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 has a few 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. (See why your pull cord is hard to pull)

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.

Related: John Deere Z930M Problems And Solutions

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 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.

Read: John Deere Gator 835m problems

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.

Troubleshooting John Deere Z915e Problems

Engine Starting Issues1. Faulty fuel system components.1. Inspect and clean the fuel filter, fuel lines, and carburetor. Replace any damaged or clogged parts.
2. Weak or dead battery.2. Check the battery’s voltage and recharge or replace it as necessary. Also, inspect the battery connections for corrosion or loose terminals.
3. Ignition system problems.3. Examine the spark plug, ignition coil, and associated wiring. Replace any faulty components.
Uneven Cutting1. Worn or improperly adjusted mower blades.1. Sharpen or replace dull blades and ensure they are correctly balanced. Adjust the mower deck height to ensure an even cut across the lawn.
2. Irregular tire pressure.2. Regularly check and maintain the tire pressure as per the manufacturer’s recommendations. Ensure all tires have equal pressure to ensure a level cut.
3. Uneven ground conditions.3. Avoid mowing on steep slopes or rough terrain. Use caution when navigating uneven areas to minimize the impact on cutting quality.
Belt Slippage1. Loose or damaged belts.1. Inspect the mower’s belts for signs of wear and tension. Tighten or replace loose or damaged belts.
2. Misaligned pulleys.2. Check the alignment of the pulleys and adjust as necessary. Misaligned pulleys can lead to uneven tension and cause the belts to slip.
Hydraulic System Leaks1. Worn or damaged hydraulic hoses or fittings.1. Inspect all hydraulic hoses and fittings for signs of wear, cracks, or leaks. Replace any faulty components immediately.
2. Loose connections or improper sealing.2. Ensure all connections are securely tightened, and hydraulic lines are properly sealed to prevent leaks.
Electrical Problems1. Faulty wiring connections.1. Carefully inspect the mower’s electrical system for loose, corroded, or damaged wiring connections. Repair or replace any faulty wiring.
2. Malfunctioning switches or relays.2. Test and replace any malfunctioning switches or relays responsible for the electrical issues.
3. Blown fuses.3. Identify the cause of the fuse blowout and resolve the underlying issue. Replace the blown fuse with one of the correct rating.

See Also

John Deere z915e reviews

The Good

  1. Reliable Performance: Many users praise the John Deere Z915e for its consistent and reliable performance. It delivers a smooth and powerful mowing experience, tackling various lawn conditions with ease.
  2. Durable Build: Customers appreciate the sturdy construction of the Z915e. The mower’s build quality and robust materials contribute to its longevity and ability to withstand rigorous use over time.
  3. Comfortable Operation: The Z915e receives positive feedback for its comfortable and ergonomic design. The well-padded seat, adjustable controls, and smooth handling make mowing tasks less tiring, even during extended periods.
  4. Efficient Cutting: The mower’s cutting efficiency and precision are highly regarded. The quality of cut, even on uneven terrain, leaves lawns looking well-manicured, impressing users who seek a professional finish.
  5. User-Friendly Features: Many reviewers appreciate the user-friendly features incorporated into the Z915e, such as the intuitive control layout, easy-to-use height adjustment, and clear instrumentation.

Read: Problems with John Deere 790

The Bad

  1. Expensive Price Tag: One common complaint is the higher price point of the Z915e compared to some competitors. Some users feel that the premium cost may be prohibitive for budget-conscious consumers.
  2. Belt Maintenance: A few customers mention concerns about belt maintenance, reporting occasional issues with belt slippage or wear. While routine maintenance can help prevent such problems, some find it inconvenient.
  3. Service and Repairs: A handful of reviewers express frustration with the availability and cost of parts, as well as delays in servicing or repairs from authorized dealers or service centers.
  4. Limited Comfort Features: Some users expect more comfort features for a mower in this price range. While the Z915e offers a comfortable ride, a few reviewers wish for additional luxuries, such as armrests or a higher-grade suspension system.
  5. Lack of Mulching Capability: A few users note that the Z915e does not come with mulching blades or a dedicated mulching kit, requiring an additional purchase for those who prefer this mowing option.

Overall, while the John Deere Z915e garners many positive reviews for its reliability, performance, and durability, some potential buyers may weigh the cost and specific features against their preferences and needs.

As with any product, individual experiences can vary, so it’s essential for potential buyers to consider their specific requirements and read multiple reviews before making a decision.


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 for John Deere lawn mower 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.

John Deere Z915e Problems Summary

The JD z915e is a reliable hydrostatic mower 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.