6300,6300l,6400,6400l Tractor Radiator

Experienced gardeners share their insights in answering this question :
Have you tried giving it a good tuneup?

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

What to Do If Your Tractor Won`t Start, Just Clicks. If your John Deere won`t crank and all you hear are clicking sounds when you turn the key, you likely have a bad battery or a bad connection somewhere between the battery and the starter. Double check that the alternator and battery connections are clean and tight.
According to Raby, the primary reason a diesel tractor turns over but won`t start is because air is present somewhere in the fuel system. Running a tractor till it`s low or out of fuel and a clogged fuel filter are two of the more common ways air gets into the system.
The most common cause for the engine not turning over is simply the battery. Either the battery itself is dead, the terminals are corroded so the current can`t travel through them, or the battery cables themselves are damaged. Inspect your battery terminals and cables, and test the battery.
The Spark Plugs

The engine`s spark plugs get worn down and damaged over time due to use. A faulty spark plug can cause hard starts, low fuel consumption, and reduced performance. Spark plugs can be one of the first things you check when your tractor performance is off.

If your tractor is making a clicking sound when you turn the ignition, this may be a sign that there is an issue with your tractor starter motor. If you hear a whirring sound it may be due to the pinion gear not engaging with the flywheel.
For optimal performance, a diesel engine`s primary need is a continuous supply of clean fuel. A symptom known as “airlock” occurs when this flow is interrupted by an air bubble, causing the engine to shut down and refuse to start.
A major cause for fuel injection pump problems is the use of dirty fuel. Over time, residue builds up throughout your system. Using poor-quality fuel exacerbates this issue. Bring your vehicle in for auto repair if you notice sputtering or your vehicle hesitates when accelerating.
As a general rule, some smoke upon initial startup for a few moments is common, Urso notes. “Black smoke is traditionally associated with a rich combustion process or an overload (abnormal mechanical resistance),” he continues. “White smoke (contingent on its odor) signifies insufficient temperature.
When a fuel pump fails, fuel line pressure is lost thus not being able to deliver any fuel for the engine to fire up. Downtime of equipment for major repair is expected at this point to get the fuel flowing properly again.
In bypass starting, you touch a wrench or a screwdriver to the terminals of the starter motor, to the solenoid of a tractor, or to other equipment. This bypasses all tractor-neutral starting switches. Sparks fly and electricity snaps as the circuit is completed, the starter engages and the engine starts.
Tractors go slow because they have high torque where the increase of engine rotations makes transport of very heavy loads easier and more efficient, which is the main purpose of this vehicle. It gives them enough power to drive, especially when rolling up the hill or on the field, requiring them to go slow.
However, other aspects of the machine, like the transmission, clutches, hydraulics, and more may need to be replaced to keep the tractor in good running order. A general rule of thumb is that 2,000 to 2,500 hours is well broken-in while anything above 35,000 hours is considered high.
Touch the metal shaft of a screwdriver to both of the large terminals at the same time. If the engine turns over and starts, the solenoid is bad and should be replaced. If the starter motor does not run, the motor itself is probably defective.
Connect the remote starter switch to the battery positive and the solenoid (smaller wire) terminal on the starter and click the switch. If nothing happens, you`ve got a bad starter. If the starter turns, the problem is in the electrical system.
When the diesel fuel is put into the pump, one end allows the fuel to move into the chamber where the combustion will take place and the other end is where the plunger is located. As the plunger moves back and forth, it leaves an opening for the fuel to go into the combustion chamber while moving backwards.
While a diesel pump is responsible for pumping out diesel fuel, a fuel pump can also be responsible for pumping out gasoline, depending on the type of engine. Both gasoline and diesel engines are internal combustion engines, which means they both have a mixture of air and fuel that is ignited to power the vehicle.
When you change a diesel fuel filter, run out of fuel or disturb the fuel system, air is trapped. When you try to start the engine this air acts as a lock, preventing the normal supply of fuel into the cylinder.
Running Out of Diesel

When a diesel engine draws in air instead of fuel, both the fuel pump and fuel injectors can become damaged. This is because diesel fuel is used to lubricate the moving parts these components have.

Fuel pump failures can be caused by electrical faults, old age (wear) or fuel contaminants (dirt, moisture or bad gas). Fuel pump failures often occur without warning. Fuel pumps, injectors and pressure regulators are the three most commonly replaced fuel system components.
The most common reason a pump fails is wear on the pump from improper lubrication or over-use. The best way to explain a failed fuel pump due to wear and tear is to explain what other reasons may have lead to a failed pump: Most fuel pumps are lubricated by the fuel in the tank itself.
The most common is improper lubrication when the incorrect lubricant is used or not enough is applied. Bearings also fail in extreme temperatures. Another cause of failure is bearing overload, e.g., a pump cavitating from lacking the proper flow will increase pressure on the impeller`s front.
White exhaust smoke from the tailpipe usually means raw diesel is passing through the combustion chamber into your exhaust stream. This happens when the engine`s combustion cylinders aren`t hot enough to burn the diesel.
Most common causes of black smoke are faulty injectors, a faulty injector pump, a bad air filter (causing not enough oxygen to be supplied), a bad EGR valve (causing the valves to clog) or even a bad turbocharger.
Because fuel pumps constantly run whenever the ignition is turned on, they can eventually wear out and weaken over time. A weak fuel pump may still pump fuel, but the vehicle may experience difficulty starting from the lack of pressure.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Fuel tank fuel pump is weak and tractor will run at times and other times will not start 6400 john deere tractor.
ANSWER : Have you tried giving it a good tuneup?

My Tractor (425) won't start – John Deere 420,1020,2010,2020,2510,2520 Tractor Float
ANSWER : If you have no spark the first thing to replace the time delay module on the left rear side of engine. Its black and about 2 inches by 1 inch with yellow,red,orange and black wires going to it. Replacement is round shaped with same amount of wires.If no fuel to carb check for flow at filter, if theres flow but no pressure look for a split fuel line in tank between pump and sender.

Problem starting every time when starting cold I have to crank engine several times, after it runs it will start every time until it sets for a few days, then back to the repeated cranking.
ANSWER : Thats perfectly normal

My la 125 john deere runs about 30 minutes then looses all fuel Ive changed fuel pump and filter and cleaned tank and pickup tube
ANSWER : Check the switch on the botom of the bowl of the carb

I have John Deere GX345. It does not start consistently. When it doesn’t start the plugs have no spark. The problem is intermittent.All electrical connections look clean and no corrosion. Re- seated all connections. Fuel flow is good because I can smell raw fuel while cranking the motor. I replaced the fuel lines last year. Thank you for your help. Daryl Witowski
ANSWER : Look for a small silver box with 1 wire on it mounted to the motor. It is a temp sensor and will keep it from firing…Just had to replace mine…

I cannot get the tractor to continue running even after I add starting fluid. It runs as long as I add fluid. I bought a fuel filter , pump and hoses. I still can’t get the engine to keep running. I even took off the gas tank and drained it. John Hanna Jr, Gallatin, Tennessee 37066
ANSWER : I would take the carburetor apart and soak it in a solvent. It is very common for the fuel passages to become blocked by gasoline which has turned to a shellac type substance over a long winter of sitting idle. If it was running fine earlier this year then that is not the problem, but it sounds like a fuel supply and you have excluded the other possibilities so I would give that a shot anyway.

JD 6400 tractor, PTO light flashes when engaged but PTO does not work.
ANSWER : The most likely problem is the pto solenoid valve on the rear of the tractor.It could be the speed sensor but you won’t know until you get the codes read by the dealer.I have had to replace the b.c.u. for this problem but it is not common.

I have changed the fuel filter on a John Deere L130 garden tractor and the engine is still not getting gas. Is there a fuel pump or other part which would stop the flow of gas to carbuerator?
ANSWER : Underneath carb bowl should be a wire. Unplug it and remove ( unscrew) electric gas shutoff. Replace.