9 Kubota B3350 Problems & Quick Fixes

Kubota B3350 Problems Image

The Kubota b3350 model, a compact utility tractor,  is perfect for small-scale commercial work and large yards. In addition, it’s the ideal choice when mowing on uneven or hilly terrain.

The Mower’s state-of-the-art regeneration capabilities provide excellent emission control. With this feature, you needn’t worry about your loved ones’ health after mowing for extended periods.

However, despite its perks, you should beware of several Kubota b3350 problems. This post focuses on the major issues you’ll encounter with your Mower and some troubleshooting options.

Common Kubota B3350 Problems

Problem 1: Kubota b3350 DPF Regeneration Problem

DPF regeneration entails getting rid of the soot in the diesel particulate filter. Typically, the soot is burnt at high temperatures, creating room for more collection.

There are two types of regeneration including;

Passive regeneration

Passive regeneration occurs when the diesel particulate filter burns the soot to clean itself. This type of regeneration stops as soon as you arrive at your destination.

Active regeneration

In active regeneration, which occurs when riding short distances, the Mower automatically switches to high exhaust temperatures when the collected soot reaches certain levels.

Then, the car utilizes a post-combustion fuel injection to burn the collected soot.

Typically, during active regeneration, a DPF warning will indicate on the dashboard when you reach your destination before the vehicle burns all the soot.

Unfortunately, this may clog the system. Luckily, you can clear the blockage if you drive for about 15 minutes at a 40mph speed.

Reasons why you may encounter Kubota regeneration problems, also called the aborted DPF regeneration cycle in your mower, include;

A Failed Sensor in the Engine

The regeneration process in Kubota mowers relies on sensors to determine when to oxidize the soot.

Unfortunately, the sensors located in the engine may fail, affecting the performance of the regeneration system.

As a result, the engine will fail to regenerate uninterruptedly, failing to indicate the engine management system.

Read: Kubota L3560 Hitches and Quick Solutions

Driving Short Distances Regularly

This is another primary cause of regeneration issues in the Kubota b3350 mower. When you drive for short distances, you may stop the tractor before the active regeneration cycle completes.

This means that you abort the regeneration process midway. Consequently, the oil injected into the cylinder doesn’t pump and instead drains into the sump.

Typically, the vehicle will avert the regeneration issue by running the radiator fan continuously even after the engine stops.

Driving after DPF Regeneration Fails

While your vehicle will still operate normally after the regeneration process fails, the indicator on the Mower’s dashboard will persist.

Ignoring the regeneration issue alert and continuing to ride long distances could block the DPF filter entirely. Consequently, at this stage, the Mower fails to achieve automatic regeneration.

Related: Kubota M5 111 Hitches and Quick Solutions

The Fix  

You can resolve the regeneration problems by;

Using a DPF cleaner additive

DPF regeneration issues, which occur when the regeneration process is aborted midway, may cause your filter to clog.

To correct this, add a DPF cleaning additive before driving the Mower for at least 15 minutes.

Forced regeneration

If you drive your Mower for a long distance after an aborted regeneration, the engine will fail to regenerate automatically.

Consequently, you’ll have to visit a professional using a DPF delete kit to force regeneration.  

Top up the oil

Typically, your Mower won’t regenerate if the oil level is less than ¼ of the fuel tank capacity. When encountering regeneration issues, inspect the oil level and top it up as required.

See: Kubota L3901 Hitches and Solution

Problem 2: Kubota b3350 Electrical Issues

Regrettably, regardless of your tractor brand, this is a general issue you will likely encounter. Lucky for you, common electrical issues in the Kubota b3350 model are easy to diagnose and fix.

The battery will likely get damaged when your Mower lies unused over extended periods, say over the winter.

Similarly, faulty spark plugs in the engine are a major reason behind your Mower’s electrical problems. The spark plug ignites the fuel for combustion.

Similarly, your tractor might start losing power when your vehicle’s carburetor clogs or gets damaged.

The Fix

If your Mower doesn’t start or loses power, you’ll want to check the battery since it drains when it’s idle or stored for a long time. Recharging the battery should resolve the issue.

However, the cells might have gone bad if the issue persists after charging the battery. As a result, the battery cannot hold any charge, thus requiring replacement.

Alternatively, check for loose or incomplete connections around the battery, including the terminals. Similarly, corrosion or wear may affect the connection, resulting in starting issues.

Also, if your spark plug is faulty, you’ll want to clean it or replace it altogether. Besides being easy to install, spark plugs are also inexpensive.

See: Common Kubota GR2120 Hitches and Solutions

Problem 3: Kubota b3350 Engine Problems

If your Mower encounters engine problems, it becomes hard to start and operate at lower speeds, among other signs of poor performance.

The engine, the primary source of the Mower’s power, will affect the machine’s performance if defective. Typically, engine problems occur due to a faulty spark plug.

Similarly, a clogged or damaged carburetor may affect your Mower’s engine performance. This makes it hard to start the engine.

Similarly, your Mower’s engine could knock due to clogged fins or a leaking radiator cap.

Another culprit for a faulty engine is when air gets trapped in the fuel system. Lastly, you’ll likely encounter this problem if your vehicle’s fuel level is low.

The Fix

If the engine doesn’t run optimally, check if the filter is clogged and perform the necessary maintenance.

Also, try bleeding out any air trapped in the fuel system. If it doesn’t resolve the issue, you might need to replace the fuel pump or injection nozzle.

Alternatively, check the fuel level and top up as required. Lastly, inspect the radiator for clogs and check the cap for leaks.

If this issue persists, you’ll want to consult an authorized Kubota dealer for professional assistance.

Recommended reading: Common Kubota B2601 Hitches

Problem 4: Kubota b3350 Poor Cut Quality

With time, your Mower’s efficiency in cutting the grass will reduce. Also, if you set the blades to a low cutting height, you’ll encounter this problem.

In such cases, your Mower will cut the grass unevenly, defeating the purpose of mowing. Also, blades tend to dull over time, resulting in uneven cuts.

Moreover, the blade might bend if it hits a hard surface, such as rocks, when mowing. Similarly, cutting problems occur when the Mower starts to run abruptly or if you suddenly increase the mowing speed.

Also, if your Mower’s deck is bent at the spindle, it could result in uneven cutting. Fortunately, you can circumvent this issue by applying the fixes below.

The Fix

Park your Kubota b3350 mower on a flat surface and measure the blade tips against the surface.

Afterward, adjust the blade to the correct cutting height. This ensures that the blades cut through the grass evenly.

Also, check if the blades are blunt and resharpen them if necessary. If they’re new blades, you might have hit a hard surface, causing a bend. So, you’ll want to replace the blade entirely.

Related: Kubota Z421 Hitches & Quick Fixes

Problem 5; Kubota b3350 Software Update Issues

With rapid advancements in tractor technology, digital systems are now taking over most user-controlled tasks. This results in increased comfort and ease of use of tractors and lawnmowers.

While Kubota upgraded the software of the B3350 model, many issues still exist. For instance, trying to remove the DPF renders the Mower useless.

This might happen, especially if you still need to update the engine ECU to the latest version.

The Fix

Removing the sensors and DPF will require that you update the software to get the Mower running. But, again, this is largely a compatibility issue. 

Problem 6: Kubota b3350 Shutting Down and Stalling

Some users have complained that their Mower shuts down even when the regen light isn’t indicated in the dashboard. Unfortunately, this means that there are other issues at play.

If your mower stalls or shuts down suddenly, it could be due to fuel flow issues. The fuel filter or fuel lines are likely to have clogged.

Similarly, airflow issues could cause your Mower to stall. While excess air might cause the issue, a clogged air filter could restrict the airflow, causing the engine to shut down.

Additionally, overheating could cause your Mower to stall. When there’s excessive heat, the fuel solenoid disengages.

Also, a loose connection in the ignition wires might be the reason behind your tractor stalling.

The Fix

If the fuel line is clogged, you’ll require a high-powered airflow to alleviate the situation. Also, if you notice muddy textures in the filter, you’ll want to replace it.

Alternatively, clean the air filter if it’s clogged to allow sufficient airflow. If the filter is old, consider replacing it.

See Also: Kubota L2501 Hitches

Problem 7: Kubota B3350 Transmission Problems

The Kubota b3350 mower uses a hydrostatic transmission system. The transmission system, which relies on hydraulic pumps, consists of a liquid that turns electrical power from the battery to mechanical power.

Unfortunately, with such a transmission system, you’re bound to encounter concerns with the state as well as the level of hydraulic fluid.

Similarly, you could experience transmission problems when mechanical issues occur in the mower’s hydraulic system. Some of the typical transmission problems include;

  • Irregular movement of the transmission system’s driver axle.
  • Faulty attachment in the hose used to connect the hydraulic pump to the mower’s engine.
  • Varying oil viscosity due to inconsistent temperature.

The Fix

Usually, when your mower lies unused for so long, you risk having air in the pipes, affecting its performance. So, before spring onset, purge the mower to expel all the air.

Alternatively, the issue could be as simple as insufficient engine oil level. In this case, you’ll want to top-up the oil as required. Similarly, you might want to change the hydraulic oil.

Lastly, inspect major electric and manual connections in the transmission system of your mower for breaks or leaks.

Related: Kubota Bx2380 Hitches and Quick Fixes

Problem 8: Kubota b3350 Steering Issues

Steering problems have been a prevalent concern for most Kubota B series mowers. Typically, you’ll find it difficult to control the motion of your mower.

Similarly, changing direction with the mower, especially on uneven terrain, is no duck soup.

After conducting various inspections, we realized the issue arose from a faulty steering system or transmission.

The mower’s hydraulic pump is vital in the steering T-handle’s operation.

Consequently, any transmission issue could result in one unresponsive arm while the other arm operates smoothly. Unfortunately, some Kubota users have reported instances where both arms fail.

Sounds tragic, right? Hopefully, finding your way around this issue and averting all its possible causes could help avoid the trap altogether.

Also, you could encounter steering issues where one riding arm feels stiffer than the other.

Subsequently, one arm will overpower the other, causing the vehicle to move in one direction. This is more likely to occur when you apply full throttle on both hands.

The Fix

If one steering arm becomes unresponsive, check the connection between the motor and the arms.

Afterward, confirm that the control rod is connected to the motor. Fixing this should resolve the problem.

On the other hand, when one arm overpowers another, check for loose bolts at the base of the control arm. The bolts determine the mower’s motion and direction.

Interesting read: Kubota Zero Turn Troubleshooting

Problem 9: Kubota b3350 Overheating Issues

Most Kubota b3350 users are concerned about the engine’s tendency to overheat.

In addition to impacting the mower’s overall efficiency, overheating issues while speeding up the degradation of various components.

As such, addressing your mower’s overheating issue is vital to eliminate the need to visit your dealer or service shop for repairs frequently.

Typically, your mower could overheat if you’ve overworked the engine. Similarly, overheating could occur if you run the mower with the incorrect oil viscosity.

Another possible cause of your Kubota mower’s Kawasaki engine overheating is a fast idle speed and restricted airflow due to a clogged air intake screen.

The Fix

Try reducing the mower’s engine load to prevent your machine from overheating. Start by cutting down the mower’s cutting weight and operate the device on flat terrain.

Unfortunately, since the above solutions are only short-term, you’ll want to address the issue by dealing with the underlying cause. This includes sticking to a regular maintenance schedule.

This routine includes cleaning the components, changing the stale oil, and inspecting the engine oil level. Similarly, inspect the engine oil’s viscosity since it varies with age or weather.

Troubleshooting B3350 Kubota Problems

Engine Issues– Dirty air filter– Clean or replace the air filter regularly
– Fuel system problems– Check fuel lines and filters for clogs or leaks
– Ignition system faults– Inspect and replace spark plugs if necessary
Hydraulic System Leaks– Loose or damaged fittings– Tighten fittings or replace damaged components
– Worn-out hydraulic hoses– Replace worn hoses or seal any leaks
Transmission Problems– Low or contaminated transmission oil– Check transmission fluid levels and quality
– Clutch problems– Adjust or replace the clutch if necessary
Electrical Malfunctions– Loose or corroded connections– Inspect and secure all electrical connections
– Faulty electrical components– Replace any malfunctioning electrical parts
Cooling System Troubles– Coolant leaks– Inspect and repair leaks in the cooling system
– Malfunctioning water pump– Replace the water pump if necessary
PTO (Power Take-Off) Problems– Faulty PTO switch– Check and replace the PTO switch if needed
– PTO clutch issues– Adjust or replace the PTO clutch if necessary
Steering System Difficulties– Low or contaminated power steering fluid– Check and refill power steering fluid
– Steering linkage problems– Inspect and repair or replace any damaged parts
Tire or Track Issues– Worn-out tires or tracks– Replace tires or tracks if they are too worn
– Misaligned wheels or tracks– Align wheels or tracks properly
Fuel System Concerns– Contaminated fuel– Use clean and quality fuel
– Fuel filter clogs– Regularly replace the fuel filter
– Injector problems– Have injectors inspected and cleaned or replaced

Kubota B3350 Reviews: Is It Worth It?

Kubota mowers are reputed for the brand’s high manufacturing quality. As such, it’s no surprise that the Kubota b3350 compact utility tractor enjoys favorable user reviews.

However, it’s worrying that many users have reported encountering regeneration issues with the Mower’s DPF. Yet, the dealers are still unwilling to recall the tractor.

Therefore, while we don’t consider this model a risky investment, we don’t recommend purchasing the newer models due to the issues.


How long does a Kubota gas engine last?

While it depends on how well you maintain your Mower, expect your Kubota gas engine to last up to 20 years.

With routine maintenance, you can lengthen the longevity of your Mower. Kubota mowers utilise a reliable Kawasaki engine that is durable and easy to maintain.

What capacity can a Kubota B3350 lift?

The lifting capacity of a Kubota B3350 mower is 970 Kg (2139 lbs), and the 24-inch behind the lift point is about 770 kg (1676 lbs).

The Power Take-Off delivers the additional strength required for heavy-duty operations with 19.5 hp. The highest PTO horsepower for a B-series tractor is 27Hp.

Can you delete the DPF on a Kubota mower?

Yes, you can easily disable or deactivate your Kubota tractor’s DPF particulate filter system. You can also remove the EGR exhaust gas circulation system in your Mower. However, to avoid rendering your Mower unusable, you’ll want to update the software to the latest version available.

Does Removing DPF Affect The Mower’s Engine?

When you remove your Kubota mower’s DPF, you enhance fuel flow in the engine. In turn, this boosts power generation and pressure.

Deleting the DPF is one way of increasing the engine’s horsepower. However, when clogged, the DPF affects airflow, resulting in delays in the exhaust system.

Here is an article explaining the Kubota l3301 problems and fixes.

Final Thoughts on Kubota B3350 Problems

Many users enjoy the hydrostatic control of this Kubota model, eliminating the need to shift gears. Moreover, the Mower is powerful enough and suits landowners and farmers.

However, it also comes with its set of issues. Among the major Kubota b3330 problems is the DPF issue.

While the diesel particulate filter aims to achieve a cleaner environment, removing the emissions equipment could increase the performance of your Mower.

Despite these issues, many customers are still satisfied with this middle-sized tractor.