John Deere x300 Problems (Reasons + Solutions)

John Deere has some of the best riding lawnmowers in the market. Needless to say, you want the best for you. This is why you might opt for the x300 series. 

But before you make any decision to buy, you gotta be aware about John Deere x300 problems. 

Most common John Deere x300 problems are:

  • Engines not starting or stopping
  • Transmission issues
  • Battery connections
  • Fuse box
  • Positive cable.

If you find any problem, these are what it’s supposed to be. With that said, continue to find the sources of these problems and how to solve it. 

John Deere x300 Engine Problems

The majority of John Deere x300 problems are due to the engine. It can be either in the starting or during using the tractor itself.

Engine Not StartingCorroded battery terminals
Damaged choke cable
Defective Ignition System
Repair and replace battery terminals.
Replace the spark plug.
Engine Stops SuddenlyClogged or dirty fuel pumpClean fuel pump.
Engine OverheatingUnclean air filter
Broken cooling fan
Clean air filter.
Replace cooling fan.

This table clearly shows that the problem is due to different reasons like the damaged battery or unclean air filter. More explanation along with the solution comes next:

Problem 1: Engine Not Starting

John Deere x300 starting problems is one of the most common. It can happen if the battery terminals are not working properly. But a faulty ignition system can also compromise the engine’s starting ability. 

With that being said, there are many ways to solve this problem. Some of these are explained below: 

Solution 1: Clean Battery Terminals 

Start by looking for corrosion in the battery terminals. It resembles a crust-like formation around the terminals. 


  • Wrench
  • Battery Cleaner Spray
  • Wire Brush
  • Battery Terminal Protectant Spray

The following are the steps:

  • Step 01: Pop the hood and locate the battery terminal.
  • Step 02: Disconnect the battery cables starting with the negative (-) cable using a wrench.
  • Step 03: Keep both the cables separated.
  • Step 04: Spray all over the corroded surfaces using the cleaner spray. 
  • Step 05: Use the wire brush to remove the corroded build-up.
  • Step 06: Rinse it with water.
  • Step 07: Spray all over the surface with Battery Terminal Protectant spray. 
  • Step 08: Connect back the battery cable and run the engine.

Solution 2: Replace Battery Terminals


  • Wrench
  • Wire Brush

The following are the steps: 

  • Step 01:  Pop the hood and locate the battery terminal.
  • Step 02:  Disconnect the battery cables. 
  • Step 03:  Keep both cables separated.
  • Step 04:  Lift the battery off the battery tray.
  • Step 05:  Look for any corroded surface and clean it.
  • Step 06:  Put the new battery into the battery tray.
  • Step 07:  Connect all the cables starting with the positive (+) one.
  • Step 08:  Close the hood and start the engine.

Solution 3: Replace the Spark Plug


  • Wrench
  • Spark Plug Socket

Following are the steps for replacing a spark plug:

  • Step 01:  Turn off the engine.
  • Step 02:  Remove the spark plug wire.
  • Step 03:  Use the Spark Plug socket to loosen the spark plug. 
  • Step 04:  Remove the spark plug.
  • Step 05:  Remove the other spark plug in a similar manner.
  • Step 06:  Put the new spark plug and tighten it.
  • Step 07:  Start the engine.

Solution 4: Jump Star with Your Lawnmower

All of these are good strategies. But what if you don’t have a new battery or the time to replace it?


  • Jumper Cables

Here are the steps:

  • Step 01:  Check whether the lawn mower battery voltage are same or not. It must be similar.
  • Step 02:  Turn off your mower engine.
  • Step 03:  Park the lawn mower on level ground and engage the parking brake.
  • Step 04:  Connect one end of the positive (red) jumper cable to the positive terminal of the mower battery.
  • Step 05:  Connect the other end of the cable to the positive terminal of the mower battery.
  • Step 06:  Connect one end of the negative (black) jumper cable to the negative terminal of the mower battery.
  • Step 07:  Connect the other end of the cable to the engine block.
  • Step 08:  Turn the engine of the mower.
  • Step 09:  Disconnect everything starting in the reverse order. 

Problem 2: Engine Stops Suddenly

Imagine starting your tractor and getting on with the day’s work. But suddenly it stops and comes to a standstill. This is one of the most common problems of John Deere x300.

It happens whenever there is any problem with the fuel pump. Whether it is a clogged or damaged fuel pump, the engine comes to a stop.


It can be solved by replacing the fuel pump. Following are the steps:

  • Step 01: Remove the hood.
  • Step 02: Locate the fuel pump.
  • Step 03: Remove the spark plug cap.
  • Step 04: Remove the hoses connected to the pump.
  • Step 05: Loosen the bolts in the pump.
  • Step 06: Pull the pump off.
  • Step 07: Connect the new pump.
  • Step 08: Reconnect everything back.

Problem 3: Engine Overheating

Engine overheating is a severe problem that can completely damage the tractor. It happens due to reasons related to air filters and cooling fans. 


This problem can be solved by changing the cooling fans and the air filter. You can seek professional help for both of the processes. 

John Deere x300 Transmission Problems

John Deere x300 transmission problems are due to fault in the gear system. Any problem in shifting the gear makes your tractor stuck.

It can be solved by changing the gear system. Although it is possible to do it yourself, I recommend seeking professional help for this. 

John Deere x300 Fuel Problems

Having a good fuel economy is helpful both for your tractor’s performance and the environment. But sometimes problems with consumption and exhaustion happen:

Too much fuel consumptionDamaged or dirty carburetor
Insufficient throttle opening
Clean fuel filter.
Replace carburetor.
Change the throttle cable.
Black Exhaust SmokeDirty fuel filter
Damaged carburetor
Improper throttle engagement
Clean fuel filter.
Replace carburetor.
Change throttle cable.

So, faulty fuel systems can cause such fuel problems. Now, you need to know what are the steps to stop this problem.

Problem 1: Too Much Fuel Consumption

It happens when the carburetor is dirty or busted. Insufficient throttle opening is another reason.

Solution 1: Replace the Carburetor


  • Ratchet
  • 10mm socket

Following are the steps of replacing the carburetor:

  • Step 01: Remove the hood.
  • Step 02: Disconnect spark plug.
  • Step 03: Locate the carburetor.
  • Step 04: Take off the air filter cover.
  • Step 05: Remove the air filter.
  • Step 06: Disconnect the solenoid. 
  • Step 07: Remove the hose off the carburetor.
  • Step 08: Remove the throttle and choke cables off the carburetor.
  • Step 09: Remove all the bolts from the carburetor housing.
  • Step 10: Remove the carburetor housing.
  • Step 11: Remove another hose from the carburetor.
  • Step 12: Remove the carburetor.
  • Step 13: Put in the new carburetor.
  • Step 14: Connect everything back from the hose to the spark plug.
  • Step 15: Put the hood back on and start the engine.

Solution 2: Clean the Carburetor


  • Wire Brush
  • Screwdriver
  • Carburetor Choke Cleaner

Following are the steps of cleaning the carburetor:

  • Step 01: Remove the hood and locate the carburetor.
  • Step 02: Remove it.
  • Step 03: Clean the surrounding with wire brush.
  • Step 04: Take the bowl off from the bottom of the carburetor.
  • Step 05: Discharge all the residual fuel from the bowl.
  • Step 06: Disassemble the top plate.
  • Step 07: Remove the gasket.
  • Step 08: Clean the remaining part using the choke cleaner and the wire brush.
  • Step 09: Assemble back everything.
  • Step 10: Put the carburetor back. 
  • Step 11: Connect everything else to the carburetor.
  • Step 12: Start the engine.

Solution 3: Change Throttle Cable


  • 10mm socket
  • 5/16 socket
  • Screwdriver

Following are the steps of changing a throttle cable:

  • Step 01: Remove the hood from the riding mower.
  • Step 02: Remove the cover. 
  • Step 03: Loosen the mounting clamp using a 10mm socket.
  • Step 04: Locate the connection of the cables in front of the mower.
  • Step 05: Loosen the screw holding these cables.
  • Step 06: Remove both the cables from the front.
  • Step 07: Push the tabs in the throttle cable assembly using screwdriver.
  • Step 08: Bring out the throttle cable assembly. 
  • Step 09: Insert the new throttle cable assembly from the spot you took out the previous one.
  • Step 10: Reconnect both the cables at the front by tighten with the screw.
  • Step 11: Push the throttle lever and check whether it touches the stop screw.
  • Step 12: Connect back the cover and the hood.

Problem 2: Black Exhaust Smoke

If you notice black exhaust smoke from your tractor, wait for a bit. Check if it happens continuously or not. Because if it does, that’s when the tractor’s fuel system is damaged.

Again, a damaged carburetor and an unclogged fuel filter are some of the reasons for this problem. Following are the solutions for black exhaust smoke:

Solution 1: Replace the Fuel Filter

John Deere recommends changing the fuel filter every year.


  • Pliers

Following are the steps for cleaning a fuel filter:

  • Step 01: Pop the hood and locate the fuel filter.
  • Step 02: Inspect the direction of fuel flow. 
  • Step 03: Remove the retaining clip on the top using pliers.
  • Step 04: Remove the bottom retaining clip.
  • Step 05: Twist and pull out the fuel filter.
  • Step 06: Put the new fuel filter in the place. 
  • Step 07: Reinstall the retaining clips.
  • Step 08: Wipe off all the spilled residual fuel.
  • Step 09: Start the engine and check for any leaks.

Solution 2: Replace or Clean Carburetor

Replace and clean the carburetor as mentioned above.

Solution 3: Change Throttle Cable

Change the throttle cable as mentioned above.

John Deere x300 Other Problems

Some other John Deere x300 problems could be related to vibration, mower deck or steering. Following is the tabular representation of that:

Too much Vibration Problem with the blade
Wrong position of parking brake
Disengage parking brake and bypass valve lever.
Mower Deck ProblemsLoose belts
Worn out belts
Tighten the belt.
Replace belt.
Steering ProblemsProblem with the gearChange gear.

The reasons here range all the way from worn-out belts to problems with installation. But with each problem, comes its own solution.

Problem 1: Too Much Vibration

It is either due to a problem in the position of the blade or the parking brake. The best part is that you can solve it easily by yourself. 


The problem with vibration can be solved by just disengaging the parking brake and the bypass valve lever. 

Problem 2: Mower Deck Problems

If you find any problem controlling your mower deck, it can be due to problems in the belt. 


Following are the solutions to John Deere x300 belt problems

Solution 1: Tighten the Belt


  • 10mm Wrench

Following are the steps to tighten the belt on the Mower Deck:

  • Step 01: Turn off the engine.
  • Step 02: Pull the lever towards you.
  • Step 03: Locate the spring near to the belt.
  • Step 04: Locate the cable bracket near to the spring.
  • Step 05: Loosen the bolts connecting the bracket.
  • Step 06: Pull the bracket towards you.
  • Step 07: Tighten the bolts.
  • Step 08: Engage the levers by turning. 
  • Step 09: Check the belt and spring to see if it is tight or not.

Solution 2: Replace the Belt 

However, while inspecting if you find any crack or signs of wearing out in the belt then you need to replace it. 

Due to its complicated nature, I recommend consulting a professional for this.

Problem 3: Steering Problems

John Deere x300 steering problems are not turning or getting stopped abruptly. Either way, it happens due to a problem with the gear.


To solve this you need to change the gear. But it is not that simple. In fact, due to its complicated nature, I recommend consulting a professional for this unless you have experience working with gears. 

So, these are the main problems related to John Deere x300 along with the solutions. 


What is the voltage of the battery in a John Deere X300?

The John Deere X300 has a 12-volt battery. A fully charged and good-conditioned battery should have 12.6 volts.

How often should I change the air filter in John Deere x300?

John Deere recommends you change the air filter every 50 hours or once a season. Although the changing frequency depends on how often you use your mower. 

Why is there an uneven cut on the grass after using John Deere x300?

It happens when the mower blade is worn out or bent and if the mower deck is not leveled correctly. You can solve it by replacing the blade and fixing the mower deck belt. 


So that sums up all the key John Deere x300 problems. I hope that you got all the information you need.

If you need us to write about something else, comment below.

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