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John Deere S240 Troubleshooting

John Deere S240 Engine Problems

Tractor engine doesn't start

Gas tank is empty - Add gasoline.
Incorrect fuel grade - Use correct fuel grade.
Stale gas - Drain fuel and fill up fresh.
Dirty fuel lines - Inspect and clean.
Spark plug wires are damaged - Replace if necessary.
Spark plug damaged - Spark plugs need to be replaced.
Clogged fuel filter - Change fuel filter.
Defective safety switch - Replace if required.
Carburetor malfunction - Check and repair as required.
Check starter cranking RPM. Test compression.

Engine hard starting

Spark plug worn out - Inspect the spark, replace if necessary.
Carburetor not adjusted - Adjust according to instructions.
Clogged fuel lines - Clean fuel system components.
Throttle cable worn - Install new throttle cable.
Old or incorrect fuel - Fill in correct fuel.
Electrical wiring worn out - Checking and replace wiring if necessary.
Starter fault - Test starter and repair if necessary.

Rough running engine

Plugged cooling fins - Clean and wash cooling fins.
Electrical contacts are damaged - Inspect and repair defective contacts.
Incorrect ignition settings - Check ignition and adjust if necessary.
Throttle cable sticks - Repair or change as needed.
Air filter element clogged - Replace air cleaner.

Engine runs but misses

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

Engine overheating

Excessive engine load - Reduce loads.
Cooling fins or air inlet plugged - Clean dirty components.
Engine oil high or too low - Inspect oil level.
Low quality engine oil - Change engine oil.
Check connecting rod to crankshaft bearing clearance.
Too Fast idle - Adjust carburetor idle mixture screw.

Engine will not idle

Poor spark plug contact - Check tightness of spark plug.
Spark plug fail - Inspect the spark, change if necessary.

JD S240 Engine knocks

Stale fuel - Change gasoline.
Excessive engine load - Reduce the load.
Oil level low - Check oil level and add if necessary.
Engine is running at low revs - Adjust the speed.
Cylinder bore and rings worn out - Inspect cylinder bore or rings for worn.
Inspect for engine overheats from clogged cooling fins.
Checking and adjusting valve clearance.
Check for carbon build-up in combustion chamber.

Engine backfires

Check spark plug and replace if necessary.
Inspect and adjust choke.
Adjust carburetor idle mixture screw.
Check and adjust ignition coil air gap.
Check for sticking valves.
Test valve clearance, adjusting if necessary.
Inspecting flywheel key.

Engine does not develop full power

Engine overheats - Check air cleaner for plugged condition.
High engine oil - Excess oil needs to be drained.
Faulty fuel pump - Inspect and repair fuel pump.
Governor problems - Inspect and adjust governor.
Check carburetor float adjustment.
Check engine compression.

Excessive fuel consumption

Insufficient throttle opening - Replace throttle cable.
Incorrect carburetor adjustment - Check carburetor float adjustment.

Black smoke is emitted during operation

Air cleaner element plugged - Inspect and clean.
Choke partially engaged - Check and repair throttle.
Check oil fill dipstick O-ring seal or cracked cap.

JD S240 Electrical System Troubleshooting

Starter does not function

Fuse is defective - Install new fuse.
Battery contacts are corroded - Clean contacts.
Battery not charged - Battery charging required.
Ignition switch problems - Installing new lock.
Starter fault - Install new starter.
Wiring disconnected - Change wiring.

Battery will not charge

One or several cells defective - Install new battery.
Battery cables and terminals are dirty - Check and Clean.

Lights do not work

Connection/disconnection level in wrong position.
Replace light bulbs.
Wiring damaged.

John Deere S240 Machine Troubleshooting

Tractor vibrates excessively

Implements drive belts damaged or worn - Check and replace worn belt.
Worn traction drive belt - Fit new belt.
Drive pulley malfunction - if required.
Mower blades problem - Balance the blades or replace.

Tractor will not move with engine running

The parking brake is locked - Unlock park brake.
Bypass valve lever activated - Set bypass valve to the off position.
Loose lawnmower blades - Check mower blades and fasten as required.
Blades are unbalanced - Check blades for damage and balance as required.
Too little transmission oil - Fill transmission with oil.

John Deere S240 Mower Deck Problems

Clogged discharge chute

Traveling too fast - Do not use high speed.
Grass has grown too long - Use a shorter cutting height.
Wet grass - Wait until the grass dries.
Engine rpm too low - Increase engine rpm.
Restricted air flow - Set higher revs.
Low cutting height - Use higher cutting.
Incorrect belt installation - Reinstall the belt properly.

Uncut grass during operation

Clog in discharge area - Clean mower deck.
Excessive blade wear - Check and replace the blade.
Mower deck is low from ground - Leveling the mower deck.
Grass bagger overfilled - Empty the grass bag.
Speed is very fast - Choose recommended speed.

Belt Slipping

Debris in pulleys - Recommend cleaning the sheaves.
Worn belt - Check and replace belt.
Belt tension is incorrect - Adjust belt tension.

The lawn mower vibrates excessively

Mower clogged or in pulleys - Clean sheave and deck from clogging.
Worn belt or sheave - Replace worn components.
Belt or pulleys no adjustment - Inspect and adjust.
No blade balance adjustment - Adjust blade balance.

Blades scalping grass

Cutting height incorrect - Raise cutting height.
Mower rollers height wrong - Check wheel adjustment.
Tires inflated insufficient - Check and inflate the tires.
High blade speed during mowing - Correct blades speed.
Blades are bent - Replace blades.

Uneven cutting results

Mower deck low - Leveling the mower deck.
Low tire pressure - Tire pressure required.
Incorrect wheel height - Check rollers adjustment.
Ground speed too fast - Need to reduce speed.
Blades dull - Inspect and fit new blade if required.

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