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John Deere 240 Tractor Troubleshooting

Gasoline Engine Problems

John Deere 240 engine doesn't start

No gasoline in tank - Add fuel.
Incorrect fuel grade - Change gasoline.
Old gas - Drain fuel and add fresh.
Clogged fuel system - Remove clogging.
Spark plug defective - Replace if necessary.
Spark plug not working - Check ignition spark.
Plugged fuel filter - Replace fuel filter.
Safety contact for brake pedal defective - Install new part.
Carburetor is clogged - Clean the carburetor.
Check starter cranking RPM. Compression problems.

Gas engine starts hard

Spark plug wear - Inspect the spark, replace if necessary.
Carburetor components worn out - Repair or replace parts.
Fuel lines are clogged - Service required.
Throttle cable damaged - Change the cable.
Stale or improper fuel - Drain and add proper gasoline.
Loose or corroded electrical connections - Check and replace wires if necessary.
Starter fault - Check starter, repair or replace.

Engine runs unevenly

Plugged cooling fins - Clean cooling fins.
Electrical contacts are damaged - Check and restore damaged connections.
Incorrect ignition settings - Test ignition and spark plug.
Choke cable sticking - Check and replace.
Air cleaner element plugged - Replace air cleaner.

JD 240 Engine misses

Spark plug wear - Replace spark plug.
Carburetor malfunction - Inspect and overhaul.
Ignition coil not working - Replace defective component.

Engine overheating

Engine overloaded - Reduce loads.
Cooling fins or air inlet plugged - Clean dirty components.
Too little or too much oil - Inspect oil pump for damage or worn.
Incorrect engine oil viscosity - Change engine oil.
Inspect crankshaft to main bearing clearance.
Fast idle speed - Adjust carburetor idle mixture screw.

Engine will not idle

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

Engine knocks

Stale or low octane fuel - Use proper gasoline.
Excessive engine load - Reduce the load.
Oil level low - Add engine oil.
Engine is running at low revs - Adjust carburetor.
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 carbon build-up in combustion chamber.

John Deere 240 Engine back-fire

Check spark plug and replace if necessary.
Check and adjust the choke.
Test carburetor, adjust if necessary.
Inspect and adjust ignition coil air gap.
Check for sticking valves.
Test valve clearance, adjusting if necessary.
Checking flywheel key.

Loss of power

Engine overheats - Change air filter.
Excess engine oil - Drain excess oil.
Fuel pump is damage - Inspect and repair fuel pump.
Governor not work - Repair or replace governor.
Inspect and repair carburetor.
Test engine compression.

Engine getting too much fuel

Throttle does not open well - Check choke cable.
Carburetor is not working properly - Adjust or repair carburetor.

Emits black smoke

Air filter is dirty or oil soaked - Check and clean.
Choke partially engaged - Inspecting and adjusting choke.
Check oil fill dipstick O-ring seal or cracked cap.

JD 240 Electrical System Troubleshooting

Starter does not function

Blown main fuse - Install new fuse.
Battery contacts are corroded - Inspect and clean contacts.
Low battery voltage - Need to charge the battery.
Ignition switch is damaged - Replace the lock.
Faulty starter - Install new starter.
Wiring damage - Replace electric wires.

Battery doesn't charge

Battery cells fails - Change the battery.
Poor contact between cable and battery pole - Clean or replace cable.

Lights do not work

Light plug disconnected.
lamp defective.
Check wiring for short circuit.

John Deere 240 Machine Problems

The machine vibrates

Equipment drive belts worn out - Check and replace worn belt.
Traction drive belt damage - Inspect and replace traction belt.
Dirt on drive sheaves - Change if necessary.
Unbalancing or bending of blades - Change damaged blades.

The engine is running but tractor is not moving

Parking brake holds the tractor - Unlock park brake.
Bypass valve lever activated - Disengage the bypass valve lever.
Blades loose - Checking blades for loose bolts.
Poor balancing after sharpening - Balance the blades correctly.
Transmission oil is low - Add oil to the transmission.

John Deere 240 Lawnmower Problems

Discharge Chute Clogged

Ground speed too fast - Do not use high speed.
Grass Too Tall - try operating a short cutting height.
Wet grass - Wait until the grass dries.
Low engine speeds - Adjusting carburetor for higher rpm.
Loss of airflow - Check engine rpm.
Low cutting height - Change cutting height.
Belt installed incorrectly - Fit belt correctly.

Uncut grass during operation

Mower deck clogged - Inspect and clean cutting deck.
Damaged or worn blade - Check and replace the blade.
Deck too low - Leveling the mower deck.
Grass bag overfilled - Clean bagger.
Traveling too fast - Do not use high speed.

Belt Slipping

Debris in sheaves - Clean or replace.
Belt is worn out - Inspect and replace worn belt.
Belt tension is incorrect - Adjust belt tension.

The lawn mower vibrates excessively

Debris in mower deck or in pulleys - Clean pulley and deck from debris.
Mower belt or sheave damaged - Change worn parts.
Belt or sheaves no adjustment - Inspect and align.
Blades out of balance - Blade balance required.

Blades scalping grass

Incorrect height cutting - Set the proper cutting height.
Mower rollers height wrong - Adjust mower deck wheels.
Low tire pressure - Increase tire pressure.
Higher blade speed - Adjust the speed of blades.
Bent mower blades - Replace blades.

Uneven Cut

Mower deck not leveled properly - Deck leveling required.
Insufficient tire pressure - Tire pressure required.
Incorrect rollers height - Check the rollers heights.
Gear too high - Use slower 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