6 Common Kubota B3350 Problems [Explained]

If you are the owner of a Kubota B3350 tractor, you may have experienced some problems with it. The Kubota B3350 is a popular tractor in North America, and many people depend on it for their livelihood.

However, there have been several complaints about this particular model. Some of the common Kubota B3350 problems are;

In this article, we will discuss some of the most common Kubota B3350 problems and how to fix them.

6 Kubota B3350 Problems: Tips & Fixes

DPF Regeneration Problems

The DPF (Diesel Particulate Filter) is head and shoulders above any other problem concerning the Kubota B3350; to say it’s a common issue would be an understatement.

What is DPF? DPF is the tractor self-cleaning black soot that’s built up on the filter from the exhaust gas and is burnt off and dispersed in order to make room for black soot.

The DPF system works in two ways, active regeneration, and passive regeneration.

Active regeneration happens when you’re driving short distances with your tractor; when the black soot gets to a specific level, the tractor will automatically engage the system and begin to burn off the black soot.

Passive regeneration happens when the system empties all black soot in one go.

One of the main issues with the Kubota B3350 is you need the regeneration system working for it to operate. If the regen system fails, you’re stuck!

There’s a light on the dashboard (that you need to ensure is working correctly) that begins blinking when DPF is underway. You can override and stop this, but I wouldn’t suggest it. If you do this one too many times, the whole system will fail, and you’ll be back at the dealership.

How to avoid issues? You need to run your tractor properly! Too many short trips will eventually create a massive build-up of soot, but the Kubota will never get warm enough for it to get into the DPF state; therefore it never completes a self-cleaning cycle.

Kubota B3350 Engine Issues

If you’re having issues with your tractor, and it’s not DPF related, chances are you’ve got a problem with the engine.

As with any lawn mower, tractor, or machine, spark plugs will always be your first check.

With machines like the Kubota B3350, they are doing hard work, which means the spark plugs will be collecting debris and dirt quicker than you’d expect.

If that doesn’t work, it could be one of several other issues; fuel injectors, glow plugs, air filter (clogged), or water in the fuel. These things can easily be fixed by taking it to your nearest Kubota dealer or with a little bit of self-maintenance.

Electrical Equipment Failing

A common issue I’ve come across regularly is electrical. Think of the vibration these machines go through; there’s always the potential for a problem.

Regular checking of electrical connections is essential before any large job and between regular runs, give the tractor a once over.

As I mentioned earlier, keep an eye on the dashboard lights too. They are critical for the DPF to run correctly.

Don’t forget the other simple ones, battery issues, etc.

Kubota B3350 Transmission Fluid Change

This is one of the most important things you can do for your tractor, and it’s something that’s so often overlooked.

The Kubota B3350 comes with a hydrostatic transmission, which means there are no gears to change; it uses hydraulic fluid to change direction.

Over time, this fluid will start to break down and cause problems. The most common is the tractor not moving or only moving in one direction.

A transmission fluid change is something that should be done every 300 hours or sooner if you’re using your tractor in extreme conditions.

Persistent Stalling

I don’t want to keep going on about it, but any cutting out or stalling is likely going to be down to an issue with the DPF, in which case you need to wait for 15/20 minutes, get it going again and ensure the DPF process can happen.

However, if you’re lucky enough to avoid DPF issues, you may well be the victim of fuel flow problems.

It’s common for the fuel line to kink or get damaged, which will prevent the flow of fuel from getting to the engine. Lack of airflow to an engine is a recipe for disaster, so definitely one to be aware of.

There’s also the potential for overheating. An easy one to fix with a bit of patience and coolant or water!

Software Compatibility Problems

Make sure your software is up to date!

The initial software installed with the tractor was full of bugs, constantly at the root of DPF and other issues; make sure you’re running the latest version.

Frequently Asked Questions:

How do you open the hood on a Kubota b3350?

To open the hood on a Kubota b3350, first, locate the latch inside the cab near the steering column. Once you have located the latch, pull it towards you to release the hood.

What engine is in the Kubota B3350?

The Kubota B3350 is equipped with a 33.0 HP EFI diesel engine.

What is the difference between L series and B series Kubota?

The main difference between L series and B series Kubota tractors is that the L series is designed for commercial use while the B series is designed for light-duty tasks. However, both tractor models are built with Kubota’s signature orange color. Additionally, both tractor models come standard with a 33 HP diesel engine.


Kubota B3350 tractors are popular because they’re durable, reliable, and built to last.

However, like with any machine, they’re not perfect and have their fair share of problems, the DPF regeneration problems being the main culprit.

But with regular maintenance and care, you can significantly reduce the risk of experiencing any major issues.

Please do your research before purchasing a Kubota B3350, and ensure it’s the right tractor for your needs. With the right care, your Kubota B3350 will provide you many years of faithful service. Thanks for reading!