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John Deere LA140 Tractor Problems

Gasoline Engine Troubleshooting

John Deere LA140 Engine starting problems

Fuel tank is empty - Fill it up.
Low-quality gasoline - Use quality fuel.
Stale gasoline - Drain gasoline and change with fresh.
Water or air in fuel system - Remove air or water from system.
Spark plug wire is loose or disconnected - Check the spark plug wires.
Faulty spark plug - Inspect ignition spark.
Dirty fuel filter - Fuel filter needs to be replaced.
Defective safety switch - Replace if required.
Carburetor problems - Carburetor diagnostics required.
Check and adjust governor linkage. Check and adjust valve clearance.

Gas engine hard to start

Spark plug fail - Inspect the spark, change if necessary.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Clogged fuel pipes - Remove clogging from fuel pipes.
Worn throttle cable - Replace as required.
Old or improper fuel - Fill in proper gasoline.
Loose or corroded electrical connections - Checking and replace.
Starter fault - Check starter, repair or replace.

Engine runs unevenly

Cooling fins are clogged - Clean cooling fins.
Electrical contacts are damaged - Check and restore damaged connections.
Ignition adjust incorrect - Check ignition system and adjust as required.
Choke cable sticking - Check and replace.
Air filter element clogged - Clean or replace the air filter.

JD LA140 Engine misses under load

Spark plug failed - Test spark plug.
Carburetor defective or not adjusted - Repair or adjust.
Ignition coil air gap incorrect - Check and adjust ignition coil air gap.

Engine overheats

Engine runs under excessive load - Reduce the load.
Air intake screen plugged - Clean clogged components.
Engine oil low or too high - Checking oil level and oil pressure.
Low quality engine oil - Change oil.
Check connecting rod to crankshaft bearing clearance.
Fast idle speed - Adjust carburetor for slower idle speed.

Engine doesn't idle speed

Poor spark plug contact - Check tightness of spark plug.
Spark plug failed - Inspect the spark, replace if necessary.

Engine knocks

Stale gasoline - Use proper gasoline.
Engine overloaded - Reduce loads.
Low oil level - Add to required level.
Low engine speed - Adjust the required speed.
Cylinder bore and rings worn out - Replace defective components.
Inspect for engine overheats from clogged cooling fins.
Check and adjust valve clearance.
Checking for wear crankshaft or camshaft bearings.

John Deere LA140 Engine backfires

Checking spark plug.
Adjust or replace throttle.
Adjust carburetor idle mixture screw.
Check and adjust ignition coil air gap.
Inspect for sticking valves.
Check valve clearance, adjust if required.
Inspect flywheel key.

Loss of power

Engine overheats - Check air cleaner for plugged condition.
Too much oil in engine - Excess oil needs to be drained.
Fuel pump is not working properly - Repair or replace fuel pump.
Governor problems - Inspect and repair governor.
Check carburetor float adjustment.
Check engine compression.

Engine using too much gasoline

Insufficient throttle opening - Check throttle cable.
Carburetor malfunction - Adjust carburetor.

Black exhaust smoke

Air cleaner is dirty or oiled - Clean or replace filter.
Choke not fully engaged - Check and repair throttle.
Check for correct main jet for elevation.

JD LA140 Electrical System Troubleshooting

Starter does not function

Main fuse defective - Check and replace.
Poor terminal connection - Clean terminals.
Weak battery - Need to charge the battery.
Ignition switch defective - Installing new lock.
Starter is damaged - Replace or repair.
Electrical wires are damaged - Connect wires.

Battery will not charge

Battery cells defective - Change the battery.
Battery terminals and cables are dirty - Replace or clean cable.

No Lights work

Light plug defective.
Replace the lamps.
Short-circuit in cable.

John Deere LA140 Machine Problems

Excessive tractor vibration

Implements drive belts damaged or worn - Inspect and replace damaged belt.
Traction drive belt damage - Installing new driven belt.
Drive pulley malfunction - Replace if necessary.
Blades bent or out of balance - Change damaged blades.

The engine is running but tractor is not moving

Parking brake locked - Release the parking brake.
Bypass lever is on - Set bypass valve to the off position.
Mower blade could be loose - Tighten mower blades.
Incorrect blade balancing - Check blades for damage and balance as required.
Too little transmission oil - Pour oil as required.

John Deere LA140 Mower Deck Troubleshooting

Discharge Chute Plugged

Operating at a faster ground speed - Operate the mower at low speed.
High grass - try operating a short cutting height.
Wet grass - Wait until later to cut.
Engine is running at too low speed - Adjusting carburetor for higher rpm.
Lack of air flow - Adjust to high revs.
Mower deck set to low cutting - Choose the correct cutting height.
Belt is loose - Reinstall the belt properly.

Uncut grass during operation

Cutting deck clogging - Check cutting deck and clean if necessary.
Blades dull or damaged - Install new blade.
Mower deck low - Leveling the mower deck.
Grass bag too full - Empty bagger.
Speed is very high - Choose recommended speed.

Slipping drive belt

Dirt in the sheaves - Clean or replace.
Drive belt damage - Check and replace belt.
Poor belt tension - Check belt tension.

The lawn mower vibrates excessively

Debris in sheaves or on mower deck - Remove clogging from sheaves or mower deck.
Belt or sheaves faulty - Fit new components.
Belt or sheaves no adjustment - Check and align.
Improper blade balancing - Balance blades properly.

Blades scalping grass

Cutting too low - Check and adjust height.
Mower rollers height wrong - Check the wheel heights.
Insufficient tire pressure - Inflate tires as required.
Faster mower blade speeds - Correct blades speed.
Blades are bent - Install new blades.

Uneven Cut

Deck too low - Leveling the mower deck.
Tire pressure uneven - Inflate tires as required.
Wrong wheel position - Adjust front or back wheel height.
Ground speed too fast - Choose recommended speed.
Blades worn - Installing 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