5 Common Kubota B7800 Problems With Effective Solutions!

Kubota B7800 is a well-known tractor model that landowners have been using for a long time. Despite being a reliable machine, like any other equipment, it is imperfect and can encounter issues over time.

So, what are the most common Kubota B7800 problems? Some common issues users may encounter are Electrical faults, hydraulic leaks, and brake failure. Other problems include weak lifting power and wiring issues. These issues can affect the performance and efficiency of the tractor.

Read on to gain a deeper understanding of the significant Kubota B7800 problems in depth. You will also get to know the solutions to the issues.

Common Problems With Kubota B7800 Tractor and Their Causes

Here is a quick overview of the common problems with Kubota B7800 and their solutions.

Major ProblemsTheir Solutions
1. Electrical faultsReplace the faulty alternator, check the battery connections and replace if faulty
2. Hydraulic leaksReplace worn-out seals, tighten loose fittings, or replace damaged hoses 
3. Brake failureReplace worn-out brake pads, fix damaged calipers, or flush the brake fluid
4. Weak lifting powerReplace a worn-out hydraulic pump, check and top up hydraulic fluid levels, or fix damaged cylinders
5. Wiring issuesFix damaged wires, tighten loose connections, or clean corroded terminals.

In-depth Analysis of Kubota B7800 Problems and Their Solutions

Here are the major problems with Kubota B7800 and their solutions discussed in-depth. 

1. Electrical Faults

The electrical system in Kubota B7800 tractors is responsible for powering various components, including lights, gauges, and switches. If your Kubota B7800 has an electrical fault, it won’t operate effectively.

Loose connections are among the most common causes of electrical issues in Kubota B7800. Vibration and normal wear and tear can cause electrical connections to loosen over time, leading to a loss of power or intermittent malfunctions.

Also, components like alternators, batteries, and starter motors can fail over time due to normal wear and tear or exposure to harsh environments.


  • Inspect the electrical system for signs of wear, damage, or loose connections. Once the problem is identified, the affected components should be repaired or replaced.
  • If loose connections cause the issue, tighten the connections and repair or replace any damaged components.

It is also essential to take your Kubota B7800 for inspection regularly to help identify any damaged components before they fail.

2. Hydraulic Leaks

Hydraulic leaks occur when the hydraulic fluid that powers the tractor’s system leaks from hoses, fittings, or seals. These leaks can lead to reduced performance and efficiency of the tractor’s hydraulic system, resulting in slower or weaker movements of the attachments.

The other causes of the issue are faulty seals and damaged or worn-out hydraulic fittings.


  • Identify the source of the leak. Inspecting the hoses, fittings, and seals for signs of wear and damage will reveal the source. Once the basis of the leak is identified, the affected component should be repaired or replaced.
  • If the hydraulic hoses or the seals are the problems, they should be replaced with others and inspected if fit. The hydraulic cylinder should also be checked for wear and damage and replaced if necessary.

3. Brake Failure

Brake failure occurs when the tractor’s brakes fail to work correctly, resulting in a loss of stopping power. The most common cause of brake failure in Kubota B7800 is the wearing out of brake pads or shoes. 

Another common cause of brake failure is hydraulic leaks. Hydraulic fluid activates the brakes, and if there is a leak in the system, the fluid pressure can drop, reducing the brakes’ stopping power.

The components that may cause leaks in a brake system include brake lines, brake calipers, brake wheel cylinders, master cylinders, and brake hoses.


  • If there is a hydraulic leak in the brake system, the components causing the leak should be repaired or replaced. Also, the hydraulic fluid should be topped up to the correct level. 
  • If the brake pads or shoes are worn-out or damaged, install new ones to replace the worn-out ones. 

4. Weak Lifting Power

Weak lifting power is when the tractor’s three-point hitch system fails to lift heavy loads. The most common causes of weak lifting power in Kubota B7800 are low hydraulic pressure, worn-out hydraulic seals, and malfunctioning hydraulic control valves.


  • Changing the hydraulic filler should be considered if the hydraulic pressure is low. Inspect the hydraulic pump, and top up the hydraulic fluid to the correct level.
  • The new hydraulic seals should be replaced if the issue is the wearing out of hydraulic seals. It is also essential to inspect the hydraulic system for leaks and repair them.
  • Accordingly, an inspection should be carried out, repaired, or replaced if the hydraulic control valves malfunction. It is also essential to check the hydraulic fluid level regularly and change the filter to avoid such situations in the future.

Check out this YouTube video on how to change the oil filters

5. Wiring Issues

Another common issue that Kubota B7800 owners face is wiring issues. Various factors can cause wiring issues. 

  • Exposure to moisture: When water or moisture penetrates the electrical system, it can corrode the wires and connections, leading to short circuits and malfunctioning components. 
  • Overheating: When the engine or electrical components overheat, it can damage the insulation on wires, causing them to short out or melt. This results in various electrical problems, including engine stalling, failure to start, or other electrical system malfunctions. 
  • Physical damage: Exposure to harsh conditions and sharp objects can cause damage to them. Electrical shorts may result, leading to malfunctioning components or system failure. 


The first step in fixing the wiring issue in Kubota B7800 is to identify the cause of the problem. Then repair or replace the affected components.

If moisture is the cause, the affected area is to be dried thoroughly, and any corroded wires or connections should be replaced. Therefore, if overheating is the cause, the engine’s cooling system should be inspected and repaired.

When physical damage is the cause, replace the affected part and remove any sharp objects from the area.


Kubota B7800 owners may maintain their tractors by diagnosing and fixing issues. Regular maintenance and inspections can also prevent these issues from occurring. 

Besides, it’s essential to address these issues as soon as possible to prevent further damage and maintain the longevity of your machine. With proper care and attention, the Kubota B7800 can remain a reliable and valuable asset for a long time.

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