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John Deere LT155 Troubleshooting

John Deere LT155 Engine Troubleshooting

Engine starting problems

Empty gas tank - Fill it up.
Wrong fuel grade - Use correct fuel grade.
Old fuel - Drain fuel and fill up fresh.
Water or air in fuel system - Remove air or water from system.
Spark plug wires are damaged - Install new spark plug wires.
Spark plug not working - Test ignition spark.
Fuel filter is dirty - Fuel filter needs changing.
Brake pedal not depressed - Press the brake pedal.
Carburetor problems - Carburetor diagnostics required.
Test fuel transfer pump output. Check the Valves and Compression System.

Gas engine hard starting

Spark plug malfunction - Test spark and replace as required.
Problems with carburetor adjustment - Adjust as required.
Fuel lines are clogged - Clean fuel system components.
Throttle cable damaged - Change the cable.
Old or incorrect fuel - Pour quality fuel.
Loose or corroded electrical connections - Inspect and change wires if required.
Failing starter - Check the starter and replace defective components.

Engine runs unevenly

Cooling fins blocked - Clean cooling fins.
Electrical connections damaged - Inspect and repair defective contacts.
Incorrect ignition settings - Check ignition and adjust if necessary.
Throttle cable sticks - Check and repair.
Air filter dirty - Replace air cleaner.

Engine runs but misses

Faulty spark plug - Check spark plug wire for wet or deteriorated condition.
Carburetor problems - Test and repair.
Ignition coil not working - Replace defective component.

JD LT155 Engine overheats

Engine runs under excessive load - Reduce the load.
Air intake screen plugged - Clean and wash dirty components.
Engine oil high or too low - Inspect oil level.
Incorrect engine oil viscosity - Change oil.
Inspect crankshaft to main bearing clearance.
Too Fast idle - Adjust carburetor idle mixture screw.

Engine does not idle

Spark plug is loose - Check spark plug gap.
Spark plug malfunction - Test spark and change as required.

Engine knocks

Stale fuel - Use proper gasoline.
Excessive engine load - Reduce loads.
Low oil level - Add engine oil.
Engine speed too low - Adjust carburetor.
Cylinder bore or piston rings are damaged - Check cylinder bore and rings for wear.
Inspect for engine overheats from clogged cooling fins.
Check and adjust crankshaft end play.
Inspect for loose or wear connecting rods.

Engine backfires

Check spark plug and replace if necessary.
Inspect and adjust choke.
Test carburetor, adjust if necessary.
Check and adjust ignition coil air gap.
Inspect inlet and outlet valves.
Check valve clearance, adjust if required.
Inspect flywheel key.

Engine lacks power

Engine temperature too high - Clogged air filter element.
Engine oil overfilled - Remove excess oil.
Defective fuel pump - Repair or replace fuel pump.
Defective governor - Repair or replace governor.
Check carburetor float adjustment.
Test engine compression.

Engine gets too much gas

Choke didn't open fully - Replace choke cable.
Incorrect carburetor adjustment - Checking and adjusting carburetor.

Black exhaust smoke

Air cleaner element clogged - Check and clean.
Throttle not fully engaged - Inspect and adjust throttle.
Check and adjust carburetor float level.

John Deere LT155 Electrical Troubleshooting

Starter does not function

Blown fuse - Installing new fuse.
Terminals are severely corroded and heat up - Clean terminals.
Low battery voltage - Battery charging required.
Ignition lock is damaged - Change switch.
Faulty starter - Install new starter.
Wiring damage - Connect wires.

Battery will not charge

Battery cells defective - Change the battery.
Battery terminals and cables are dirty - Clean or replace cable.

Lighting does not function

Light plug defective.
Replace the lamps.
Wiring short circuit.

JD LT155 Machine Problems

Tractor vibrates too much or rattles excessively

Implements drive belts damaged or worn - Check and change worn belt.
Traction drive belt damage - Fit new belt.
Drive sheaves malfunction - Change if necessary.
Bent cutting blade or no balance - Replace defective blades.

Engine runs but tractor won't move

The parking brake is locked - Disengage the park brake.
Bypass valve pulled out - Set bypass valve to the off position.
Blade becomes loose - Checking blades for loose bolts.
Incorrect blade balance - Check mower blade balancing.
Lack of oil in transmission - Add oil to the transmission.

John Deere LT155 Mower Deck Problems

Clogged discharge chute

Travel speed too fast - Do not use high speed.
Grass too long - Adjusting cutting height.
Grass too wet - Do not use the mower if grass is wet.
Engine runs at low revs - The choke is not fully opening.
Loss of airflow - Adjust to high revs.
Low cutting height - Adjust to higher cutting.
Improper belt installation - Check belt installation.

Uncut grass during operation

Cutting deck clogging - Mower deck needs cleaning.
Damaged blade - Check for blade damage and replace if necessary.
Mower deck is low from ground - Deck leveling required.
Grass bag overfilled - Empty bagger.
Speed is very high - Use slower speed.

Belt Slipping

Sheave is dirty - Clean or replace.
Belt is loose - Inspect and replace worn belt.
Low belt tension - Adjust belt tension.

Mower vibrates

Debris in sheaves or on mower deck - Remove clogging from sheaves or mower deck.
Mower belt or sheave damaged - Replace damaged parts.
Belt or sheaves out of centering - Check and centering.
Blades are not balanced correctly - Balance the blades.

Blades scalping grass

Cutting height incorrect - Check and adjust height.
Mower wheel height incorrect - Adjust rear or front wheel height.
Low tire pressure - Need to inflate tires.
Higher blade speed - Balance mower speed.
Blades are bent - Replace blades.

Uneven Cut

Mower deck low - Adjust and level the deck height.
Low tire inflation - Need to inflate tires.
Wheels not positioned correctly - Adjust rear or front wheel height.
Speed too high - Need to reduce speed.
Blades worn - Install new blade.

JOHN DEERE TRACTORS ATTACHMENTS
420	430	455	790	990
X300	X320	X330	X350	X475
X485	X500	X540	X570	X590
X700	X720	X738	X758	1023E
2025R	2210	2520	3025E	3032E
3038E	3038R	3039R	3046R	3203
3320	3520	4052R	4066R	4100
4105	4115	4200	4310	4320
4400	4410	4520	4600	4720

JD TRACTORS TROUBLESHOOTING
2640	3040	3310	3650	4100
5050D	5090R	5410	6105R	7200R
E130	L111	LA110	LT155	X300R