Bobcat 331: Problems, Durability, Repairs

To this day, Bobcat 331 remains one of the most reliable mini-excavators on the market. Although the company doesn't produce it anymore, you can still buy used models. Thanks to its small size, Bobcat 331 is perfect for landscaping in areas that are otherwise hard to access. And despite the many recalls it went through, this mini-excavator remains extremely popular even today.

But that doesn't mean it's without any flaws. Bobcat 331 has its fair share of problems. But does this mean you shouldn't buy it?

We're going to discuss the following problems with Bobcat 331:

• Faulty hydraulic system
• Issues with fuel components
• Electrical problems
• Engine issues
• Loose or slipping tracks
• Malfunctioning boom

How long should a Bobcat 331 last?

Most mini-excavators last for about 10,000 hours and Bobcat 331 is no exception. However, this is assuming you take good care of this. Without regular maintenance, this number can quickly drop below 8,000. Typical maintenance includes cleaning debris from the body, checking fluid levels, and lubricating the boom. You should do this at least once a month or even more often.

Another thing to note is that you can't buy a brand-new Bobcat 331 anymore - you only buy used models. Always ask the vendor how old the model is since you will need to subtract those hours to calculate its expected lifespan.

6 common problems with the Bobcat 331 model

While Bobcat 331 is a reliable excavator, it's not without its flaws. These become especially pronounced when it becomes too old. The problems can occur with any of the systems, from wiring to engine. But thankfully, you can fix most of these issues at home.

Here are the 6 common problems with the Bobcat 331 model:

1. Faulty hydraulic system

Over time your Bobcat 331 may develop issues with the hydraulic system. Perhaps the most common problem is hydraulic fluid leaks. These are dangerous for several reasons. Not only do they reduce the performance of your excavator, but they can also contaminate nearby components such as the engine.

Leaks may additionally lead to lower cooling efficiency which can overheat the entire body of your Bobcat 331.

But what causes the hydraulic system to fail? You'll need to inspect two components - the cylinder and the hoses.

The cylinder is a key component driving the Bobcat 331. When it fails, the entire machine will stop working. But while the component can malfunction due to physical damage, it's more likely to go bad because of old age. If it's faulty, you'll have to replace it entirely.

The other faulty component may be the hoses. You should inspect these first if you experience leaks in the hydraulic system. Mechanical damage and corrosion are two main reasons behind the malfunctioning hoses on the Bobcat 331.

Solution:

Issues with the hydraulic system happen mostly because of poor maintenance. When debris gets stuck inside the system, it can stop working. Luckily, you can prevent issues with the hydraulic system by cleaning it regularly. We recommend doing so once a month as the bare minimum.

2. Issues with fuel components

The next common set of issues is related to the fuel system. The affected components are filters, pumps, and fuel lines. When any of these components become clogged, your excavator won't receive enough fuel supply. This can lead to throttling and even stalling. In the worst-case scenario, you may be unable to start it.

Consider the fuel filter. When clogged, your engine won't receive enough fuel to function properly. Not only will this limit its performance, but also lower its lifespan. If the clogging isn't too bad, you can usually fix the issue by cleaning. However, we recommend replacing the whole part. Otherwise, the symptoms may return.

The Bobcat 331 will also run poorly when the fuel becomes contaminated. This can happen when you use old or incorrect fuel. However, it can once again happen when debris enters the system. Bobcat 331 is especially sensitive to this issue so be prepared to check it regularly.

And lastly, the excavator's fuel pump can malfunction. This also happens because of wear or physical damage. You shouldn't use Bobcat 331 if you have fuel pump issues. Doing so will only worsen its condition, leading to costlier repairs.

Solution:

Replace the faulty fuel system components to restore the fuel supply to the engine. Make sure you clean the components regularly to prevent the issues from returning.

3. Electrical problems

The Bobcat 331 can sometimes exhibit symptoms of electrical problems. Luckily, are often the easiest ones to fix. They often happen because of a dead battery, faulty sensors, or wiring issues.

But first, let's look at the symptoms of electrical problems. Starting issues often point to a faulty battery. And even if you manage to start your Bobcat 331, you may experience frequent stalling.

These issues often result from a dead battery. In the best-case scenario, the battery just needs recharging. However, it may also be damaged. Check for corroded terminals and other deformities. If you find any, you'll have to replace them.

Bobcat 331's electrical issues may also happen because of bad sensors and loose wires. Unfortunately, you won't be able to fix these without professional help.

4. Engine issues

Engine issues are also common with Bobcat 331. These are also the most serious ones since they lower your excavator's overall performance. Apart from clogged fuel lines and dead batteries, the engine can also stall because of oil leaks.

Oil leaks happen when some of the seals and gaskets become loose. Many Bobcat 331 owners report this issue. Low oil levels lead to increased friction and heat. This will make the engine wear down even faster. We advise against using your excavator in this state.

Solution:

If you experience stalling, check the battery and fuel system. In case of oil leaks, make sure your oil levels reach the recommended mark. If they keep dropping, your excavator likely leaks. This means you'll need to visit a mechanic to have it fixed.

5. Loose or slipping tracks

Slipping tracks can be a nightmare when it comes to operating excavators. Unfortunately, you will likely run into this problem when using Bobcat 331. This can make the machine frustrating to move.

The tracks usually start slipping when the excavator's too old. But sometimes it can happen when you use it on rugged terrain. Driving for long distances can also cause your tracks to start slipping.

The tracks can also become loose, especially if there's dirt stuck between them.

Solution:

Retightening the tracks should do the trick. If the issue returns, you may have to buy new ones. Make sure to clean the tracks regularly to prevent them from slipping.

6. Malfunctioning boom

The boom is the most important part of Bobcat 331 or any excavator in general. After all, you won't get anything done without it. However, the boom of Bobcat 331 is known to malfunction. The first reason is overload. Each excavator comes with specs that describe how much weight it can carry. Make sure you don't put too much strain on the boom or you risk damaging it.

Another reason for boom failure is poor maintenance. You should lubricate the joints frequently to reduce excess friction.

Solution:

Don't try to lift more than your excavator can handle. Lubricate the components at least once a month for better performance.

Final thoughts on Bobcat 331 problems

Although many people still swear by Bobcat 331, the machine isn't without its flaws. It can fail in many different areas, from the hydraulic system to the engine. This is inevitable when you're buying old, used models.

The hydraulics issues are fairly common and affect the overall performance of the mini-excavator. Many owners report hydraulic fluid leaks which affect the power of the boom. If the fluid drips onto other components, it may cause your engine to overheat as well. The hydraulic system usually goes bad because of corroded hoses or damaged cylinders. Replacing these components is the only solution.

Another category is problems with the fuel system. The fuel filter, fuel pump, or fuel lines can become blocked. This limits the fuel supply, leading to poor engine performance. This leads to misfiring and stalling. The surest way to fix this is to clean the fuel system regularly. But if it becomes too bad, you will need to replace the clogged component.

Make sure you check the electrical system regularly as well. Many Bobcat 331 owners report battery issues. Check the terminals to see whether they're corroded. If yes, you'll need to replace it. Loose wiring and bad sensors are also common.

Keep track of your oil and replenish it as needed to ensure smooth operation.

Bobcat 331 is notorious for slipping tracks as well. This can happen if you drive on rough terrain. The average lifespan of tracks is about two years so make sure you replace them regularly.

And finally, you'll need to lubricate the boom at least once a month. Otherwise, it may become stuck, preventing you from using your Bobcat 331.