5 LS MT125 Problems: Common Issues & Fixes

ls mt125 problems

Owning a LS MT125 can be both a joy and a headache. These tractors are notorious for having a lot of problems, but many of them can be fixed with some simple steps.

As with any heavy machinery, you’re going to have an issue. LS MT125 problems are inevitable; some of the most common include transmission issues, the joystick controller behaving erratically, and excessive exhaust smoke.

In this article, we will discuss some of the most common ls mt125 problems and their fixes. We will also provide some helpful tips to keep your ls mt125 running smoothly.

Let’s get started!

5 LS MT125 Tractor Problems

Problems Starting the Engine

If you’re having trouble starting your ls mt125, the first thing you should check is the fuel. These tractors use a lot of fuel, so it’s essential to ensure the tank is full. If the tank is empty, fill it up and try again.

Another common issue is clogged air filters. These filters must be replaced regularly to keep the engine running correctly. You can check the air filter by removing the cover from the ls mt125’s engine and looking inside. If it looks dirty, it needs to be replaced.

If you’re still having trouble starting the engine, there could be an issue with the battery. Charge the battery or failing that, replace it with a new one.

Don’t forget to double-check all the safety switches and connections. Ensure they’re all tight and nothing is loose, and keep the PTO switch in the off position.

Excessive Exhaust Smoke

One of the most common ls mt125 problems is excessive exhaust smoke. This is usually caused by an issue with the injectors. Over time, injectors can become clogged with debris and dirt. When this happens, they don’t function properly and cause the engine to produce too much smoke.

Important to note, what color is the smoke? That’ll go a long way to diagnosing your issue. Black smoke is a sign of too much fuel to air. Whereas white smoke is a sign of a lack of fuel supply, you can fix this by cleaning the air filters and ensuring your oil is at the right level.

LS MT125 Keeps Stalling

Now, this is annoying, the engine randomly cutting out at innocuous moments. First things first, make sure you’ve got enough fuel, it’s easy for your head to go straight to the extreme when there’s an issue, don’t forget the basics.

Ensure the valve gap is adjusted correctly, if your engine is cutting out at low speed, this could be the problem.

Finally, I’ve found that poor lubrication can rapidly speed up the time in which your tractor deteriorates. Always keep the tractor generously lubricated.

Transmission Problems

One of the most common ls mt125 problems is transmission issues. These tractors are known for having finicky transmissions, so it’s important to keep an eye on them.

The first thing you should do if you’re having transmission problems is to check the fluid levels. If the fluid is low, top it up to the required level. If the fluid is dirty, it needs to be replaced.

Another common issue is the failure of the transmission clutch. This can be caused by wear and tear or by a faulty clutch release bearing. If you think your transmission clutch is failing, take it to a mechanic for further diagnosis.

Remember, underneath the tractor; there is a plastic fan to cool the transmission and hydraulic fluids. Under the tractor, this can easily get clogged up with debris or broken. Double-check that this isn’t your issue.

Joystick Controller Issues

One of the ls mt125 problems is the joystick controller behaving erratically. Several different things can cause joystick issues, but the most common is a loose or damaged connection.

To fix this problem, first, check all the connections and make sure they’re tight. If that doesn’t work, replace any damaged or frayed wires.

The joystick controller has been known to essentially stop working or barely moving the tractor. There are nuts under the rubber boot that can become loose due to vibrations. Tighten up these nuts, and you should be back in full working order.

Frequently Asked Questions:

Are LS tractors the same as New Holland?

No, LS tractors are not the same as New Holland. They are made by different companies and have different parts. However, many ls mt125 parts are interchangeable with New Holland parts.

How much does an LS MT125 tractor weight?

The ls mt125 tractor weighs approximately 1250 pounds.

What engine is in the LS MT125 tractor?

The ls mt125 has a three-cylinder, 25-horsepower engine.


While ls mt125 problems are common, they’re usually easy to fix. These tractors are tough and built to last, so as long as you take care of them, they’ll take care of you. I would recommend this tractor to anyone in the market for a new one.