5 Most Common Problems with Kubota B7500 and Their Fixes

Kubota B7500 Compact Utility Tractor was equipped with Kubota D1005-E-D16 diesel 3-cylinder liquid-cooled 61.1 ci engine. 

This utility tractor is equally suited to people who either have large gardens or small farms. 

However, consumers have been complaining about some common Kubota b7500 problems that they have experienced. They were sharing about starting issues, engine problems, hydrostatic transmission issues, steering issues, and more.

So, here I have decided to address the 5 most common issues that one might encounter with this hydrostatic mower.

Key Points:

  • The B7500 tractors may not be starting for the wrong position of the transmission gear shift lever. Or, these can be a serious battery issue.
  • You can use engine starting aids like glow plugs, intake preheaters, and block heaters.
  • The engine may be overheating. This can happen for the overload. You need to lighten the load or shift to a lower gear.

5 Most Common Problems with Kubota B7500 and Possible Solutions:

These are some of the most common Kubota B7500 problems, and some general ideas are shown about how these problems can normally be dealt with.

1. The tractor won’t start

The customers shared that their B7500 tractors were not being started. 

It can happen for the wrong position of the transmission gear shift lever. 

So, check the transmission gear shift lever. Place the range shift lever into neutral and check the engine throttle lever. Move the throttle half or full impulse.

Loosen or corroded battery connection can be one of the reasons. Check them and retighten them if necessary. 

Stale or improper fuel levels should be refilled. Clean or replace the air plugged intake filter or fuel filter. 

If any fuses get blown, you need to replace them. The fuel may not be getting to the cylinder. Check the shutoff valve. Sometimes, it may be too cold for the cylinder to combust a mixture of air and fuel. 

So, you will need proper seasonal diesel blends like winter blends with certain additives to ensure that they remain liquid when it is cold. And maintain the overall level and quality of the cooling system.

For the blockage in the coolant system, you may need to completely flush the whole coolant system and replace it as necessary.

Sometimes, the tractor won’t start, just clicks. It can be serious battery issues. Check that all the motor and battery connections are clean and tight and check if the battery voltage is right or not.

For the engine starting aids, use glow plugs, intake preheaters, and block heaters.

2. Engine problems

The dirty fuel injectors, faulty switch, and malfunction of the cold start system can cause engine problems. There may be no fuel flow as well.

Check that there are no leaks from any of the parts. Check the hoses and radiator to make sure there are no links or loose connections.

The exhaust smoke may be black or blue or white. This may be due to fuel inside the muffler, poor quality fuel, a clogged fuel injection nozzle, a defective thermostat or that may be sediment in the fuel may also be stale.

Again, the engine may be overheating. This can happen for the overload. You need to lighten the load or shift to a lower gear.

The fan belt may be loose or damaged. It should be easy to check for wear and tear and any tension and replace as necessary.

The radiator core or screens needs to be cleaned to solve the problem.

3. Hydrostatic transmission issues

Some customers said that the hydrostatic transmissions sometimes don’t have the power to respond to your shifting. This can happen if the transmission control arm may be out of adjustment.

There is a chance of activating the manual bypass lever when there is no response to your movement of the shift control arm.

Release the parking brake before shifting the machine, as the mower will not respond to your adjustment of the control lever to move forward or backward. 

And remember to disengage the cruise control before attempting to shift.

Additionally, metal dust in the hydraulic fluid may have worn the inside of the first charge pump and are getting into the seal plate areas of the main HST pump and motor, allowing internal leakage (pressure drops) that interfere with its operation.

If the fluid and filters are not kept clean, a hydrostatic transmission can over time become worn enough inside to work erratically, make noise, and eventually even stop driving.

Sometimes, tractors don’t get clean fluid and filters until the damage had been done. If that’s the case, replacing components to restore everything to original smoothness and fit may be more expensive than replacing the unit.

Sometimes flushing the old fluid out and replacing the filter might just get rid of the bad stuff and make it work better. 

4. Steering issues

As the whole steering system is controlled by steering gear, any problem like damaged or broken gear can bring about problems in steering.

The steering shaft or steering support can be worn out. If the mower hits a hard object, the ball joint may pop out of place. This can suffer the steering.

Low tire pressure will make the mower tough to navigate.

Whenever you encounter any reasons stated above, you need to take some steps. First, you need to examine the tire pressure by using a pressure gauge. Look at the mower’s operator manual to check the rate of optimum pressure, and compare the mentioned pressure with the present tire pressure.

Now, release or fill the tires until your requirements are fulfilled. 

Check the steering fluid. Check the hydraulic oil level, and check for any leaks.

The steering linkage may be in need of lubrication.

For these situations, you may need to adjust the steering. So, power off the mower. Then, loosen the bolts on the control arms. Move each steering arm from right to left after loosening the bolts with the wrench and adjust each arm as desired.

Re-tighten the one bolt closest to the base of each arm to set the arm’s left-to-right positioning and adjust each of the steering arms from front to back as desired.

At last, tighten the remaining bolts with the socket wrench according to your need.

5. Speed issue

One customer said that his B7500 started and ran great but the speed in low or high was slower than usual, running about 1000 rpm.

A fuel filter can cause this issue. 

What Majority of the Users Feel About Kubota b7500?

According to the new and old owners of Kubota b7500, this great Kubota tractor is perfectly sized for residential owners.

I also discovered that most of the users and owners are proud of their decision and claimed that this hydrostatic utility tractor is worth enough to give it a try. Some even claimed that this CUT is more than worthy of the reasonable price tag it has.

It is quite economical, runs well, and has a good engine. However, the customers say that it doesn’t have that much power and the replacement parts are expensive. People like its hydrostatic transmission for loader work. Overall, the size and build quality are impressive, and the parts service availability is also great.

Kubota B7500 maintenance and servicing

While your Kubota B7500 machine is certainly built with quality parts, they have a limited life. The good news is you can easily service your machine yourself using a maintenance kit or service kits or by getting the specific Kubota B7500 part needed to keep your mower or tractor running for a long time. 

Check the owner’s service and parts manual for full details. Check all the service intervals. Go for daily checks for every 50 hours, every 100 hours, every 200 hours, every 400 hours, every 800 hours, every 1500 hours, every 3000 hours, every one year, every two years, and service as required.


This Kubota b7500 is a hydrostatic mower. So, you should check the hydrostatic transmission with the PTO. And the other Kubota b7500 problems have been discussed with the possible solutions. Check them out and let us know your experience.

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