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John Deere LT155 Problems and Possible Solutions

John Deere LT155 lawn mowers are an example of their innovations. These mowers are easy to use, powerful and reliable. Don’t worry that you have one of John Deere LT155 lawn mowers if any problem occurs.

The important thing you should know is how to fix the engine so that you can use it the next time at best. For engine starting problems, you should try to pull back and release the primer bulb five times and then check the engine again.

If you face this engine hard starting problem, you can check the compression at first and see whether each cylinder is getting enough compressed air in or not. You can also see whether spark plug wire is grounded properly or not.

If these two problems are ok, then there might be low compression in some cylinders.

These lawn mower problems can sometimes be difficult to diagnose and fix. However, following the step-by-step troubleshooting tips in this guide can help you identify the problem and fix it quickly and easily. Let’s get started.

John Deere LT155
John Deere LT155

Some of the common problems in John Deere LT155

A tractor sounds like a simple machine. It’s basically just a motorized vehicle with wheels and an engine. Yet, the vast number of makes and models out there mean there are hundreds of different problems that can affect your tractor.

The good news is that the most common problems on tractors are easy to fix. If you know what causes them, you can look for signs early enough to do something about it. 

Here are some of the most common problems with John Deere tractors and the reasons:

Engine starting problems: Gas engine hard starting: Tractor cranks but doesn’t start.

Engine runs unevenly: Engine misses at times or is sluggish/dying at idle speed (dieseling).

Engine runs but misses: Engine idles but runs roughly/roughly JD LT155

Hydrostatic Transmission Problems: You’ll fetch sluggish performance.

Engine overheats: Air in system, faulty thermostat, blocked radiator fins, engine coolant leak, blocked water jacket, worn cylinder walls.

Engine does not idle: Choke stuck open, carburetor adjusted incorrectly or dirty/clogged air filter.

Engine knocks: Incorrect fuel mixture, poor compression due to carbon build-up in the engine, out of round piston rings or worn cylinder walls.

Engine starting problems

Make sure that you have checked the fuel strain and it is full. The fuel tank of the machine is fitted with a fuel gauge for convenience. Check your spark plug wires and make sure they are in good condition. 

You can do this by disconnecting them from the spark plugs and checking the continuity, making sure that there are no defects or damages on the wires. Check for any water or air in the fuel system. 

If there is any water, drain it and replace it with fresh fuel. If you are using old fuel, drain the old fuel and replace it again with fresh one. Check your engine oil to make sure that it is clean and free of water, dirt or any other contaminants. 

If all these conditions are not fulfilled, then you might have to get your carburetor cleaned with a good carburetor cleaner.

Hard to Start

The gas engine of your mower is equipped with an ignition key to fire the spark plug. In case there is a problem with the ignition or the spark plug itself, you will have to replace them.

Another cause for hard starting is a loose or corroded connection in the electrical system. The symptom of this malfunction is when you pull the starter cord and it fails to fire.

Other possible factors are old fuel, wrong fuel, and loose throttle cable. To fix this issue, you need to inspect and change wires if required; clean fuel system components; poor quality fuel; check the starter and replace defective components.

The carburetor must be adjusted properly for the engine to run properly, if the carburetor is improperly adjusted the engine will not idle properly or run smoothly. The fuel system components should also be checked for correct operation and checked for obstructions.

The throttle cable should be examined for wear, damage, or improper adjustment. Clean the carburetor and fuel system components and check the operation of the throttle cable before replacing any worn parts.

A failing starter can sometimes cause a hard start but this is usually accompanied by other symptoms such as a clicking sound when attempting to start, slow cranking speed, difficulty cranking when hot, lack of compression.

Hydrostatic Transmission Problems

It’s not unusual for your lawnmower to become sluggish, even to the point of stopping in its tracks. But if it runs fine when you first start up and then stops working within a few minutes, this is a problem that needs to be addressed as soon as possible.

Hydrostatic Transmission of a lawn mower
Hydrostatic Transmission of a lawn mower

The reason for this problem can often be traced to the hydrostatic transmission system, which transfers power from the engines to the wheels. The liquid pressure inside the transmission system rotates the wheels, which drive axle is broken or the metal hose.

Oil viscosity is a common problem. Another problem is the cavitation problem. When cavitation occurs, the system cannot generate pressure and cause failure of other systems such as: drive axle or the metal hose is broken, etc. 

Cavitation is caused by low oil levels or air bubbles in the oil. This causes air pockets to form when you engage or shift gears.

Inefficient transmission of power makes your lawn mower sluggish and hard to push. If you notice your mower becoming sluggish, you should purge your hydraulic transmission system before doing further troubleshooting or calling for service.

You should check the system for damage, clean the pump and add more fuel and check for any leaks in the hoses.

Fuel Pump Issues

The fuel pump on a lawn mower is an integral part of the mower. If your mower has stopped working or is randomly stopping or failing to start up properly, you may need to replace the fuel pump. This can be due to a number of issues such as:

  1. Dirt or debris fill up the tank.
  2. Flow of fuel line is blocked.
  3. Pump is not attached correctly.

Check if it is connected properly by taking an air hose and blowing some air into the oil filler hole to see if there are any leaks or air bubbles coming out of the hose. You can also manually clean the residue from around the fuel tank and check for any blockages within the gas lines.

Steering Problem

A steering problem refers to the inability of the lawn mower to steer easily. There are different reasons that can cause steering problems. The following is a list of problems you may encounter and their possible solutions.

Steering Problem of lawn mower
Steering Problem of lawn mower

If your John Deere LT155 lawn mower is not turning to the left, check the front wheel alignment. Your machine should be able to turn easily by applying force on the handlebar. 

If it is difficult to turn left, there is a good chance that the front wheel alignment needs adjustment. Another possible reason why your John Deere LT155 lawn mower might not turn easily is due to a bent front axle. 

This can happen if you accidentally hit it against an object. You can check for this by looking for scratches on the surface of the axle or if it feels quite loose when you move it back and forth with your hands.

The air filter might be clogged or the battery might be dead. Check the air filter for holes and change it if needed. If the battery is dead, follow your owner’s manual and check instructions for the model of battery you need.


By following all of our John Deere LT155 repair troubleshooting tips, you should be able to fix any problem that may arise with your lawn mower. We have also provided a list of checklists for you to use as you work on repairing your lawn mower. 

This can help prevent damage that could occur if proper procedure is not followed. The best way to keep it in the perfect shape is to regularly check its oil level, tire pressure and cable tension. 

If a part needs replacing, then do so immediately. This will ensure smooth operation and prevent any major problems from occurring at a later stage.

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