________________________________________________________________________________

John Deere X720 Lawn Tractor Problems

John Deere X720 Engine Troubleshooting

Kawasaki engine fails to start

Gas tank is empty - Add gasoline.
Improper fuel grade - Change fuel.
Old fuel - Drain gasoline and fill fresh up.
Dirty fuel system - Check and clean.
Plug connection defective - Replace if necessary.
Faulty spark plug - Clean, adjust gap or replace.
Clogged fuel filter - Fuel filter needs changing.
Faulty safety switch - Change damaged switch.
Carburetor problems - Carburetor diagnostics required.
Check and adjust governor linkage. Compression problems.

Engine hard starting

Spark plug worn out - Test spark and change as required.
Carburetor incorrectly set - Set carb correctly.
Fuel pipes are clogged - Clean the system carefully.
Throttle cable damaged - Change the cable.
Old or improper fuel - Pour quality fuel.
Loose or corroded electrical connections - Check and replace wires if necessary.
Starter problems - Test starter and repair if necessary.

Engine runs unevenly

Cooling fins are clogged - Remove dirt from cooling fins.
Electrical connections damaged - Check and replace defective connections.
Ignition system problems - Check ignition and adjust if necessary.
Choke cable sticks - Check and replace.
Air filter element clogged - Replace air cleaner.

Engine misses

Faulty spark plug - Check spark plug wire for wet or deteriorated condition.
Carburetor defective or not adjusted - Repair or adjust.
Ignition coil is damaged - Inspect ignition coil and change if required.

Kawasaki engine overheats

Engine runs under excessive load - Reduce the load.
Air inlet or cooling fins blocked - Clean dirty components.
Engine oil low or too high - Check oil level. Test engine oil pressure.
Improper engine oil viscosity - Change oil.
Check internal bearing clearance.
Idle speed problems - Adjust fast idle.

Engine doesn't idle speed

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

Engine knocks

Stale gasoline - Use correct fuel.
Engine overloaded - Reduce loads.
Lack of engine oil - add oil as required.
Low engine speed - Adjust carburetor as needed.
Cylinder bore and rings are wear - Replace damaged parts.
Check for engine overheating from plugged cooling fins.
Inspect and adjusting crankshaft end play.
Inspect for loose or wear connecting rods.

Engine back-fire

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

Kawasaki engine loses power

Engine overheats - Change air filter.
Too much oil in engine - Excess oil must be drained.
Defective fuel pump - Inspect and repair fuel pump.
Governor is damage - Checking and adjusting governor.
Inspect and repair carburetor.
Test engine compression.

Excessive Fuel Consumption

Throttle did not open fully - Check throttle cable.
Carburetor is not working properly - Check and adjust carburetor.

Emits black smoke

Air filter is dirty or oil soaked - Inspect and clean.
Throttle is partially engaged - Inspecting and adjusting throttle.
Checking and adjusting carburetor float level.

John Deere X720 Electrical System Troubleshooting

Starter doesn't work or will not turn engine

Blown fuse - Installing new fuse.
Poor terminal connection - Clean terminals.
Battery is discharged - Battery charging required.
Ignition lock problems - Change switch.
Faulty starter - Change the starter.
Electrical wires are damaged - Connect wires.

Battery doesn't charge

Battery cells defective - Install new battery.
Battery terminals and cables are dirty - Clean or replace cable.

No Lights work

Light plug defective.
Lamp is not working - Replace the lamp.
Short circuit in electrical wires.

John Deere X720 Machine Troubleshooting

Excessive tractor vibration

Implements drive belts damaged or worn - Inspect and change damaged belt.
Traction drive belt damage - Fit new belt.
Dirt on drive sheaves - Clean or replace.
Cutting blade loose or unbalanced - Replace damaged blades.

Tractor doesn't move when engine runs

The parking brake is locked - Release the park brake.
Bypass valve pulled out - Deactivate the bypass valve.
Mower blade could be loose - Checking blades for loose bolts.
Incorrect blade balance - Check mower blade balancing.
Low transmission oil - Add transmission oil.

John Deere X720 Mower Deck Problems

Plugged discharge chute

Operating at a faster ground speed - Do not use high speed.
Grass Too Tall - Adjust the mower to a lower cutting height.
Grass too wet - Don't mow while wet grass.
Engine rpm too low - Adjusting carburetor for higher rpm.
Loss of airflow - Adjust to high revs.
Low cutting height - Choose the correct cutting height.
Belt fitted improperly - Reinstall the belt properly.

Lawn mower leaving uncut grass

Cutting deck clogging - Clean mower deck.
Excessive blade wear - Check for blade damage and replace if necessary.
Deck level is too low - Checking and adjust deck height.
Bagger too full - Clean bagger.
Traveling too fast - Use slower speed.

Belt slips

Debris in pulleys - Recommend cleaning the sheaves.
Belt is worn out - Inspect and replace worn belt.
Low belt tension - Check belt tension.

Too much mower vibration

Mower clogged or in pulleys - Clean deck and pulley from debris.
Worn belt or pulley - Install new components.
Pulley or belt out of alignment - Check and align.
Blades are not balanced correctly - Balance blades properly.

Blades scalping grass

Cutting too low - adjust cutting height.
Mower height wheels not adjusted - Adjust rear or front wheel height.
Low tire inflation - Increase tire pressure.
High blade speed during mowing - Blade speed required.
Bent blades during operation - Install new blades.

Uneven Cut

Mower deck not level - Checking and adjust deck height.
Low tire inflation - Increase tire pressure.
Wrong wheel position - Adjust mower deck wheels.
Ground speed too fast - Use slower speed.
Mower blades blunt - Check for blade damage and replace if necessary.

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