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John Deere 4640 Problem - Repair methods

The day before I found out a failure on my John Deere 4640. Diesel motor can not turn over. Tell me please what kind of failure?

Fuel type is incorrect. High-pressure fuel pump is damaged. Check and repair. Wrong fuel pump timing. Adjust as required.

Somebody help me why my steering wheel rotates very easy? What do I need to do to correct the situation?

The minimum oil level - It is required to add oil. This is a steering cylinder malfunction - Make a replacement. Defect in the power steering pump - Check the steering pump.

I purchased a JD 4640 in march. Now there is damage. Diesel motor won't start. Could anyone help me determine a source of failure?

Starter does not work - Replace or repair. Fuel pipes are contaminated - Clean and wash. Dirty fuel filter element - Install new filter. Worn piston rings - Refit a new set of piston rings.

I use the same model. Yesterday I saw steering wheel turns hard. Explain to me what is problem?

Low hydraulic oil level in tank. Fill the tank. Leak in hydraulic connections. Eliminate a defect. Steering pump is defective. Replace the pump. Power steering is damaged. Replace it.

4640 tractor question. Diesel engine starts hard. Help me please recognize the reason of problem. What do I need to check?

Clogging in air filter/cleaner. Cold start system worked incorrectly. Piston rings are wear or deformed. Injection pump drive shaft is defective. Water in fuel. Fuel too heavy at low temperature.

JD 4640 engine failures. Engine hard to start sometimes. How can i fix the breakdown?

Clogging in fuel tank vent. Air in fuel system. Restriction in exhaust pipe. Low voltage - Charge battery. Diesel injection nozzles faulty or sticking. Filter clogged. Long Idle periods.

Steering does not work on my tractor. How can I fix it?

The hydraulic system has air. You should draw out air. The minimum hydraulic oil indicator in system. Fill the tank. Steering cylinder has problems Replace the faulty part.

I am working on the exact same tractor. Why motor failure to start? How do i fix this defect?

Improper valve timing - Set a valve timing. Bad compression. Cylinder bores are worn - You must fix it. Leaks between valves and seats - Need Removal of leakage.

John Deere 4640 malfunctions. This is a diesel motor knock. what kind of damage?

Lack of oil. Add oil. Cooling temperature is minimum.

I can't figure it out why tractor front axle to howls continuously when tractor run?

Teeth of gears collapsed. Replace gears. ball bearings crumbled. Replace it.

I own this model three years. Regularly diesel starting is intermittent. How to eliminate?

Nozzle is dirty. It is required to check a nozzle. High-pressure fuel pump is damaged. Do overhaul of fuel pump.

I get the same tractor. Can someone explain to me what's problem if differential lock broke down suddenly? How to solve the problem?

This is the diaphragm rupture or discs friction clutch worn out. You have to make repairs.

Our company has 4640 tractor. Engine not starting. I need to know can i fix the problem?

Most likely fuel filter element has dirt. Otherwise injection pump is improperly adjuste.

Please help. Engine overheats regularly. What kind of malfunction?

Low coolant level. Fill radiator to proper level, check radiator, coolant recovery tank, and hoses for loose connection or leaks. Dirty radiator core, or grille screens. Remove all trash. Engine overloaded. Shift to lower gear or reduce load. Loose or problem fan belt. Adjust belt tension.

My friend has JD 4640. Today he heard knocking in the rear axle housing. What's wrong?

All symptoms talk about destruction of bearings.

Help with the question what defect if motor white exhaust smoke?

If white gas comes from the exhaust pipe you required to replace piston rings urgently.