John Deere Z520A Problems

Most Common John Deere Z520A Problems and Quick Fixes

The John Deere Z520A is a powerful and efficient zero-turn mower that can make quick work of even the toughest lawn mowing jobs. However, like any piece of machinery, the Z520A is not immune to problems.

So, what are the most frequent issues observed in John Deere Z520A? Excessive vibration due to broken bolts, uneven mowing, and tire slipping are some of the most common problems the Z520A lawnmowers encounter.

In this article, we’ll explore some of the most common issues owners of this model face and provide solutions to help keep your lawnmower running smoothly.

Problems With John Deere Z520A and Solutions At a Glance

The John Deere zero turn mower Z520A model is specially designed for contractors who need a large area to mow. However,  this heavy-duty model may also face some issues, which are described right below-

Broken or loosened engine boltReplace or secure the engine bolt tightly
Tire slips in certain directionInflate or deflate the opposite tire, add quick attach weights
Uneven mowingCheck the deck for debris, and worn blades, and level the deck

1. Missing, Broken, or Loosen Engine Mounting Bolt

The main function of Engine bolts (also called motor mounts) is to decrease vibration while running or steering. But, sometimes, this may break or lose. As a result, you will experience overwhelming vibration.

Engine bolts may lose due to overusing without maintenance. Sometimes if you hit hard objects, there remains a risk of crashing. Either case, you’ll lose steering balance and figure out that your mower is shaking excessively.


You can solve the issue by following these steps below:

  • 1st Step: Inspect the Bolt. Using a push mower, check the motor mounts when you feel excessive vibration.
  • 2nd Step: Secure the bolt if it’s loose.
  • 3rd Step: If it’s a broken or missing case, you must replace it with a new one. It may cost about $80 only.

2. Tire Sleeping

Some lawn mower users report a peculiar issue with John Deere z520a- right tire slips. Thinking simply,  it could be due to the left front tire’s low inflation. But,  sometimes, math requires a bit of a difficult equation. You may examine the left tire and end up with nothing in the left, still right tire slips.

Then, it might be due to the unequal distribution of balances. The left side of the tractor is heavier as it contains a gas tank. Balance irregularity is a common problem in John Deere 500 and 800 series.


First, try to figure out if there’s any pressure difference between the right and left tires. To do so, measure the pressure of each tire using a tire gauze. Then either release or inflate. Make sure all of the tires are inflated at 15 psi.

If it doesn’t help, you can add quick attach weights on the right rear side of the mower.

3. Uneven Mowing

Uneven mowing is a common problem with zero-turn mowers, and the John Deere Z520A is no exception. If you notice that your Z520A is leaving behind patches of uncut grass, there are a few things that can cause it-

  • Specks of Dirt obstructing the blade
  • Worn or damaged blades
  • Tilted deck


Fixes vary according to the cause.

  • Start with checking for any debris build-up. If present, clean it!
  • If the blade gets damaged, replace it.
  • Use a leveling tool to make sure that the deck is not tilted in any direction.

Watch the following video! Here, this guy explained what issues he faced while using JD Z520A. It will clear your doubts.

Final Words

After learning about the faults and fixes for john deere Z520A problems, it is your responsibility to address them and examine the parts before it is too late.

Please follow recommended maintenance procedures to prevent the emergence of John Deere Z520A issues. This could involve checking the bolts, bearing, and tie rod to see whether they’re wearing down. Also, changing the oil regularly, replacing the air filter, and routinely cleaning the deck and engine residue should be done.

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