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John Deere X749 Lawn Tractor Problems

John Deere X749 Engine Troubleshooting

Yanmar engine not to start

Low-quality fuel - Use correct fuel grade.
Dirt and debris in fuel system - Remove debris and dirt.
Fuel filter is clogged - Fit new filter.
Faulty safety switch - Change damaged switch.
Fuel injection pump is not working properly - Inspect and adjust.
Inspect and adjust engine. Test crankcase vacuum.

Engine hard starting

Fuel injection pump is dirty - Wash, clean and adjust.
Fuel lines are clogged - Clean fuel system components.
Stale or incorrect fuel - Drain and add quality fuel.
Electrical wires are damaged - Check and replace wires if necessary.
Starter fault - Check starter, repair or replace.

Engine runs unevenly

Cooling fins are clogged - Clean and wash cooling fins.
Loose electrical connections - Inspect and replace defective contacts.
Fuel injectors are dirty - Clean fuel injectors
Air cleaner blocked - Clean air filter.

Yanmar diesel engine overheating

Engine runs under excessive load - Reduce loads.
Air intake screen clogged - Clean and wash dirty components.
Engine oil low or too high - Check oil level. Test engine oil pressure.
Incorrect engine oil viscosity - Change engine oil.
Check connecting rod to crankshaft bearing clearance.
Too Fast idle - Adjust fuel injection pump.

Engine knocking

Engine overloaded - Reduce loads.
Lack of engine oil - add oil as required.
Engine is running at low revs - Adjust fuel injection pump.
Cylinder bore and rings worn out - Replace damaged parts.
Check for engine overheating from plugged cooling fins.
Check and adjust valve clearance.
Inspect for loose or wear connecting rods.

Engine loses power

Engine overheats - Replace air cleaner.
Overfilling engine oil - Drain excess oil.
Diesel fuel pump is damage - Repair or replace fuel pump.
Governor is damage - Inspect and repair governor.
Inspect fuel injection pump for plugged nozzles.
Checking engine compression.

John Deere X749 Electrical System Troubleshooting

Starter does not run

Blown main fuse - Check and replace.
Battery contacts are corroded - Clean connections.
Low-voltage battery - Battery charging required.
Ignition lock defective - Replace switch.
Starter fault - Replace or repair.
Wires disconnected - Replace electric wires.

Battery does not charge

Faulty cell in battery - Change the battery.
Bad contact between battery pole and cable - Replace or clean cable.

No Lights work

Light plug not connected - Reconnect
Check light bulbs.
Short-circuit in cable.

John Deere X749 Machine Troubleshooting

Tractor vibrates too much or rattles excessively

Equipment drive belts worn out - Inspect and replace damaged belt.
Worn traction drive belt - Check and replace belt.
Dirt on driven pulley - Clean if required.
Blades bent or out of balance - Replace defective blades.

Tractor doesn't move when engine runs

Parking brake blocks the tractor - Unlock park brake.
Bypass valve lever activated - Set bypass valve to the off position.
Blade becomes loose - Checking blades for loose bolts.
Poor blade balancing - Inspect the blades and balance if necessary.
Transmission oil is insufficient - Add transmission oil.

John Deere X749 Lawn Mower Problems

Discharge Chute Plugged

Lawn mower is driving too fast - Do not use high speed.
Grass has grown too long - Use a shorter cutting height.
The grass is wet - Do not mow when grass is wet.
Engine runs at low revs - The throttle is not fully open.
Restricted air flow - Adjust to high revs.
Low cutting height - Adjust cutting settings.
Belt fitted improperly - Check belt installation.

Streaking of uncut grass

Mower deck clogged - Deck cleaning required.
Excessive blade wear - Inspect and fit new blade if required.
Deck too low - Checking and adjust deck height.
Grass bag overfilled - Clean grass bag.
Traveling too fast - Choose recommended speed.

Belt Slipping

Debris in sheaves - Pulley cleaning required.
Drive belt damage - Check and replace belt.
Low belt tension - Check belt tension.

Too much mower vibration

Mower deck clogged or in sheaves - Remove debris from the pulley or deck.
Worn pulley or belt - Replace defective components.
Pulleys or belt misaligned - Check and adjust.
Blades are not balanced correctly - Balance blades properly.

Blades scalping grass

Cutting height incorrect - Raise cutting height.
Mower rollers height wrong - Check the wheel heights.
Low tire pressure - Inflate tires as required.
Higher blade speed - Adjust the speed of blades.
Bent mower blades - Remove bent blade and fit new one.

Uneven cutting results

Mower deck low - Leveling the mower deck.
Insufficient tire pressure - Check and inflate the tires.
Incorrect rollers height - Adjust wheel heights correctly.
Speed too high - Use slower 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