Kubota L4600 Problems

If you own a Kubota L4600 tractor, you may have experienced some common problems with the machine.

In this blog post, we’ll take a look at some of the most common issues owners have reported and offer some tips on how to fix them. 

Common Kubota L4600 Problems

The Kubota L4600 engine may not be starting because the fuel filter element is dirty. To fix this, you can change the filter element.

The engine may also not be starting because there is air in the fuel tank. To fix this, you can bleed the fuel tank.

If the fuel injection nozzles are clogged or faulty, they will need to be checked and replaced if required.

Lastly, if the fuel injection pump is malfunctioning, it will need to be replaced or rebuilt.

If you have checked all of these areas and the engine still will not start, it may be time to take it to a professional for further diagnosis.

2. Engine Shuts Off During Work

The most common reasons why the Kubota L4600 engine shuts off during operation are the timing of the fuel injection pump being incorrect, a dirty fuel filter, and the engine being cold. 

Filter maintenance is required to keep the engine running smoothly. 

If the engine is cold, warm it up as required.  

Another reason could be that the fuel pump is not working properly, or there is a problem with the ignition switch.

3. Engine Overheats

The Kubota L4600 engine overheats because of several reasons: dirty radiator fins, defective radiator cap, not enough coolant, broken or loose fan belt, and low engine oil level.

These problems can be prevented by properly maintaining your tractor and taking the necessary precautions.

For example, make sure to clean the radiator fins and install a new radiator cap; fill the cooling system with enough coolant; check components for leaks or other faults, and fill the crankcase with engine oil.

4. Engine Knocks

When the Kubota L4600 engine knocks, it’s usually because the air-fuel mixture in the cylinders is detonating too early.

This can happen for a number of reasons, including:

The engine isn’t properly preheated. Make sure to warm up the engine thoroughly before driving.

  • The oil level is low. Keep the crankcase filled with fresh oil.
  • The fuel injection timing is off. Adjust as recommended.
  • The pistons are worn or damaged. Piston replacement may be necessary.
  • The connecting rod is misaligned or faulty. Replace or align as needed.

Knocking can also be caused by using lower-octane fuel than what is recommended for your engine.

If you’re using the correct fuel and your engine is still knocking, have it checked out by a mechanic.

Engine knocking can cause serious damage if left untreated.

5. HST Transmission Making Noise

If your tractor’s hydrostatic transmission is making noise, it could be due to a number of different issues.

One common cause is Bent or unadjusted speed control pedal linkage. This can be easily fixed by replacing or adjusting the linkage.

Another possible cause is that the transmission is under excessive load. In this case, you will need to reduce the load on the transmission.

If the transmission oil is contaminated or the oil level is insufficient, this can also cause noise.

To fix this, simply change the transmission oil or top up to the proper level. If the relief valve is stuck, this can also cause noise.

In this case, you will need to replace the valve as required.

Finally, if there are damaged or worn components in the hydrostatic transmission, this can also cause noise.

To fix this, you will need to change or repair the defective parts.

6. Low Transmission Power

If your tractor’s transmission is experiencing low power, there are a few potential causes. One possibility is that the oil level is low and needs to be topped off. 

Another potential cause is a defective relief valve. 

This can be remedied by installing a new valve. Finally, bent or unadjusted speed control pedal linkage can also lead to low power. 

This can be fixed by adjusting or changing the linkage.

7. Hydraulic System Overheats

Overheating in a hydraulic system can occur for a variety of reasons. If the incorrect type of oil is used, it can cause the system to overheat. 

Dirty hydraulic fluid can also cause overheating, and the fluid must be changed on a regular basis to prevent this from happening. 

There may also be air in the hydraulic system, which needs to be bled out in order to prevent overheating. 

Finally, a faulty main relief valve can cause the system to overheat. 

If this is the case, the valve must be replaced. 

8. Hitch Won’t Drop

The Kubota L4600 hitch not dropping is a common issue that can be easily fixed.

There are four main reasons why your Kubota L4600 hitch may not be dropping: a broken hydraulic cylinder, an incorrect adjusted hydraulic spool valve, damage to the lift arm shaft, or simply an incorrect adjustment of the 3-point hitch.

A broken hydraulic cylinder is the most common reason for a Kubota L4600 hitch not dropping.

The hydraulic cylinder is responsible for extending and retracting the hitch arms. If the hydraulic cylinder is damaged, it will need to be replaced.

An incorrect adjustment of the hydraulic spool valve can also cause the hitch not to drop.

The hydraulic spool valve controls the flow of hydraulic fluid to the cylinder. If the valve is not adjusted correctly, it can prevent the hitch from dropping.

Damage to the lift arm shaft can also prevent the hitch from dropping.

The lift arm shaft connects the hitch arms to the tractor. If the shaft is damaged, it will need to be replaced.

Finally, an incorrect adjustment of the 3-point hitch can also cause the hitch not to drop.

9. Tractor Pulling to Left or Right

If your Kubota L4600 is pulling to the left or right, it could be caused by a number of different issues.

The most common causes are worn or damaged hydrostatic steering units, steering cylinder malfunctions, and incorrect toe-in.

If the problem is with the hydrostatic steering unit, you’ll need to inspect and replace it as required.

If the steering cylinder is malfunctioning, you’ll need to change or repair it.

And if the toe-in is incorrect, you’ll need to adjust the wheels.

Other potential causes of a Kubota L4600 pulling to the left or right include steering linkage joints that are worn or loose and front-wheel bearings that are worn or incorrectly adjusted.

What do People Say About Kubota L4600?

Some users have said that the Kubota L4600 tractor is “just what they were looking for” while others say it’s a great machine but too expensive. 

Some reviewers mention that it’s been very reliable, while others have had issues with parts breaking down. 

Overall, though, the Kubota L4600 tractor seems to be a good machine that can handle a variety of tasks on the farm.

Here are a few people’s reviews about Kubota L4600.

Source of Review: Tractorbynet.com

Terry Jones

“I absolutely love my L4600 HST. I bought the tractor mainly for moving and blowing snow around the Horse arena and hay barn. It has proven to be small enough to go anywhere and powerful enough to move anything I want to move with it.”

Mike Humeston

“Well made and designed almost perfect. I would add a guard rail on the left side of the drivers seat to keep from disengaging the transfer/range handle. Also, it would be nice to have two hooks on the outside of the FEL for light lifting. Also, a 5/16 hook on the inside of the bucket would be great.”

Edward Garcia

“I have an L4600 with just over 300 hours. Already I’m having engine troubles. It has no power and now the mechanic states that the fuel injectors are bad and need to be replaced. The mechanic states that with 300 hours the fuel injectors should not go bad this fast. “


The Kubota L4600 is a very versatile tractor that can be used for a variety of purposes. However, there have been some reports of problems with this tractor. 

Some owners have reported that the tractor does not start properly, or that it stalls frequently. 

Overall, the Kubota L4600 seems to be a decent tractor, but it does have its fair share of problems. 

If you are considering purchasing one, be sure to do your research and read reviews from other owners before making your decision.

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