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John Deere L100 Problems

John Deere L100 Engine Troubleshooting

Engine not to start

No gasoline in tank - Add fuel.
Wrong fuel grade - Change gasoline.
Old fuel - Drain gasoline and change with fresh.
Clogged fuel system - Remove clogging.
Spark plug wire is loose or disconnected - Check wires connection.
Faulty spark plug - Check ignition spark.
Fuel filter is clogged - Replace fuel filter.
Brake pedal not pushed down - Push the brake pedal down.
Carburetor problems - Carburetor diagnostics required.
Test fuel transfer pump output. Test crankcase vacuum.

Engine starts hard

Spark plug failed - Test spark and replace as required.
Carburetor not adjusted - Adjust according to instructions.
Clogged fuel pipes - Clean fuel system components.
Choke cable not adjusted properly - Checking and adjusting.
Stale or incorrect gasoline - Pour quality fuel.
Electrical connections are damaged - Checking and replace wiring if necessary.
Starter is not working - Test starter and repair if necessary.

Engine stalling, surging or running rough

Clogged cooling fins - Remove dirt from cooling fins.
Electrical contacts are damaged - Check and restore defective connections.
Ignition system problems - Test ignition and spark plug.
Throttle cable sticking - Repair or change as needed.
Air cleaner blocked - Replace air cleaner.

Engine misses

Faulty spark plug - Inspect spark plug wire.
Carburetor defective or not adjusted - Repair or adjust.
Ignition coil air gap incorrect - Check and adjust ignition coil air gap.

JD L100 Engine overheats

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

Engine does not idle

Spark plug is loose - Adjust spark plug gap.
Spark plug wear - Inspect the spark, change if necessary.

Engine knocks

Stale fuel - Use proper fuel.
Engine overloaded - Reduce the load.
Lack of engine oil - Add engine oil.
Engine speed too low - Adjust the required speed.
Piston rings and cylinder bore worn - Inspect cylinder bore or rings for worn.
Check for engine overheating from plugged cooling fins.
Check and adjust crankshaft end play.
Check for worn crankshaft or camshaft bearings.

Engine back-fire

Checking spark plug.
Adjust or replace choke.
Check and adjust carburetor.
Checking and adjusting ignition coil air gap.
Check for sticking valves.
Inspect and set valve clearance.
Checking flywheel key.

Loss of power

Engine overheating - Clean or replace air filter.
Too much oil in engine - Excess oil must be drained.
Defective fuel pump - Testing fuel pump output.
Defective governor - Checking and adjusting governor.
Check carburetor float adjustment.
Test engine compression.

Engine gets too much gas

Insufficient throttle opening - Replace choke cable.
Carburetor is not working properly - Check and adjust carburetor.

Black exhaust smoke

Air cleaner element plugged - Inspect and clean.
Throttle not fully engaged - Replace or repair choke.
Check and adjust carburetor float level.

John Deere L100 Electrical System Troubleshooting

Starter motor will not turn engine

Blown main fuse - Installing new fuse.
Battery contacts are corroded - Clean connections.
Low-voltage battery - Battery charging required.
Ignition switch defective - Replace the lock.
Faulty starter - Replace or repair.
Wires disconnected - Replace electric wires.

Battery will not charge

Faulty cell in battery - Change the battery.
Battery cables and terminals are dirty - Replace or clean cable.

Lights do not work

Light plug not connected.
Bulbs defective.
Wiring damaged.

JD L100 Machine Problems

The machine vibrates

Equipment driven belt worn out - Check and change worn belt.
Traction drive belt worn - Fit new belt.
Dirt on driven pulley - Clean or replace.
Bent cutting blade or no balance - Change damaged blades.

Tractor doesn't move when engine runs

Parking brake locked - Unlock park brake.
Bypass valve pulled out - Set bypass valve to the off position.
Blades loose - Tighten mower blades.
Blades are unbalanced - Check blades for damage and balance as required.
Lack of oil in transmission - Add transmission oil.

John Deere L100 Lawn Mower Troubleshooting

Clogged discharge chute

Operating at a faster ground speed - Operate the mower at low speed.
Grass too long - try operating a short cutting height.
Wet grass - Do not use the mower if grass is wet.
Engine rpm too low - Increase engine speed.
Loss of airflow - Check engine rpm.
Mower cuts too low - Adjust cutting settings.
Belt is loose - Check belt installation.

Patches of grass uncut

Mower's cutting deck is clogged - Need to clean the mower deck.
Damaged blade - Installing new blade.
Mower deck is low from ground - Checking and adjust deck height.
Grass bag too full - Empty the grass bag.
Speed is very fast - Do not use high speed.

Belt Slipping

Dirt in the pulley - Recommend cleaning the sheaves.
Belt is loose - Install new belt.
Low belt tension - Check belt tension.

The lawn mower vibrates excessively

Debris in pulleys or in mower deck - Clean deck and pulley from debris.
Damaged mower belt or pulleys - Install new components.
Belt or pulleys out of alignment - Inspect and centering.
Incorrect blade balancing - Balance blades correctly.

Blades scalp grass

Cutting height incorrect - Set the proper cutting height.
Mower height wheels not adjusted - Check wheel adjustment.
Insufficient tire pressure - Inflate tires as required.
Faster mower blade speeds - Correct blades speed.
Bent mower blades - Replace blades.

Uneven cutting results

Mower deck not level - Level mower deck.
Tire pressure uneven - Inflate tires as required.
Rollers not positioned properly - Adjust mower deck wheels.
Gear too fast - Operate the mower at low speed.
Blades dull - Sharpen or replace 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