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John Deere X390 Lawn Tractor Problems

John Deere X390 Engine Troubleshooting

Kawasaki engine not starting

No gasoline in tank - Fill it up.
Low-quality gasoline - Use correct gasoline grade.
Old gasoline - Drain fuel and add fresh.
Air or water in fuel system - Remove water or air from fuel system.
Spark plug wires are damaged - Check wires connection.
Faulty spark plug - Inspect ignition spark.
Dirty fuel filter - Install new filter.
Faulty safety switch - Change damaged switch.
Carburetor malfunction - Check and repair as required.
Test fuel transfer pump output. Check the Valves and Compression System.

Engine starts hard

Spark plug worn out - Check the spark and replace defective spark.
Problems with carburetor adjustment - Adjust as required.
Dirt in fuel pipes - Servicing fuel system.
Choke cable damaged - Replacement required.
Old or improper fuel - Drain and add proper gasoline.
Electrical connection problems - Inspect and replace wiring as needed.
Failing starter - Check starter, repair or replace.

Engine stalling, surging or running rough

Cooling fins plugged - Clean cooling fins.
Loose electrical contacts - Inspect and restore defective contacts.
Ignition adjustment lost - Check ignition system and adjust as required.
Throttle cable sticking - Check and replace.
Air cleaner element plugged - Clean or replace the air filter.

Engine misses under load

Spark plug fail - Inspect spark plug wire.
Carburetor defective or not adjusted - Repair or adjust.
Ignition coil not working - Replace defective component.

Kawasaki engine overheats

Engine overloaded - Reduce loads.
Cooling fins or air inlet plugged - Clean dirty components.
Too little or too much oil - Check oil level. Test engine oil pressure.
Poor quality oil - Change engine oil.
Inspect crankshaft to main bearing clearance.
Fast idle speed - Adjust fast idle.

Engine doesn't idle speed

Poor spark plug contact - Tighten the spark plug correctly.
Faulty spark plug - Check the spark and replace defective spark.

Engine knocks

Stale or low octane fuel - Use correct gasoline.
Engine overloaded - Reduce loads.
Low oil level - Add to required level.
Engine is running at low revs - Adjust carburetor as needed.
Cylinder bore and rings are wear - Inspect cylinder bore or rings for worn.
Inspect for engine overheats from clogged cooling fins.
Check and adjust valve clearance.
Check for carbon build-up in combustion chamber.

Engine backfires

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

Kawasaki engine loses power

Engine temperature too high - Change air filter.
High engine oil - Remove excess oil.
Fuel pump is not working properly - Inspect and repair fuel pump.
Defective governor - Repair or replace governor.
Inspect carburetor for plugged passages.
Checking engine compression.

Engine gets too much gas

Choke is not fully open - Replace choke cable.
Carburetor is not adjusted - Adjust or repair carburetor.

Black smoke is emitted during operation

Air cleaner element clogged - Inspect and clean.
Choke not fully engaged - Replace or repair choke.
Check for correct main jet for elevation.

John Deere X390 Electrical System Troubleshooting

Starter does not run

Fuse is defective - Check and replace.
Battery contacts are corroded - Clean terminals.
Battery discharged - Battery charging required.
Ignition switch problems - Replace switch.
Starter is not working - Replace or repair.
Wiring disconnected - Replace electric wires.

Battery does not charge

Battery cells defective - Replace the battery.
Bad contact between battery pole and cable - Replace or clean cable.

Lights do not work

Light plug not connected - Reconnect
lamp does not work.
Short circuit in electrical wires.

John Deere X390 Machine Troubleshooting

Tractor vibrates excessively

Implements drive belts damaged or worn - Check and replace worn belt.
Traction drive belt damage - Inspect and replace traction belt.
Dirt on driven pulley - Clean or replace.
Cutting blade loose or unbalanced - Tighten and balance blade.

Tractor will not move with engine running

Parking brake holds the tractor - Release the park brake.
Bypass valve pulled out - Deactivate the bypass valve.
Blade becomes loose - Check mower blades and fasten as required.
Blades are unbalanced - Check blade balancing.
Transmission oil too low - Fill transmission with oil.

John Deere X390 Mower Deck Problems

Clogged discharge chute

Traveling too fast - Use slower speed.
Too high grass for mowing - Adjusting cutting height.
Wet grass - Do not use the mower if grass is wet.
Low engine speeds - Engine speed must be increased.
Airflow restriction - Check engine speed.
Cutting too low - Choose the correct cutting height.
Belt fitted improperly - Reinstall the belt properly.

Patches of grass uncut

Mower's cutting deck is clogged - Mower deck needs cleaning.
Damaged blade - Installing new blade.
Deck level is too low - Leveling the mower deck.
Bagger too full - Clean grass bag.
Speed is very fast - Choose recommended speed.

Belt slips

Dirt in the sheaves - Need to clean the pulley.
Belt is loose - Fit new belt.
No belt tension required - Install the belt correctly.

Mower vibrates

Debris in pulleys or in mower deck - Remove debris from the pulley or deck.
Mower belt or sheave damaged - Replace worn components.
Belt or sheaves out of centering - Inspect and adjust.
Improper blade balancing - Blades need balancing.

Blades scalp grass

Incorrect height cutting - adjust cutting height.
Mower height wheels not adjusted - Adjust wheel heights correctly.
Insufficient tire pressure - Need to inflate tires.
Faster mower blade speeds - Adjust the speed of blades.
Bent blades during operation - Install new blades.

Uneven cutting results

Mower deck not level - Deck leveling required.
Low tire inflation - Check and inflate the tires.
Incorrect rollers height - Check rollers adjustment.
Ground speed too high - Operate the mower at low speed.
Mower 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