________________________________________________________________________________

John Deere 8400 Troubleshooting

The day before I noticed the problem on my JD 8400. Diesel doesn't turn over. Tell me please what could be the failure?

Fuel grade is wrong. Defective high pressure fuel pump. Inspect and replace. Wrong fuel injection pump timing. Need to set up.

John Deere 8400 failures. The engine fails to develop the full power. How to solve the problem?

Fuel shortage - Fill the tank and check fuel quality. Injector pump plunger and barrel worn. Replace with a new one.

Help anybody why engine runs irregularly?

Air cleaner element plugged. Dirty fuel filter - Clean or replace the filter element.

8400 tractor problem. Transmission shift hard at low speeds. What's fault?

Clutch pedal not fully depressed. Loose shifter housing bolts.

Please give me information why steering wheel turns too easy? What should I do to correct the situation?

Low hydraulic oil level in tank - Top up the oil. Steering cylinder has problems - Repair it. The steering pump is defective - Install a new pump.

I bought a JD 8400 in september. Presently there is issue. Engine won't start. Can somebody help me determine the cause of breakdown?

Starter failure - Change or refit. Clogging in the fuel line - You need to perform cleaning and washing. Dirty fuel filter element - Renstall filter element. Piston ring failure - Change piston rings.

I use the same tractor. Recently I noticed the steering is very hard. Help me find out what's malfunction?

Minimum Oil Rating. Fill the tank. hydraulic connection leaking. It is necessary to eliminate a damage. Pump of power steering is broke. Install the new pump. Hydraulic power steering is defective. Requires repair.

John Deere 8400 issue. Diesel starts hard. Please help me recognize the cause of malfunction. What needs to be repaired?

Fuel pump is not adjusted properly or dirty. Fuel shut-off valve closed. Incorrect functions of the cold start system. Damage or wear of piston rings. Gasket Blow-By or Leakage. Water mixed in the fuel. Fuel too heavy at low temperature.

JD 8400 engine issues. Motor long starting permanently. How could i fix a failure?

Restricted Fuel Lines. Air Leaks in Suction Lines. Clogging in exhaust pipe. Slow starter speed. Diesel injection nozzles faulty or sticking. Filter clogged. Incorrect timing.

Steering not working on my tractor. What is problem?

The air was formed in hydraulic system. You need remove air. Small level of oil in system. Top up the oil. Wear of the hydraulic steering cylinder Make a replacement.

I have the same tractor. Why motor has not been started? How could i resolve an issue?

Valve timing is improper - Adjust valve timing. Bad compression. Cylinder bores are worn - Need overhaul. Leaks between valves and seats - Eliminate leak.

John Deere 8400 damages. Diesel engine knocks. what kind of trouble?

Lack of oil. You should pour this. Too much bearing play. Injection volume incorrectly set - Adjust settings.

Please help to understand why front axle to howls incessantly when tractor run?

This is gears damage. You need to install new gears. Bearings are firmly erased. Replace it.

I have this tractor about 5 years. Recently, diesel starting is intermittent. How to get rid of this?

Nozzle has dirt. You must checking injector. The fuel pump has a malfunction. Replace fuel pump.

I bought the exact same model. Answer my question why locking differential does not work swiftly? What's solution to the problem?

Diaphragm worn out or wear of discs friction clutch. You have to make repairs.

I'm using John Deere 8400. Diesel engine not starting. Tell me what's issue?

Most likely Dirt in the fuel system. Or high-pressure fuel pump to lost adjustments.

I have the problem. Diesel overheating occurs. What kind of malfunction?

Little coolant in the cooling system. You need to fill the system. Dirty radiator core, or grille screens. Remove all trash. Excessive load - Reduce load or speed. Broken or misadjusted fan belt - Adjust or replace.

My friend has 8400 tractor. Yesterday he diagnosed knocking in the rear axle. What is the malfunction?

These sounds talk about destruction of bearings.

Can someone say me what is the reason that diesel engine emits white smoke?

If white gas comes out of the exhaust pipe you required to carry out replacement of piston rings immediately. Piston ring and cylinder worn or stuck - Repair or replace.

JOHN DEERE TRACTORS ATTACHMENTS
1023E	2025R	2210	2520	3032E
3046R	3520	4066R	4105	4200
4320	4400	4520	4600	4720
430	420	455	X300	X350
X485	X500	X590	X700	X738

JOHN DEERE TRACTORS TROUBLESHOOTING
2640	3040	3310	3650	4100
5050D	5090R	5410	6105R	7200R
E130	L111	LA110	LT155	X300R