John Deere X485 Problems

The John Deere X485 is a lawn tractor that was produced by the John Deere company from 2003 until 2005. 

The X485 is part of the Select Series of lawn tractors, which were designed for homeowners with larger yards who wanted more power and features than what the standard series could offer. 

Despite its higher price tag, the X485 still suffered from some of the same problems as other John Deere lawn tractors.

So, in this blog post, we will discuss some of the common John Deere X485 problems and solutions.

John Deere X485 Problems

John Deere X485 Problems

1. Engine not Starting

There are several reasons why the John Deere X485 engine might not start. The most common reason is that there is no gasoline in the tank. 

Other potential reasons include using the wrong fuel grade, stale gasoline, dirty fuel lines, a defective spark plug, or a dirty fuel filter. 

Another possibility is that the carburetor is not adjusted correctly. 

Finally, compression problems could also be preventing the engine from starting.

How to Fix

If the engine fails to start, there are several things that could be the problem. The first thing you should do is check the fuel level in the tank and make sure it is full. 

You should also make sure that you are using the correct fuel grade for your John Deere X485 tractor. 

If the tractor has been sitting for a while, you may need to drain the gasoline and refill it with fresh gasoline.

You should also inspect the ignition spark and replace the spark plug if it is not working. You should also inspect and clean the air filter and replace it if needed. 

You should also adjust the carburetor idle mixture screw if necessary. Finally, you should check and adjust the governor linkage if necessary.

2 Engine Running Roughly

This is another common problem that a number of John Deere X485 owners are reporting. However, this is not a really complicated problem. 

There are several reasons why the John Deere X485 engine might be running roughly. 

Some common causes are clogged cooling fins, loose electrical contacts, ignition adjustments incorrectly, choke cable sticking, and air filter blocking.

How to Fix

To fix a John Deere X485 engine running roughly, you will need to clean the cooling fins, inspect and replace defective contacts, and choke cable sticking. 

You may also need to check the spark plug and ignition and repair or change them as needed. 

Finally, you will need to clean or replace the air filter.

3. Engine Overheats

Engine overheating is also a common problem in John Deere mowers. 

You should fix this problem as soon as possible because this can completely damage the engine.

Reasons why John Deere engine might be overheating:

-Engine overloaded

-Air intake screen clogged

-Too little or too much oil

-Incorrect engine oil viscosity

-Inspect crankshaft to main bearing clearance

-Fast idle speed

How to fix

If the John Deere X485 engine is overheating, there are several possible causes. The first step is to reduce the load on the engine. 

You can do this by removing some of the attachments, such as the mower or blade. If the air intake screen is clogged, clean it using a brush or compressed air. 

If the oil level is too low or too high, adjust it to the correct level. 

If the engine oil viscosity is incorrect, change it to the recommended level.

Finally, inspect the crankshaft to main bearing clearance. If it is too large, adjust it to the correct size.

4. Engine Knocks

There are several reasons why the John Deere X485 engine might be knocking. One reason might be because the octane rating of the gasoline is too low. 

Another reason could be that the engine is overloaded, or that there is a lack of engine oil. 

The engine speed might also be too low, or the cylinder bore and rings might be worn. 

The cooling fins might also be plugged, causing the engine to overheat, or there may be loose or worn connecting rods.

How to fix

If you are experiencing engine knocking, the first step is to change the gasoline. You can also reduce the loads on the engine by adjusting the blades or removing the bagger. 

You should also check the oil level and add oil if necessary. If the engine speed is too low, you can adjust it accordingly. 

Also, if the cylinder bore and rings are worn, you will need to replace the damaged parts. 

You should also check for engine overheating from plugged cooling fins. 

Finally, you may need to adjust the crankshaft end play. You should also check for loose or worn connecting rods.

5. Kawasaki Engine Backfires

There are many reasons why Kawasaki engines might backfire, some of which include:

  1. A dirty air filter
  2. Too much oil in the engine
  3. A spark plug that is not firing correctly
  4. An ignition coil that is not functioning properly
  5. A fuel line that is blocked or leaking

How to Fix

First, check the spark plugs and adjust or replace the choke as per need. Then test the carburetor and adjust it if necessary. 

Finally, inspect and adjust the ignition coil air gap, and check for sticking valves. 

If any of these need to be adjusted, do so and then check the flywheel key.

6. Mower Smoking

It’s likely that the air cleaner element is plugged in, which is causing the smoke. You’ll need to inspect and clean it. 

It’s also possible that the choke is partially engaged, so you’ll need to inspect and adjust it. 

Finally, you’ll need to check and adjust the carburetor float level. 

If this doesn’t solve the problem, then you may need to replace the carburetor.

7. Too much Vibration

There are several reasons why a mower might vibrate too much. One reason might be that the blades are bent or out of balance. 

Another reason might be that there is too much dirt on the drive sheaves, which can cause the belt to slip. 

A third reason might be that the traction drive belt is damaged and needs to be replaced.

How to fix

If the mower vibrates too much, it may be due to a damaged belt or traction belt. To check for a damaged belt, inspect the drive sheaves for dirt and debris. 

If there is dirt on the drive sheaves, install a new pulley. 

If the blades are bent or out of balance, change them as needed.

8. Use a lot of Oil

There are several reasons why a mower may consume a lot of oil. One possibility is that the engine is not getting enough oil. 

This could be due to an improper oil level or a faulty oil pump.  

Additionally, if the air filter is dirty or clogged, it will reduce the amount of air that reaches the engine, leading to a decrease in power and an increase in fuel consumption. 

Finally, if there is excessive blade wear, it will cause more metal particles to enter into the engine and contaminate the oil.

How to fix

If your mower is consuming a lot of oil, you may need to adjust the throttle cable. 

Also, make sure the carburetor is working properly by checking the float adjustment.

9. Leave Uncut Grass

There are several reasons why John Deere X485 might leave uncut grass. 

One reason might be that the blades are not sharp enough, so you should check for blade damage and replace if necessary. 

Another possibility is that the deck is too low from the ground, so you should level it. A third reason might be that the bagger is too full, so you should empty it. 

Finally, if the speed is very high, you should use a lower speed.

How to fix

The first thing you should do is sharp the blades if this doesn’t fix the problem then replace them. 

If the deck is too low then you should level it.

And last thing you should do is remove the grass and dirt from the bag.

10. Belt Slipping

Another common problem that people are facing is that their mower belt keeps slipping. 

These are the main reasons why your mower belt might be slipping.

  • It may be due to debris in the sheaves or incorrect belt tension.
  • Belt can be loose.
  • And maybe the belt tension may be incorrect.

How to fix

These are things that you can do to fix the belt slipping problem.

  • Clean the belt sheaves.
  • Tight the belt.
  • And correct the belt tension

If these things don’t fix the problem then you should buy the new belt.

What are People Saying about John Deere X485?

People are saying that the John Deere X485 is a great tractor. It has a lot of features that make it a great choice for farmers and landowners.

Some of the features include:

  • A powerful engine that can handle a lot of work
  • An easy-to-use transmission that makes it easy to operate
  • A comfortable cab that provides a great driving experience

Overall, people are very happy with the John Deere X485 tractor. It is a great choice for anyone looking for a tough, reliable tractor.


The John Deere X485 is a great tractor for those looking for a powerful and versatile machine. 

However, like all tractors, it is not without its problems. Some common issues that owners have reported include engine problems, transmission problems, and cutting problems. 

While these problems can be frustrating, they can usually be resolved with the help of a qualified technician. With proper care and maintenance, the John Deere X485 can provide years of reliable service.

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