________________________________________________________________________________

John Deere X520 Lawn Tractor Problems

John Deere X520 Engine Troubleshooting

Kawasaki engine not to start

Fuel tank is empty - Fill it up.
Low-quality gasoline - Change gasoline.
Old gas - Drain fuel and replace with fresh fuel.
Dirt and debris in fuel system - Remove debris and dirt.
Spark plug wire is loose or disconnected - Install new spark plug wires.
Faulty spark plug - Change as required.
Fuel filter is plugged - Fuel filter needs to be replaced.
Faulty safety switch - Change damaged switch.
Carburetor malfunction - Check and repair as required.
Inspect starter cranking speed RPM. Test compression.

Gas engine hard starting

Faulty spark plug - Test spark and change as required.
Carburetor not adjusted - Adjust according to instructions.
Dirt in fuel lines - Servicing fuel system.
Choke cable not adjusted properly - Checking and adjusting.
Old or incorrect fuel - Fill in proper gasoline.
Electrical connection problems - Check and replace wires if necessary.
Starter fault - Check the starter and replace defective components.

Rough running engine

Cooling fins are clogged - Remove dirt from cooling fins.
Electrical contacts are damaged - Check and repair damaged connections.
Ignition adjust incorrect - Test ignition and spark plug.
Choke cable sticking - Check and replace.
Air cleaner dirty - Replace air cleaner.

Engine misses

Spark plug wear - Change spark plug.
Carburetor is not adjusted correctly - Adjust carburetor as required.
Ignition coil is damaged - Inspect ignition coil and change if required.

Kawasaki engine overheating

Engine runs under excessive load - Reduce loads.
Air intake screen blocked - Clean clogged components.
Too much or too little oil - Inspect oil pump for damage or worn.
Low quality engine oil - Change engine oil.
Check internal bearing clearance.
Fast idle speed - Adjust carburetor for slower idle speed.

Engine doesn't idle speed

Poor spark plug contact - Check tightness of spark plug.
Faulty spark plug - Inspect the spark, replace if necessary.

Engine knocks

Low octane fuel - Change gasoline.
Engine overloaded - Reduce loads.
Oil level low - Add engine oil.
Low engine speed - Adjust carburetor as needed.
Cylinder bore and rings worn out - Inspect and replace if required.
Inspect for engine overheats from clogged cooling fins.
Inspect and adjusting crankshaft end play.
Check for carbon build-up in combustion chamber.

Engine backfires

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

Kawasaki engine loses power

Engine overheats - Change air filter.
Excess engine oil - Remove excess oil.
Faulty fuel pump - Testing fuel pump output.
Governor problems - Inspect and adjust governor.
Inspect and repair carburetor.
Check engine compression.

Engine gets too much gas

Choke is not fully open - Adjust throttle cable.
Carburetor problems - Checking and adjusting carburetor.

Emits black smoke

Air cleaner element plugged - Clean or change filter.
Choke partially engaged - Inspecting and adjusting throttle.
Inspect carburetor needle valve and seat for wear or damage.

John Deere X520 Electrical System Troubleshooting

Starter does not function

Main fuse defective - Check and change.
Poor terminal connection - Clean terminals.
Battery discharged - Need to charge the battery.
Ignition lock is damaged - Change the lock.
Damaged starter - Install new starter.
Wiring damage - Change wiring.

Battery will not charge

One or more battery cells dead - Install new battery.
Battery terminals and cables are dirty - Inspect and Clean.

No Lights work

Connection/disconnection level in wrong position.
Check light bulbs.
Short-circuit in cable.

John Deere X520 Machine Troubleshooting

The machine vibrates

Attachment driven belt worn or damaged - Belt replacement required.
Worn traction drive belt - Inspect and replace traction belt.
Dirt on drive sheaves - Clean or replace.
Blades bent or out of balance - Replace damaged blades.

Engine runs but tractor won't move

parking brake blocks the tractor - Release the parking brake.
Bypass valve lever in the push position - Set bypass valve to the off position.
Blade becomes loose - Tighten mower blades.
Incorrect blade balance - Check blades for damage and balance as required.
Transmission oil is low - Fill transmission with oil.

John Deere X520 Lawn Mower Problems

Discharge Chute Plugged

Speed too high - Operate the mower at low speed.
Grass has grown too long - Adjust cutting height.
The grass is wet - Don't mow while wet grass.
Engine rpm reduced - Open choke fully.
Airflow restriction - Set higher revs.
Mower deck set to low cutting - Adjust to higher cutting.
Belt is loose - Fit belt correctly.

Lawn mower leaving uncut grass

Mower's cutting deck is clogged - Clean mower deck.
Damaged blade - Inspect and fit new blade if required.
Mower deck is low from ground - Adjust and level the deck height.
Grass bag overfilled - Clean bagger.
Travel speed too fast - Need to reduce speed.

Belt slips

Dirt in the pulley - Clean or replace.
Drive belt wear - Inspect and replace worn belt.
Low belt tension - Check and adjusting belt tension.

Mower vibrates

Debris in pulleys or in mower deck - Clean deck and pulley from debris.
Worn sheaves or belt - Change defective parts.
Belt or sheaves out of centering - Check and adjust.
No blade balance adjustment - Blade balance required.

Blades scalping grass

Cutting too low - adjust cutting height.
Mower rollers height wrong - Check the wheel heights.
Low tire inflation - Need to inflate tires.
Higher blade speed - Adjust the speed of blades.
Bent mower blades - Install new blades.

Uneven Cut

Deck too low - Checking and adjust deck height.
Low tire pressure - Tire pressure required.
Wrong wheel position - Adjust front or back wheel height.
Travel speed too high - Choose recommended speed.
Blades worn - 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