9 Most Common John Deere LT155 Problems & Solutions

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By Marvin Tucker

Farming Equipment

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John Deere is a trusted name in lawn care, and the LT155 is one of their most popular models.

The John Deere LT155 is a lawn tractor produced from 1998 to 2002. It featured a hydrostatic transmission, a 42″ mower deck, and 16hp Briggs & Stratton engine.

The John Deere LT155 is a versatile and reliable lawn tractor built to last. However, like all machines, it’s not without its share of common problems. 

Some of the most commonly reported issues with the LT155 include clogging, overheating, and failure to start.

Below are some of the most frequent problems with the John Deere LT155 and what you can do to fix them.

The Most Common Problems with John Deere LT155

The John Deere LT155 is a workhorse of a lawn tractor, but like any machine with moving parts, it is susceptible to problems.

So despite being a reliable machine, there are a few common problems that owners have experienced with this tractor. Let’s explore some of those issues and provide potential solutions.

1. Engine Surging

One common problem with the John Deere LT155 is engine surging. A few things, including dirty fuel, carburetor problems, or an issue with the ignition system, can cause this.

If you’re experiencing engine surging, here are a few things you can try:

  • Clean or replace the fuel filter. A dirty fuel filter will reduce the fuel flowing into the engine, causing it to run skinny and surge.
  • Clean the carburetor bowl. Over time, dirt and debris can accumulate in the carburetor bowl, causing the engine to run lean and surge
  • Check the spark plug and ignition system. If the spark plug is fouled or the ignition system is not functioning correctly, it could result in the engine surging. 

2. Lawn Tractor Won’t Start

Another common problem with the John Deere LT155 is that it won’t start. Several things can cause this issue, including a dead batterya bad spark plug, or contaminated fuel.

The battery should be checked as soon as your John Deere LT155 doesn’t start. You will need to replace the battery if it is dead. If the battery is not the problem, it could be an issue with the fuel filter or pump.

To check the fuel filter, remove it and hold it to light. If you cannot see the light passing through it, it needs to be replaced. To check the fuel pumpremove the gas cap and listen for a hissing sound. 

It might be necessary to replace the fuel pump if you don’t hear a hissing sound.

You should also check the spark plug. A bad spark plug will prevent the engine from starting. 

3. Mower Won’t Cut Grass

If your John Deere LT155 mower doesn’t cut grass, several possible issues could be causing the problem.

First, check to see if the blades are dull or damaged. If they are, then they will need to be replaced. Another possibility is that the mower deck needs to be level.

To check this, park your John Deere LT155 on a flat surface, then measure from the ground to the edge of the mower deck at all four corners. Adjust the leveling screws until all four measurements are equal.

Finally, ensure the mower deck belt is not damaged or loose. If it is damaged, it will need to be replaced. If it is loose, tighten all the bolts that secure it.

4. Transmission Won’t Engage

If your John Deere LT155 transmission doesn’t engage, there could be an issue with low hydraulic fluid levels or a damaged hydraulic pump.

Locate the dipstick on the side of the gearbox housing and pull it out to check the hydraulic fluid level. Use a clean cloth to wipe the dipstick and reinsert it into the transmission housing.

Remove it again and check to see where the fluid level falls on the dipstick (it should be between “FULL” and “ADD“). If it is below “ADD,” you will need to add hydraulic fluid until it reaches “FULL.”

If adding hydraulic fluid does not solve the problem, then there could be an issue with the hydraulic pump, and you will need to have it repaired or replaced by a qualified technician.

Also, if your mower deck won’t engage, you should ensure the PTO switch is turned on before starting the engine. If it is, then check for any broken or damaged belts. 

If the belts are in good condition, ensure all spindles are free from debris and moving freely. Lastly, check for any bent or broken blades. 

5. Engine Runs Roughly 

Numerous problems could be the cause of your engine’s poor operation.

Check the air filter to see whether it needs to be replaced before doing anything else. Also, check the spark plug and gap. Next, clean out the carburetor bowl and jets. Lastly, check the fuel line for leaks. 

For the air filter, you should replace it every 6 months or so, depending on how often you use your john deere lt155.

Ensure the spark plug is correctly gapped according to the specs in your owner’s manual. If not, you may need to replace the plug entirely.

To clean out the carburetor bowl and jets, remove the carburetor from your john deere lt155. Once removed, use a soft-bristled brush to gently clean out any clogs or blockages in the jets and bowl.

Finally, check your fuel line for leaks by inspecting its connection points with the engine. If you notice any signs of leakagetighten or replace the fuel line as necessary.

With these simple steps, you should be able to get your john deere lt155 running smoothly once again.

6. The mower deck on my John Deere LT155 is not level.

If the mower deck on your John Deere LT155 needs to be level, various issues could be the cause.

One potential cause may be that the suspension system for the back wheels is damaged or broken. Make sure to check and see if there are any signs of damage or wear, and if so, replace the suspension system as needed.

Another potential issue may be that the front wheels need to be fixed in their wheel wells. If so, you must make the necessary adjustments to align them correctly.

If you have followed the above instructions and your mower deck is still unlevel, then there may be a problem with the deck itself. 

In this case, you will need to take your John Deere LT155 to a certified mechanic so they can inspect the mower deck and perform any necessary repairs.

7. Mower Deck vibrates excessively 

If your mower deck vibrates excessively, it could be due to different issues.

  • First, ensure all the blades are installed correctly and are tight.
  • Then, check for any bent or damaged blades and replace them if necessary.
  • Next, check all of the spindles for debris and damage.
  • Lastly, check the mower deck for unevenness or warping. 

8. Mower Leaves Strips 

If your mower leaves strips while mowing, it could be due to different issues.

First, ensure that all the blades are installed correctly and are sharp. If they’re dull, sharpen or replace them as needed.

Next, check the mower deck for unevenness or warping and adjust accordingly.

Finally, ensure that you’re mowing at the correct speed – too fast and you’ll scalp your lawn; too slow and you won’t cut evenly. 

9. Mower Won’t Self-Propel 

If your mower won’t self-propel, first make sure that there’s no debris caught in the drive wheels or axle shafts preventing them from turning freely.

Next, check for any broken or damaged belts. If any are damaged, replace them as needed.

Finally, ensure that all drive controls are properly engaged and adjusted, and all the linkages are connected correctly and moving freely.

John Deere LT155 Problems: Are they a deal breaker?

The John Deere LT155 is a reliable lawn tractor that can ensure years of smooth function by providing proper care and maintenance. However, like all machines, it is not without its problems.

In this blog post, we looked at some of the most common problems with the John Deere LT155 and what you can do to fix them yourself.

We discussed issues with the mower deck, how to level it if needed, and tips on troubleshooting common problems with its blades and spindles.

We also discussed common problems with the fuel linetransmission, and self-propulsion, along with tips on addressing these issues yourself.

If you’re still having trouble after trying these solutions, take your tractor to an authorized John Deere dealer or service center for assistance.

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