John Deere Z925M Problems – Here’s How You Can Fix Them!

The John Deere Z925M is a dependable lawn mower for both homes and businesses. However, like any machinery, it may encounter problems that can affect its performance.

So, what are the John Deere Z925m problems? The common issues include blade shutdown, starting and stalling, and power loss. These issues may stem from various components, including safety switches, PTO clutches, electrical functions, fuel filters, and spark plugs. Furthermore, the carburetor may also cause significant problems for the lawn mower.

Fixing these problems is possible by following our recommended solutions. So keep reading till the end to learn more.

Overview of Problems, Causes, And Solutions

The following table summarizes some major issues associated with the John Deere Z925m lawn mower along with possible causes and solutions. 

1. Blades Shut Down Intermittently Faulty safety switchesRepair or replace depending on the condition
Electrical system problemsReplace faulty fuses and relays
PTO clutch issuesFix the voltage, fuse, and solenoids for proper connections
Engine malfunctionsCheck and fix dirty air filters, clogged fuel filter, and faulty ignition system
2. Start And Die ProblemClogged fuel filter/dirty air filterReplace it
Dirty spark plug –Check and fix dirty air filters, clogged fuel filters, and faulty ignition system
If it’s damaged, replace it
Repair it
3. Power LossClogged air filterCheck the air filter, clean it, or replace it

John Deere Z925m Problems, Causes, And Solutions: Elaboration

Now let’s have a look at the detailed discussion of the issues. 

1. Blades Shut Down Intermittently

Intermittent blade shutdown occurs on a John Deere Z925M when a mower’s blades stop rotating unexpectedly during use. Many reasons can cause it, including-


Here is the solution to these problems.

  • For the safety switch: First, inspect the switch. If there is a functional difficulty, you need to get it repaired by professionals. However, if it’s broken, you need to replace it.
  • For electrical system problems: You may need to inspect the wiring connections and harnesses for any damage. Also, replace any faulty relays or fuses. If necessary, replace any damaged wiring components or have a professional repair the electrical system.
  • For PTO clutch issues: Inspect the clutch and replace any damaged or worn parts. You have to make sure the PTO clutch is getting enough voltage. Check the fuse and solenoid. It’s also important to check the wiring and connections to ensure they’re properly connected. 
  • For engine malfunctioning: Troubleshooting may require inspecting, repairing, or replacing damaged components. It’s advisable to seek professional advice from the manufacturer or an expert for specific guidance on maintenance and repairs.

2. Start And Die Problem

The John Deere Z925M starting and dying problem could be caused by various issues such as a clogged fuel filter, dirty air filter, or malfunctioning spark plug. It’s also possible that there may be a problem with the carburetor or fuel pump. 


It’s basically tough to tell exactly which part is responsible for this issue. You have to perform troubleshooting to locate the source of the problem. Then take proper action.

  • Clogged fuel filter/dirty air filter: Check both your fuel filter and air filter. If you notice that your filters are clogged or dirty, it’s recommended to replace them promptly rather than trying to repair them, as filters are generally not expensive. 

Regularly replacing filters can help maintain the proper functioning of your equipment and prevent potential issues caused by dirty or clogged filters.

  • Dirty spark plug: It is advisable to replace it annually during your John Deere lawn mower service. Although it is possible to clean a spark plug if it appears excessively dart or damaged. 

However, it is recommended to replace it rather than attempt to clean it. Regular maintenance and replacement of parts can help ensure the proper functioning of your mower.

  • Dirty/clogged carburetor: Since cleaning the carburetor can fix these issues, you have to learn how to clean the lawn mower carburetor. Carburetors are expensive components, so it’s better to repair than replace them. If you are unable to do this, call professionals.

3. Power loss

Power losses mainly happen due to multiple reasons. However, one of the most common reasons is dirty air filters. A dirty air filter can restrict the flow of air to the engine. Also, it can result in the engine running too rich, which means there is an excess of fuel and insufficient air. 

This can cause ineffective combustion and, subsequently, reduced power output from the engine.


To solve the issue of a dirty air filter, either clean or replace it as needed. Gently tap and wash it in soapy water if it’s washable. Check the filter regularly to maintain proper airflow and ensure optimal engine performance.

How Much Does It Cost To Repair/Servicing A Lawn Mower?

The exact cost will depend on factors such as the extent of the repair needed, the replacement parts required, and the duration of the repair process. 

In summary, the costs of lawnmower repairs:

  • Fix a malfunctioning starter motor: $200-$400
  • Replace a faulty alternator: $300-$500
  • Repair or replace a damaged radiator: $600-$800
  • Replace a worn-out hydraulic pump: $1,500-$2,500

Final Words

By now, you should have a clearer understanding of the issues that may occur with the John Deere Z925m zero-turn lawn mower. To summarize, this lawn mower may encounter several problems, such as power loss, carburetor complications, and air filter blockages. 

Regular upkeep and cleaning can resolve some of these problems, while others may necessitate professional repairs. If lawn mower owners take good care of their machine and fix any issues that arise, they can ensure that it runs efficiently and works well.

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