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