5 John Deere Z915e Problems and Quick Fixes

John Deere Z915e Problems

John Deere Z915e Zero-Turn is among the best-performing machine in the zTrak series.

This model boasts heavy duty wheel motors for a stable ride, dynamic braking twin levers, a canister style air filter, and a robust commercial-grade engine.

Moreover, the vehicle offers two seating options: a deluxe comfort seat with armrests and one with isolation.

However, despite its perks, the machine comes with major problems you should beware of. Here are some common John Deere Z915e problems with their fixes.

5 Common John Deere Z915e Problems

Problem 1# John Deere Starting Issues

The most common complaint among John Deere users is the tractor’s starting issues. Typically, this issue occurs as a bad start or the engine failing to start.

You will likely encounter this issue due to a bad fuel grade or air in the fuel system. Similarly, starting problems could arise from spark plug problems, defective fuse, carburetor issues, or disconnected wires.

The fix

Here are some troubleshooting measures for John Deere z915e starting issues; Check the fuel level and refill the tank if needed. The motor will only start when the fuel level is sufficient.

You could also try replacing the entire fuel, especially if it has been standing for a long time. Similarly, moisture in the fuel could prevent the motor from starting.

Next, shift the Neutral lock lever to the Lock position and hold on to the handlebar’s presence control lever while pulling the starter cord.

You can unlock the Neutral lock lever once the engine is running. Alternatively, try cleaning or replacing the spark plug and dual element air filter before starting the mower.

If this still doesn’t solve the issue, remove the air filter and clean it to get rid of oil and debris block that could prevent the mower from starting. Allow the filter to dry before reinstalling it.

Problem 2# John Deere Steering Issues

You may experience steering issues with your John Deere lawn mower for several reasons. The most common culprits are incorrect tire pressure, wheel bearing issues, and slipped steering gear.

When experiencing this issue, you’ll notice that the steering becomes wobbly. This may be due to a bent or broken tie rod. Similarly, the issue could result from a bent or faulty wheel spindle.

For those with John Deere Z445 steering problems, you can also try the solutions below to see if it works.

The fix

You should inspect the tie rod and wheel spindle for any breakages and replace them if necessary.

Similarly, to avoid uneven steering, try loosening the two arms before aligning them to the ideal position. You can then tighten them back.

Alternatively, inspect the mower’s tire pressure using a tire gauge. Ensure it adheres to the specification in the mower’s user manual.

If the pressure is off, inflate or deflate the tire until it matches the ideal psi amount in the manual.

Problem 3# John Deere Hydraulic Pump Failure

Hydraulic pump issues occur when there is a disproportional mixture of air and oil. Typically, the pump fills with air instead of oil.

Consequently, the pump fails to generate enough pressure to provide power. This issue is known as cavitation.

Sometimes, air may enter the pump cavity due to loose connections and leaks. This creates a knocking sound whenever the pump is operating.

Additionally, in the worst scenarios, the temperature of the hydraulic fluid may get too high, becoming less effective.

The fix

You’ll want to perform routine maintenance on the hydraulic system to enhance the pump’s longevity.

Also, try purging the hydraulic drive system to get rid of the air. You should also ensure that the fuel pump meets the California Air Resources Board standards.

Similarly, inspect the connections, hoses, and oil levels often for any faults. By inspecting the components regularly, you prevent bigger issues from building up.

Other common components that tend to fail include the filters, which require regular maintenance.

Problem 4# John Deere Cutting Issue

John Deere mowers usually deliver a nice and clean cut each time you deploy them. However, if you’re using the JD z915e model, you may notice uneven cuts on your lawn, making it less appealing.

This may be due to inconsistent tire pressure and worn or dull mower blades. Similarly, incorrectly installed blades may result in cutting issues from your lawn mower.

Lastly, the issue could lie within the mower’s cutting deck.

The fix

Before adjusting the mower deck, check and ensure the tire pressure level is optimum. With uneven tire pressure, your mower deck may be unlevel.

Typically, the deck reclines on the side with low tire pressure. You can raise and lock the deck in transport position for maximum ground clearance.

In addition, a dull or worn blade may leave strips of uncut grass behind whenever you’re mowing.

Since wear is common and inevitable, sharpen the blades when they become dull or replace worn blades for more consistent cut quality.

A typical sign of excessive wear is when the blade’s sail becomes thinner than the centre.

Similarly, your mower may deliver uneven cuts if the blade is bent or incorrectly installed. Typically, the blade may bend when it comes into contact with a solid object when rotating.

As a result, inspect your yard for tree roots and rocks, among other objects, before embarking on your mowing project.

This precaution will ensure you don’t run into objects that may break or deform your blades. You’ll want to replace the blades entirely if they bend. Please do not attempt to straighten them.

Problem 5. John Deere Z445 Transmission Problems

Like other zero-turn mowers, the JD z915e utilises a hydrostatic transmission system. Typically, this system relies on hydraulic pumps to convert the electric power to mechanical power.

For this reason, you may encounter transmission issues depending on the state of the hydraulic fluid.

Similarly, transmission problems could occur due to mechanical issues in the hydraulic system or a clogged oil filter.

Common transmission problems include;

  • Varying consistency of the oil in the hydraulic pumps.
  • Faulty hose connecting the hydraulic pump to the engine.
  • Varying temperature that alters the oil’s viscosity.

The fix

  • If the mower sits idle, air could fill the pipes, impacting performance. So, purge the mower to get rid of the air.
  • Check all connections in the transmission system for leaks or breaks.
  • Change the hydraulic oil.


What Engine Is A John Deere Z915E?

The John Deere Z915e model relies on an air-cooled, vertical shaft engine rated at 25 hp (18.6 kW)  to operate. In 2015, the brand recalled all its zero-turn mowers of the Z series due to fuel leaking problems.

How Much Does A JD Z915E Weight?

The John Deere z915e model weighs between 1,100 to 1,178 lb. It’s a powerful lawnmower suitable for commercial and residential grade applications. Like other zero-turn mowers, it includes caster wheels that make the mower faster on tight turns.

What Is The Most Powerful Zero-Turn?

Besides boasting the most powerful and reliable engine among competitors, the Husqvarna Z254 zero-turn mower delivers enough torque for mowing large lawns and fields.

This mower includes a 26-hp engine, a convenient cup holder,  and a wide cutting deck measuring 54 inches, allowing you to work on a large area quickly.

What Are The Most Common Problems With Zero-Turn Mowers?

The most common problems you are likely to face with your zero-turn mower include the following;

  • Dull or worn blades.
  • The cutting rows aren’t overlapping.
  • The cutting deck clogs with grass clipping.
  • Slow engine speeds.
  • Insufficient traction on hilly terrains.

What Is The Life Expectancy Of A Zero-Turn Mower?

The average lifespan of commercial-grade zero-turn engines is approximately 3500 hours.

Therefore, you are required to change the oil at intervals of 50 hours to ensure the longevity of your machine.

Typically, you’ll start noticing a decline in power after the unit clocks 2800 operating hours.


The JD z915e is a hydrostatic mower that’s reliable for deployment in mid to large-sized lawns and fields.

While it boasts a powerful engine and long lifespan, several John Deere z915e problems may leave you second-guessing whether to acquire this model.

Fortunately, most of these issues are easy to fix without the intervention of a professional. So check them out and let us know your experience.