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John Deere X758 Lawn Tractor Problems

John Deere X758 Engine Problems

Yanmar diesel engine starting problems

Stale fuel - Drain fuel and replace with fresh fuel.
Dirt and debris in fuel system - Remove debris and dirt.
Fuel filter is plugged - Replace fuel filter.
Brake pedal not depressed - Press the brake pedal.
Fuel injection pump malfunction - Check and repair as required.
Test fuel transfer pump output. Check and adjust valve clearance.

Engine is difficult to start

Problems with fuel injection pump adjustment - Adjust as required.
Fuel lines are clogged - Remove clogging from fuel pipes.
Stale or improper fuel - Pour quality fuel.
Electrical connections are damaged - Checking and replace wiring if necessary.
Starter fault - Inspect the starter and change defective parts.

Engine runs roughly

Cooling fins blocked - Remove dirt from cooling fins.
Electrical contacts are damaged - Inspect and repair defective contacts.
Idle speed adjust incorrect - Test idling and set up.
Air filter element clogged - Clean air filter.

Yanmar diesel engine overheating

Excessive engine load - Reduce loads.
Cooling fins or air inlet plugged - Clean and wash dirty components.
Engine oil low or too high - Check oil level. Test engine oil pressure.
Poor quality oil - Change engine oil.
Check internal bearing clearance.
Too Fast idle - Adjust fast idle.

Engine knocking

Excessive engine load - Reduce loads.
Lack of engine oil - add oil as required.
Engine speed too low - Adjust fuel injection pump.
Cylinder bore and rings are wear - Inspect and replace if required.
Check for engine overheating from plugged cooling fins.
Inspect and adjusting crankshaft end play.

Loss of power

Engine overheats - Check air cleaner for plugged condition.
Excess engine oil - Excess oil needs to be drained.
Diesel fuel pump is damage - Test fuel pump output.
Governor not work - Repair or replace governor.
Check fuel injection pump adjustment.
Test engine compression.

John Deere X758 Electrical System Troubleshooting

Starter motor will not turn engine

Blown main fuse - Fit new fuse.
Battery contacts are corroded - Clean contacts.
Low battery voltage - Charge the battery.
Starter is damaged - Change the starter.
Electrical wires are damaged - Change wiring.

Battery will not charge

Battery cells fails - Change the battery.
Battery terminals and cables are dirty - Clean or change cable.

No Lights work

Light plug not connected - Reconnect.
Lamp is not working - Replace the lamp.
Wiring damaged - Check and replace.

John Deere X758 Mechanical Troubleshooting

The machine vibrates

Attachment driven belt worn or damaged - Inspect and change damaged belt.
Worn traction drive belt - Installing new driven belt.
Drive sheaves malfunction - Clean the sheaves.
Blades bent or out of balance - Replace damaged blades.

The engine is running but tractor is not moving

Parking brake locked - Release the parking brake.
Bypass lever is on - Disengage the bypass valve lever.
Blades loose - Tighten mower blades.
Incorrect blade balancing - Check mower blade balancing.
Transmission oil too low - Check transmission oil lever.

John Deere X758 Lawn Mower Problems

Discharge Chute Clogged

Speed too high - Choose recommended speed.
Grass too long - Use a shorter cutting height.
Wet grass - Don't mow while wet grass.
Low engine speeds - Open throttle wide.
Restricted air flow - Set higher revs.
Low cutting height - Change cutting height.
Belt installed improperly - Reinstall the belt properly.

Streaking of uncut grass

Clog in discharge area - Deck cleaning required.
Defective blade - Checking for blade fault and change if required.
Deck too low - Deck leveling required.
Grass bag overfilled - Clean bagger.
Travel speed too fast - Choose recommended speed.

Belt slips

Debris in sheaves - Need to clean the pulley.
Belt is loose - Fit new belt.
Belt tension problems - Belt tension needs to be adjusted.

Excessive mower vibration

Mower clogged or in pulleys - Clean pulley and deck from debris.
Worn pulley or belt - Replace defective parts.
Pulley or belt out of alignment - Inspect and align.
Blades out of balance - Blade balance required.

Blades scalping grass

Cutting too low - Set the proper cutting height.
Mower wheels not adjusted correctly - Check the wheel heights.
Insufficient tire pressure - Need to inflate tires.
Higher blade speed - Correct blades speed.
Blades are bent - Replace blades.

Uneven Cut

Mower deck not level - Checking and adjust deck height.
Insufficient tire pressure - Check and inflate the tires.
Wheels not positioned correctly - Check the rollers heights.
Speed too high - Choose recommended speed.
Blades worn - 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