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John Deere X740 Lawn Tractor Problems

John Deere X740 Engine Troubleshooting

Yanmar diesel engine fails to start

Low-quality diesel fuel - Use quality fuel.
Dirty fuel system - Check and clean.
Fuel filter is dirty - Fit new filter.
Faulty safety switch - Change damaged switch.
Fuel injector pump is not adjusted - Check fuel pump adjustment.
Test fuel transfer pump output. Compression problems.

Engine long starting

Problems with fuel injection pump adjustment - Adjust as required.
Dirt in fuel pipes - Clean fuel system components.
Stale or improper diesel fuel - Fill in correct fuel.
Electrical wiring worn out - Inspect and change.
Starter fault - Check the starter and replace defective components.

Engine runs unevenly

Cooling fins plugged - Remove dirt from cooling fins.
Loose electrical connections - Check and repair damaged connections.
Fuel nozzles are dirty - Clean fuel nozzles.
Air cleaner blocked - Replace air cleaner.

Engine overheating

Engine overloaded - Reduce the load.
Cooling fins or air inlet plugged - Clean dirty components.
Too much or too little oil - Check oil level. Test engine oil pressure.
Low quality engine oil - Change engine oil.
Check internal bearing clearance.
Too Fast idle - Adjust fuel injection pump.

Yanmar engine knocks

Engine overload - Reduce the load.
Low oil level - Add engine oil.
Engine runs at low revs - Adjust the required speed.
Piston rings and cylinder bore worn - Inspect and replace if required.
Check for engine overheating from plugged cooling fins.
Check and adjust crankshaft end play.
Check for loose or worn connecting rods.

Engine lacks power

Engine overheats - Replace air cleaner.
Overfilling engine oil - Remove excess oil.
Diesel fuel pump broken - Test fuel pump output.
Governor not work - Checking and adjusting governor.
Check fuel injection pump adjustment.
Test engine compression.

John Deere X740 Electrical System Troubleshooting

Starter does not run

Blown main fuse - Check and change.
Poor terminal connection - Clean contacts.
Battery not charged - Charge the battery.
Ignition lock problems - Installing new lock.
Damaged starter - Install new starter.
Wiring disconnected - Change wiring.

Battery will not charge

One or several cells defective - Fit new battery.
Bad contact between battery pole and cable - Replace or clean cable.

Lighting does not function

Headlight wire connector disconnected.
lamp defective.
Inspect electrical wires for short- circuit.

John Deere X740 Machine Troubleshooting

Tractor vibrates excessively

Implements drive belts damaged or worn - Check and replace worn belt.
Worn traction drive belt - Install new belt.
Drive pulley malfunction - Change if necessary.
Unbalancing or bending of blades - Tighten and balance blade.

Machine does not move while engine is running

Parking brake is applied - Release the park brake.
Bypass valve lever is engaged - Disengage the bypass valve lever.
Mower blades are loose - Checking blades for loose bolts.
Unbalance in one or both blades - Balance the blades correctly.
Too much or too little oil - Topping up oil.

John Deere X740 Lawn Mower Problems

Plugged discharge chute

Traveling too fast - Use slower speed.
Grass Too Tall - try operating a short cutting height.
Grass too wet - Wait for the grass to dry.
Engine is running at too low speed - Increase engine speed.
Airflow restriction - Check engine rpm.
cut too low - Choose the correct cutting height.
Belt fitted improperly - Fit belt correctly.

Patches of grass uncut

Debris in cutting deck - Deck cleaning required.
Excessive blade wear - Checking for blade fault and change if required.
Deck level is too low - Deck leveling required.
Grass bag overfilled - Empty the grass bag.
Ground speed too fast - Do not use high speed.

Slipping drive belt

Pulley is dirty - Pulley cleaning required.
Drive belt damage - Check and replace belt.
Low belt tension - Install the belt correctly.

Excessive mower vibration

Debris in sheaves or on mower deck - Remove clogging from sheaves or mower deck.
Belt or pulley faulty - Change defective components.
Belt or sheaves out of centering - Check and adjust.
Blades are not balanced correctly - Blade balance required.

Blade strips grass

Cutting height too low - adjust cutting height.
Mower rollers height wrong - Adjust wheel heights correctly.
Low tire inflation - Need to inflate tires.
High blade speed during mowing - Correct blades speed.
Bent blades during operation - Install new blades.

Uneven Cut

Deck too low - Adjust and level the deck height.
Low tire inflation - Check and inflate the tires.
Wheels not positioned correctly - Check the wheel heights.
Gear too high - Use slower speed.
Mower 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