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John Deere LA100 Tractor Troubleshooting

Gasoline Engine Problems

John Deere LA100 Engine does not start

Fuel tank is empty - Fill gasoline up.
Improper fuel grade - Change gasoline.
Old gasoline - Drain gasoline and change with fresh.
Fuel system clogged - Repair or replace.
Spark plug wires are damaged - Check wires connection.
Spark plug not working - Replace as required.
Dirty fuel filter - Install new filter.
Brake pedal not pushed down - Push the brake pedal down.
Carburetor is not working properly - Inspect and adjust.
Check starter cranking RPM. Test crankcase vacuum.

Gas engine starts hard

Faulty spark plug - Test spark and replace as required.
Problems with carburetor adjustment - Adjust as required.
Dirt in fuel lines - Service required.
Throttle cable is not adjusted correctly - Check and adjust.
Stale or improper gasoline - Drain and add proper gasoline.
Electrical connection problems - Check and replace wires if necessary.
Starter is not working - Check the starter and replace defective components.

JD LA100 Engine runs roughly

Cooling fins blocked - Remove dirt from cooling fins.
Electrical connections damaged - Check and repair damaged connections.
Ignition system problems - Check spark plug and ignition.
Throttle cable sticks - Repair or replace.
Air filter blocked - Clean air filter.

Engine misses

Spark plug failed - Change spark plug.
Carburetor malfunction - Inspect and overhaul.
Ignition coil is damaged - Inspect ignition coil and change if required.

Engine overheats

Engine runs under excessive load - Reduce loads.
Cooling fins or air inlet plugged - Clean and wash dirty components.
Too little or too much oil - Check oil pump for wear or damage.
Poor quality oil - Change engine oil.
Check internal bearing clearance.
Too Fast idle - Adjusting fast idle speed.

Engine does not idle

Spark plug not gapped correctly - Tighten the spark plug correctly.
Spark plug fail - Inspect the spark, change if necessary.

John Deere LA100 Engine knocks

Stale fuel - Use proper gasoline.
Excessive engine load - Reduce loads.
Lack of engine oil - Add engine oil.
Engine runs at low revs - Adjust the speed.
Piston rings and cylinder bore worn - Check cylinder bore and rings for wear.
Check for engine overheating from plugged cooling fins.
Checking and adjusting valve clearance.
Check for worn crankshaft or camshaft bearings.

Engine back-fire

Checking spark plug.
Adjust or change the throttle.
Checking and adjusting carburetor.
Check and adjust ignition coil air gap.
Inspect inlet and outlet valves.
Test valve clearance, adjusting if necessary.
Inspect flywheel key.

Engine lacks power

Engine overheats - Clogged air filter element.
Overfilling engine oil - Excess oil must be drained.
Fuel pump is damage - Repair or replace fuel pump.
Governor is damage - Repair or replace governor.
Inspect carburetor for plugged passages.
Check engine compression.

Engine uses too much fuel

Choke didn't open fully - Inspect throttle cable.
Incorrect carburetor adjustment - Adjust or repair carburetor.

Black exhaust smoke

Air filter element clogged - Clean or change filter.
Throttle is partially engaged - Inspect and adjust throttle.
Check for correct main jet for elevation.

JD LA100 Electrical System Troubleshooting

Starter motor will not turn engine

Main fuse malfunction - Fit new fuse.
Terminals are severely corroded and heat up - Clean contacts.
Low-voltage battery - Charge the battery.
Ignition lock defective - Install new switch.
Starter is not working - Change the starter.
Wiring disconnected - Reconnect wires.

Battery doesn't charge

Dead cell in the battery - Change the battery.
Battery terminals and cables are dirty - Inspect and Clean.

Lights do not work

Light connector defective.
lamp does not work.
Wiring short circuit.

John Deere LA100 Machine Troubleshooting

Excessive tractor vibration

Equipment driven belt worn out - Belt replacement required.
Worn traction drive belt - Installing new driven belt.
Dirt on driven pulley - if required.
Mower blades problem - Change as needed.

Engine runs but tractor won't move

Parking brake holds the tractor - Unlock park brake.
Bypass lever is on - Disengage the bypass valve lever.
Blades loose - Tighten mower blades.
Unbalance in one or both blades - Balance the blades correctly.
Transmission oil too low - Fill transmission with oil.

JD LA100 Lawn Mower Problems

Discharge Chute Clogged

Operating at a faster ground speed - Use slower speed.
Grass has grown too long - try operating a short cutting height.
Wet grass - Wait for the grass to dry.
Low engine speeds - Open choke fully.
Airflow restriction - Check engine speed.
Cutting too low - Choose the correct cutting height.
Incorrect belt installation - Install the belt correctly.

Lawn mower leaving uncut grass

Mower deck clogged - Need to clean the mower deck.
Damaged or worn blade - Install new blade.
Deck level is too low - Leveling the mower deck.
Bagger too full - Empty the grass bag.
Speed is very high - Use slower speed.

Belt slips

Sheave is dirty - Need to clean the pulley.
Belt is damaged - Install new belt.
Belt tension is incorrect - Check belt tension.

John Deere LA100 Mower vibrates

Mower clogged or in pulleys - Clean pulley and deck from debris.
Damaged mower belt or pulleys - Replace defective parts.
Misaligned belt or pulley - Inspect and adjust.
No blade balance adjustment - Blade balance required.

Blades scalp grass

Incorrect height cutting - Set the proper cutting height.
Mower rollers not adjusted improperly - Adjust front or back wheel height.
Tire pressure is uneven - Inflate tires as required.
Higher blade speed - Blade speed required.
Bent mower blades - Install new blades.

Uneven cutting results

Deck too low - Deck leveling required.
Tire pressure uneven - Need to inflate tires.
Wrong wheel position - Adjust front or back wheel height.
Travel speed too high - Operate the mower at low speed.
Mower blades blunt - Check and replace the 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