Bobcat T66 Problems : 6 Common Issues (Explained)

Bobcat has definitely made a name for itself when it comes to producing quality track loaders. However, not all of their track loaders function as efficiently as most customers would expect. In this article we are going to be discussing about a particular model, which is the T66 and some of the problems it experiences overtime.

Table of Contents

What Is A Bobcat T66?

The Bobcat T66 is one of the latest track loaders you will find on the market. It has a redesigned Bobcat inline engine and a direct- drive system. It also has an improved cooling system and is able to deliver powerful hydraulics. This means that it also has impressive lifting capabilities.

Bobcat T66 Problems

NB: The Bobcat T66 is sold without any malfunctioning parts and the problems highlighted in this article are usually influenced by human error or wear and tear of the machine.

1. Starting Problems

One of the problems which you may experience with the Bobcat T66 is that the engine might refuse to start. This problem is usually caused by a number of factors some of which include;

  • A dead of faulty battery.
  • Dirty air filter.
  • Lack of fuel in fuel tank.

Troubleshooting Starting Problem

If the engine of your Bobcat T66 is refusing to start, there are a couple of ways in which you can try to resolve the issue. Below are some methods which you can try out.

  • Check battery connections and recharge battery. If battery is faulty, you will need to purchase a new one.
  • Clean air filter and replace if damaged.
  • Check fuel tank and put more flue if it is finished.

2. Engine Overheats

Another problem which you may experience with the Bobcat T66 is that the engine tends to overheat. This is a serious problem that can damage the entire engine system of your machine so you have to attend to it as soon as possible. Some of the factors that may cause your engine to overheat are;

  • Dirty or damaged air filter.
  • Low or lack of engine coolant.
  • Damaged Radiator.

Troubleshooting Engine Overheats Problem

When the engine of your Bobcat T66 overheats, here is what you should do in order to resolve the issue.

  • Clean the air filter or replace it with a new one if damaged.
  • Check engine coolant levels and replenish it if low.
  • Check radiator and have it fixed or replaced if damaged.

3. Difficulty In Controlling Machine

Another problem which you may encounter when using the Bobcat T66 is that controlling the vehicle might seem a bit difficult. This problem is influenced by many factors, some of which include;

  • Disconnected or loose steering.
  • Low hydraulic fluid.
  • Worn tracks.
  • Damaged drive motors.

Troubleshooting Difficulty In Controlling Machine Problem

If you are having a hard time controlling your Bobcat T66, here are a few troubleshooting techniques that you can always try out.

  • Check steering wheel and tighten it if there are any loose connections.
  • Check hydraulic fluid and replenish it if low.
  • Replace tracks with new ones, if they are worn out.
  • Replace drive motors if they are damaged.

4. Hydraulic Pump Fails

The hydraulic pump of a Bobcat T66 can sometime fail because of 2 main reasons;

  • Use of poor quality hydraulic fluid.
  • Engine overheating problems.

Troubleshooting hydraulic Pump Fails Problem

When the hydraulic pump of your Bobcat T66 fails here are a few things you can do in order to try and resolve the issue.

  • Drain hydraulic fluid and insert new fluid that is of high quality.
  • If engine is overheating, try to resolve the problem by checking the air filter to see if it is not clogged. Also check engine coolant levels and the radiator.

5. Engine Backfires Or Misfires

When the wrong type of fuel is inserted inside a Bobcat T66, the engine tends to backfire or to misfire. This can be very frustrating to many users.

Troubleshooting Engine Backfires Or Misfires Problem

In order to troubleshoot the engine backfires or misfires problem in a Bobcat T66, you should drain the wrong or contaminated fuel and replace it with clean fuel.

6. Hydraulic Leaks

Another common problem that you may experience with the Bobcat T66 is that the hydraulic might start leaking. This problem is usually caused by any of the following;

  • Improper installation.
  • Worn out hoses or fittings.

Troubleshooting Hydraulic Leak Problems

If you notice that the hydraulic of your Bobcat T66 is leaking, here are a few techniques you can use in order to resolve the issue;

  • Check all installations or connections and ensure that there are no leaks on your machine before switching it on.
  • Check hoses and fittings and replace if they are worn out.

How To Avoid Bobcat T66 Problems

The best way to avoid Bobcat T66 problems is to regularly service the machine. This helps to ensure, that small problems are identified earlier before they emanate into even bigger problems. You should also make sure that you inspect your machine before and after every use, so that you can identify any problems. If you have not been using the Bobcat T66 for some time, it is important that you drain the old fuel and replenish it with clean fresh fuel, as there is a chance that it would be contaminated and will cause your track loader to malfunction.

What Is The Difference Between Bobcat T595 And T66?

The Bobcat T595 and T66 are often confused, but they are actually 2 different track loaders. For starters, these machines differ in terms of specifications. The T66 has a horsepower of 74hp whilst the T595 has 70hp. The Bobcat T66 as a 28.3 gal fuel tank and the T595 has a 36.5 gal. In terms of power and reliability, the T66 is actually more reliable and powerful than the T595.

Are Bobcats Reliable?

Yes, Bobcats are very reliable, they are actually one of the best track loaders available on the market and they are also very durable.


The Bobcat T66 might seem like a problematic machine however, it is actually one of the best track loaders that you will find on the market. So if you are thinking of purchasing this machine, don’t let the problems discussed above, derail you from your goal.