetor mixture is too lean - Set the carburetor properly
Ignition timing is wrong - Ignition timing needs to be adjusted correctly
Wrong valve setting - Set the valves correctly
Engine knocking sound or abnormal noise
Low octane gasoline - Use proper fuel
Engine is overloaded - Load reducing required
Engine oil level is low - Add oil to the engine crankcase
Low idle speed setting is incorrect - Adjust idling as required
Dirty or defective fuel pump - Clean or replace fuel pump
Crankshaft or main bearings wear - Crankshaft or bearings need to be replaced
Valve clearance is improper - Check and adjust
Damaged piston rings or cylinder bore - Change defective components
Engine lacks power
Carburetor is improperly adjusted or clogged - Adjust carburetor properly or service it
Air filter element is plugged - Clean or change air filter
Clogged or damaged fuel pump - Test fuel pump and replace if necessary
Defective ignition - Inspect ignition system and change failed components
Cylinder head gasket is worn - Install new cylinder head gasket
Burned or stuck valves - Service or replace valves
Worn or defective push rod - Install a new push rod
Damaged cylinder block parts - Replace defective parts
Engine using too much gasoline
Throttle did not open fully - Replace or adjust throttle cable
Incorrect carburetor main jet adjustment - Adjust it correctly
Loose or defective spark plug - Change or re-tighten spark plug
Valves are worn, burned or stuck - Service or replace valves
Worn sleeve, piston, or rings - Replace faulty components
Incorrect valve clearance - Adjust valve clearance according to specifications
High oil consumption
Damaged seals or gaskets - Defective components must be replaced
Valve stems and guides are worn - Replace the valves
Piston rings are seized or worn - Have piston rings replaced
Cylinder liner or piston is scuffed - Check liner and piston, replace as required
Plugged breather hose or pipe - Clean or replace

Transmission Troubleshooting
Difficulty shifting gears
Gear shift linkage is rusty or worn - Lubricate or replace the shift linkage
Shift forks are worn or damaged - Change defective shift forks
Worn gear shift mechanism - Replace worn components
Transmission noises
Insufficient fluid supply - Fill the transmission housing with fluid
Transmission oil is contaminated - Fill up with fresh transmission oil
Gears or bearings are worn - Change faulty parts
Transmission jumps out of gear
Gear shift lever is improperly installed or bent - Replace or install shift lever correctly
Worn or damaged gear teeth - Install new gears
Shift rods or shift forks are worn - Replace damaged rods or forks
Transmission slips
Drive belt/shaft is defective or improperly adjusted - Replace belt/shaft or adjust it
Incorrect clutch/brake adjustment or worn clutch/brake - Replace brake/clutch or adjust it
Drive sheave is damaged or worn - Install a new sheave

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission is excessively noisy
Worn or out of adjustment speed control linkage - Adjust or change linkage
Excessive loading - Load needs to be reduced
Fluid is contaminated or fluid level is insufficient - Fill to required level or change the fluid
Worn or defective transmission components - Replace or repair defective components
Hard shifting
Stuck or worn shift linkage - Linkage need to be replaced
Hydrostatic pump is stuck or worn - Repair or replace pump
Misadjusted or faulty transmission shift control components - Replace or adjust as required
Loss of power
Low oil level - Fill up the transmission oil
Drive sheave is damaged or worn - Change sheave
Shift linkage is damaged or unadjusted - Replace or adjust linkage
Bent or unadjusted speed control pedal linkage - Adjust or replace linkage
Transmission leaking
Transmission gaskets or seals are worn - Seals and gaskets need to be replaced
Final drive shaft leaks - Shaft seals need to be changed
Transmission case is cracked - Replace defective case or transmission assembly

Mower Deck Troubleshooting
Excessive mower vibration
Clogged or damaged mower drive sheave - Change or clean sheave
Damaged or loose drive belt - Adjust belt tension or install a new belt
Unbalanced or warped cutting blades - Replace or balance blades
Loose blade bolts tightening - Tighten bolts as required
Discharge chute is constantly plugged
High mowing speed - Use a slower speed
Long grass - Adjust mower to lower cutting height
Engine rpm is too low - Choke is not fully opening
Cutting height is too low - Use a higher cutting height
Drive belt installed improperly - Check drive belt for correct installation
Patches of grass uncut
Clogged mower deck - Clean out the mower deck
Blades are not sharp - Blades need to be sharpened
Blades are worn or damaged - Replace the blades
Fast mowing speed - Need to slow down
Low cutting height - Change cutting height adjustment
Filled bagger - Clean bagger
Blades are scalping the grass
Lawn is not level or bumpy - Roll or level the lawn
Low cutting height - Raise the cutting height
Mowing speed is too high - Use a slower speed
Mower deck is not leveled properly - Level the deck properly
Blades are worn or bent - Replace the blades
Incorrect tire pressure - Correct tire pressure
Uneven cutting
Tires are not correctly inflated - Check and inflate the tires
Mower deck is not leveled properly - Adjust mower deck level properly
Excessive blade dullness - Blades need to be sharpened
Damaged or worn blades - Install new blades
Clogged mower deck - Clean out the mower deck
Damaged mower deck housing - Replace or repair the deck
Mower spindle is faulty or loose - Replace or repair the spindle

Electrical Troubleshooting
Battery cannot be charged
Electrical cable connections are loose or corroded - Clean or tighten connections
Faulty battery terminal clamps - Install new terminal clamps
Battery bad cell - Change the battery
Starter turning slow
Low battery voltage - Battery is drained, recharge it
Battery will not hold charge - Service battery or change it
Terminals are faulty or battery cables are disconnected - Check cables and replace or service terminals
Starter is not cranking
Battery is low or faulty - Recharge or replace battery
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly
Battery capacity is low - Battery is drained, recharge it
Spark plug faulty or incorrectly gapped - Clean and gap or replace
Starter motor or solenoid failing - Change solenoid or repair starter




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