John Deere X320 Problems

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When it comes to efficiently mowing your lawn, the John Deere X320 riding mower is sure to do the job outstandingly due to its powerful blades and strong engine.

However, this lawn tractor has certain typical problems that you can experience in the future, just like every other lawn tractor. 

In this article, I talk about these John Deere X320 problems, their causes, and easy-to-follow DIY fixes.

John Deere X320 Problems, Causes, and Possible Solutions 


Before I go into details, let’s have a look at some John Deere X320 problems and their possible solutions.


Possible Solutions

1. Transmission Problems
  • Top up the transmission oil
  • Replace the piston pump seal
  • Purge the transmission system
2. Carburetor Problems
  • Clean the carburetor with carburetor cleaner
  • Seal any leakage opening
  • Adjust the carburetor mix and idle screw
3. Steering Problems
  • Replace the pinion gear and starter gear
  • Seek professional help
4. Electrical Problems
  • Replace blown fuse
  • Recharge the battery 
  • Clean dirty terminals and tighten connections
  • Replace the battery if battery cells are damaged
  • Fix short circuits and replace the light bulb
5. Starting Problems
  • Replace the spark plug
  • Clean the fuel lines/replace the fuel filter
  • Reset the carburetor adjustment settings
  • Repair faulty wiring connections
  • Fix/replace the starter
6. Low RPM Issue
  • Replace the spark plug
  • Clean the air filter
  • Clean the fuel lines
  • Replace fuel filter
  • Drain out the old fuel and refill the fuel tank

1.  John Deere X320 Transmission Problems

The John Deere X320 uses a hydrostatic transmission and it may exhibit some faults or problems over time. You may notice that your mower loses power or the engine runs but the movement is difficult or very slow.

Over time, the piston pump seals in the transmission could deteriorate. The transmission would start to lose power as a result. 

The transmission may also lose power due to a belt problem. This would result in a lack of power at medium range and faster speeds. 

There are occasions when the engine won’t start at all. Misplaced belts or pulleys are the causes of this. If the drive pulley is stripped out of place, the transmission might not function properly.


  • Insufficient transmission oil
  • Worn out pump seals
  • Air contamination
  • Glazed/misplaced belt
  • Damaged pulley


Check the fluid level of your transmission. If the fluid level is too low, top it up, unless the hydraulic system is sealed. If the fluid level is continuously low, the system may be leaking. Look for and repair any leaks in the system.  

If you used the incorrect fluid type, you may need to bleed and replace the oil. Also, replace the oil if it turns milky or black, suggesting water contamination or overheating.

Purge the hydraulic system if there is any air pollution or leakage. After that, check the belt and pulley system for damage and tighten or replace the mower belt or pulley as necessary.

Replace the piston pump seals if they are worn or damaged. This would help stop sudden power loss in your mower.

2. John Deere X320 Carburetor Problems

Carburetors combine air and fuel in precisely the appropriate proportions to maximize power while minimizing fuel usage. They alter the air-fuel mix based on the length of time the engine has been operating, the type of terrain you are crossing, and your speed.

Some symptoms of carburetor problems include engine surging, sudden loss of power, losing power under load, stalling after running for a few minutes, or even refusal to start.


  • Clogged carburetor jets and bowl
  • Oil leaks within the carburetor
  • Carburetor adjustment screws set too lean
  • Dirty carburetor


First, look inside the carburetor to see if there are any evident oil leaks. This might be the main issue. Fix and seal any leaks you notice right away. 

Then, clean the carburetor with a carburetor cleaner focusing on the jets and bowl. You can disassemble the carburetor before cleaning to ensure you clean every hidden part.

Check the screws that modify the idle and main mixtures as well. Replace them if they are broken or damaged. 

Sometimes all they need is a proper tightening and adjusting to allow more fuel into the combustion chamber.

3. John Deere X320 Steering Problems

 The steering is an essential component because it allows you to precisely control your movements. Nevertheless, issues can arise from usage, challenging conditions, or terrain.

The steering mechanism can be put under strain and lose balance if you strike a foreign object like a brick or rock. 

Also, the steering could become out of calibration after repeated use.


  • Damaged pinion gear
  • Faulty sector gear


Under the mower, you will find the pinion gear and sector gear. Over time, they deteriorate and lose their ability to steer the wheels.

Examine the gears for signs of wear and damage, and repair them if necessary.

You should seek the assistance of a qualified lawn mower technician to diagnose and resolve your steering issue if this doesn’t work to prevent accidents and engine damage.

4. Electrical Problems

Your John Deere X320 may encounter some electrical problems such as a damaged starter, refusal of the battery to charge, or the mower light not functioning.


  • Defective fuse
  • Severely corroded and heated-up terminals
  • Low battery voltage
  • Dead battery cells
  • Short circuit
  • Defective light connectors 


A starter that is broken and faulty wiring will make the vehicle refuse to start. If the starter is broken, fix the wiring or replace it.

If the fuse is blown, make sure to change it to a fresh one. Next, check the battery voltage with a multimeter. It is low and has to be charged if it is less than 12 volts.

The battery terminals and wires may be unclean if the battery won’t charge. 

Tighten all connections and clean them. If this doesn’t work, the battery may need to be replaced as some of the battery cells could be destroyed.

Check for short circuits and a damaged light connector if your lights are not working properly, then replace the old light bulb.

5.  John Deere X320 Starting Problems

Your John Deere X320 may exhibit some starting problems such as a refusal to start, a hard start, a slow start, or shutting down immediately after starting.

The reasons for starting difficulty are numerous and you would have to carefully inspect each part to determine the main cause of the problem.


  • Spark plug malfunction
  • Wrong carburetor adjustment
  • Clogged fuel lines/fuel filter
  • Stale fuel
  • Starter problems or damaged electrical wiring
  • Low battery volt


Check the spark plug for burnt ends, broken surfaces, or carbon buildup. If necessary, clean the spark plug or replace it.

If the fuel is stale or has left behind sticky or slimy residue in the fuel tank, drain it out and refill it. 

After that, replace the fuel filter if necessary and clean the fuel lines using carburetor cleaner to clear any obstructions.

The carburetor may be adjusted too leanly, letting only a tiny amount of fuel into the engine, if the engine starts and stops abruptly. Set the carburetor so that there is enough fuel flow.

Additionally, make sure the carburetor is clean and, if it isn’t, use a carb cleaner to clean the jets and bowl.

If your vehicle has a faulty starter or poor wiring, it will refuse to start. Check for bad wiring or replace the starter if it is damaged.

Finally, check to see that the battery is producing 12-12•5 volts. If it isn’t, charge the battery or replace it with a new one if it is damaged.

6. John Deere X320 Low RPM Issue

Some users had issues with low RPM at wide-open throttle (WOT). The engine does rev up, but not in the usual quick and sharp way. It behaves more like a sluggish motor.


  • Faulty spark plugs
  • Stale fuel
  • Clogged fuel lines/fuel filter
  • Clogged air filter 


The main cause of low RPM is a faulty or poorly adjusted spark plug. Inspect the spark plug for dirty ends, carbon build-up, burnt or darkened electrodes, and replace it if it is worn out. 

If the spark plug is good, it may be adjusted poorly. Connect the spark plug firmly to the wire so that it is firm and not wobbling about.

Another cause is old or contaminated fuel. If the fuel has been left in the mower while it was stored over the winter or while the mower has remained unused, drain it and replace it with fresh fuel.

Check the air filter to ensure that it’s not blocked with dirt and debris. If it is, wash or replace the filter with a new one. 

Additionally, inspect the vented gas cap. Clearing either of these problems will stop the reduced or erratic airflow so that they can both produce enough power.

What Majority Of Users Feel About The John Deere X320

The majority of the users of John Deere X320 stated that the riding mower was very sturdy, super powerful, and very easy to start.

They also loved how easy it was to control and understand. It was also simple to perform routine checks and clean the mower because of how accessible the parts are.

Most of the complaints about the John Deere X320 are problems also found in other riding mowers and I have addressed them in this article and provided simple solutions to solve them.


The John Deere X320 is a very versatile mower with numerous features. Despite its dependability, you may occasionally encounter the aforementioned John Deere X320 problems.

I have covered all of the major components as well as some simple fixes that you can carry out yourself. 

If you still can’t resolve these problems after following this guide, reach out to a professional small engine technician.