7 John Deere D140 Problems and Quick Fixes

John Deere D140 Problems

Mowing grass is an enjoyable exercise if you use the right tools. Luckily, John Deere has a plethora of mowers to choose from.

Unfortunately, most tractors have issues you must learn to sort out to enjoy their services. Thus if you know how to go about john deere d140 problems, then the tractor could be one of the options to consider.

John Deere D140 is a 22 HP tractor with a V-Twin Cylinder engine. Also, the mower features an HST transmission system with massive torque. Thus, the torque makes it the most suitable tool for mowing tasks.

John Deere D140 Problems

  1. Transmission Problems
  2. Starter Problems
  3. Engine Problems
  4. Fuel Problems
  5. Electrical issues
  6. Steering problems
  7. Vibrates excessively

1. John Deere D140 Transmission Problems 

The transmission issue is a common problem in most John Deere lawn tractors. The problem makes the pulley spin without turning the wheels.

This makes mowing difficult since the tractor moves slower than you expect. In some cases, interrupted or broken transmission could cause transmission issues.

It makes the tractor move at a hesitant pace. So when you notice that your lawn tractor cannot retain adequate speed or pull up small hills, it points to a transmission problem.


  • When the tractor moves slower, check the fuel levels and the engine. If the fuel level and the engine are ok, the problem is with the transmission system.
  • When the transmission system’s fluid viscosity and levels are hampered, it fails to transfer movement. So it may require that you replace the fluid. Unfortunately, you cannot replace the fluid, so buying a new transmission system is the only solution.

 2. John Deere D140 Starter Problems

Check the electrical outlet or battery power if the tractor fails to start after pulling the starter button.

If the battery and the electrical outlets are fine but fail to start when you pull the button, the starter could be having an issue.

The tractor may also refuse to start if the spark plug is worn out or the carburetor is wrongly adjusted.

Similarly, clogged fuel lines make it difficult for the fuel to flow to the combustion chamber and so the mower will not start when you pull the starter.

In addition, if the throttle cable is worn out, the tractor will experience starting issues.

Thus, besides the battery, the spark plug, and clogged fuel lines, the tractor may not start if the gasoline is stale or the wires in the starter are damaged.


  • Connect a voltmeter to a solenoid starter’s battery terminal to test the battery. If the battery is faulty, you will need to replace it.
  • If the carburetor is wrongly adjusted, adjusting it could help correct the problem.
  • Replace worn-out throttle cables.
  • If the electrical wires are damaged, check and replace them.
  • If the starter has a problem, inspect and change the defective parts.

3. John Deere D140 Engine Problems

If the mower has Engine problems, it will not follow the commands you give it. This may happen if there is a disruption in the engine mechanism, poor fuel or troublesome fuel pumps.

Any disruption in the mechanism makes it fail. Also, the engine could lose power as a result of overheating.

Overheating happens when the premix gets corrupted or the engine oil is too low. As a result, it makes it hard for the engine to start or run as it should.

If the gas mix is old or the gas is oxidized, the engine loses power, which disrupts the engine mechanism and results in engine problems.


  • If the gas mix is old, consider replacing it. Also, ensure to use gas with less than 10% ethanol. Ethanol-free gas is the best so if you have access to it, use it.
  • A faulty premix could result in engine problems. So to solve it, you may need to drain the gas tank, clean it, and flush out the dirt.
  • Fix the pump and replace the poor fuel.

4. John Deere D140 Fuel Problems

Fuel problems could be caused by a cracked fuel hose, faulty fuel pump, or bad fuel.

Also, accumulated dirt in the primary fuel tank could create a blockage and make it difficult for fuel to move to the combustion chamber.

Also, too much fuel choke is likely to lead to wastage and lead to fuel issues.


  • A fractured gasoline hose could lead to fuel issues. So, if there is, you may need to replace it with a new one. But installing a new horse could be difficult if you have never installed one. Therefore, start by installing the hose to the valve cover at the open end of the base before installing the other end.
  • For blockage problems, remove the hose to allow the fuel to move freely. Blow air into the fuel line to test if it is blocked. Once you see the gas flowing, reinstall the hose. But if the problem persists, drain the existing fuel and check if it has gone bad. Keep an eye on how the fuel trickles down. If the trickling is uneven, the gas is bad and could be the cause the problem. In such a scenario, you only need to replace the fuel to help solve the problem.
  • Consider replacing the air filter.

5. John Deere D140 Electrical Problems

The John Deere 140 tractor could have many electrical issues. Some of the issues may spread out to the starter resulting in a faulty electrical system.

In particular, the spark plugs will likely experience problems you must fix if you want the tractor to operate normally.


  • You can fix the spark plug issue by wiggling it free from the engine and using a wrench or pliers to unclasp it.
  • Use sandpaper to remove debris and dirt from the spark plug.
  • If the spark plug is rusty, replace it with a new one.

6. John Deere D140 Steering Problems

After months of good service, your John deere tractor may get difficult to steer. A loose bolt or worn-out bushings could cause this problem.

Worn-out bushings make engaging the gears difficult. Yet easy gear engagement is necessary for easy steering. Therefore, if the bushings are worn out, it becomes difficult to steer the tractor.

Of course, there are many other causes of steering problems. They include worn-out traction-driven belts, malfunctioned drive sheaves, and won out bench cutting blades.


  • Since there are many causes of steering problems, choose the correct solution to solve the issue. If the steering is too loose or too tight, identify the workout parts and replace them. You may install a new belt and replace the bushings or bolts.
  • If you replace the gears and the bushings but still experience the problem, consider replacing the whole sector plate.

7. John Deere D140 Vibrates Excessively

Mowing with a John Deere d140 is enjoyable if the tractor is in tip-top condition. However, after mowing hundreds of kilometres of grass, you will start feeling that the vibration is too much.

The causes of such vibration could be a worn-out sheave or belt. Also, the tractor may vibrate when the blades are out of balance or if the belt is misaligned.

Other causes include worn-out engine mounting bolts, a bad pulley bearing, unbalanced mower blades, a bad clutch, or a worn deck belt.

In addition, a damaged spindle bearing and collection of debris in the mower could lead to excessive vibration.


  • Check and replace worn-out or defective components such as bad clutch and worn-out engine mounting bolts.
  • Inspect and align the belt or the pulley.
  • If the blades are out of balance, you must balance them to reduce vibrations.
  • Cleaning the sheaves and decks will reduce clogging and eliminate vibration.


What are the main problems with John deere d140?

Although the John Deere 140 has great looks, the tractor is not exempted from problems that afflict mowers in its category. But the main problems you will need to grapple with include engine and transmission problems. John deere tractor shutting off is also another common issue.

What engine does the John deere d140 have

John Deere D140 is fitted with a 22 HP Kohler K321AS engine. This is a powerful engine with a displacement of 512cc31.27ci. The engine has a massive torque that enhances the mower’s capability even when cutting long grass in hilly areas.

How should you store John deere d140 when not in use?

Before you store the mower, you must siphon the gas from the tank. The gas contains corrosive ethanol, which could damage the carburetor if left in the tank. But before you siphon off the gas, add a fuel stabilizer in the tank and run the mower so that you distribute the gas through the system. Turn off the mower, let it cool, and siphon the gas from the tank.


Undoubtedly, cutting grass could be an enjoyable exercise if you use the right mower. So if you can fix john deere d140 problems, then the JD140 mower could be the best option for you.

D140 is an ideal tractor for mowing a large compound since it comes fitted with a 22-horsepower engine with a huge working torque.

Moreover, it comes with a rolled lip 48-inch mower deck that gives it the strength it needs to cut stubborn grass.