Why Is Husqvarna Zero Turn Won’t Go Forward or Reverse?


Is your Husqvarna zero turn mower refusing to budge in any direction? It can be frustrating when your trusty machine won’t go forward or reverse. But worry not! There are solutions according to the problems.

Generally, the common causes for Husqvarna zero turn not moving are worn drive belts; hot, old, or low hydraulic fluid; trapped air in the hydraulic system. Other culprits are missing axle key, broken spring, damaged tensioner pulley, etc. 

Whether it’s a mechanical glitch or an electrical hiccup, I’ll help you troubleshoot and troubleshoot, so you can get back to taming your lawn in no time. Let’s dive in and uncover the secrets of why your Husqvarna zero turn won’t go forward or reverse.

Why Does My Husqvarna Zero Turn Won’t Go Forward or Reverse?

Why Does My Husqvarna Zero Turn Won’t Go Forward or Reverse

Learning the root cause of a problem is always beneficial to finding solutions. So, when you are stuck with your Husqvarna zero turn in the lawn, the first question that might come to your mind is,

Why is it happening?

Several culprits are there, Whether the Husqvarna zero turn won’t go forward or reverse or vice-versa. Such an incident makes the mowing session frustrating.  

Here are the possible causes.

  • Broken or loose drive belt
  • Faulty or unresponsive bypass lever
  • Missing axle key
  • Faulty tensioner pulley
  • Missing spring of the idler arm
  • Hydraulic fuel is heated
  • Trapped air in the hydraulic system
  • Blocked fuel system
  • Rusted terminals in the defective battery

Read Also: Husqvarna Zero Turn Moves Slow – Why & How to Fix?

How to Solve Husqvarna Zero Turn Won’t Go Forward or Reverse?

So, you learned the reasons behind the problem and are looking for solutions, right?

Happily, the solutions are simple. However, before proceeding, it is crucial to maintain a few precautions, which are,

  • Disconnect the spark plug
  • Turn the engine off
  • Check whether the transmission is cold. If not, give it some time to get cool.

Solution #01: Replacing the Broken or Loose Drive Belt

 Replacing the Broken or Loose Drive Belt

Husqvarna lawn mowers are designed with hydrostatic transmission having a drive belt that moves over the pulleys. The drive belt can be loosened and slip off the pulley, causing no movement of the Husqvarna zero turn.

Step 01: Closely check the drive belt. Is it cracked or loosened? Then be sure that the drive belt is slipping from the pulley. Generally, it happens when you use the lawn mower for a long-time without periodic maintenance.

Remember, no matter how often you change the drive belt, you will always experience slip-off issues if it is loosened.

Step 02: Therefore, change the damaged drive belt. Make sure it is perfectly tightened to avoid slip-off.

Step 03: At the same time, checking the belt guards is also important. If it is bent or damaged, replace it without fail.

Step 04: Is your Husqvarna still not moving after replacing and tensioning the drive belt?

The problem might be with the tensioner pulleys. Usually, the tensioner pulley is lubricated, most probably lacking lubrication. Regular lubrication is a must for the smooth operation of tensioner pulleys.

Step 05: If you find any signs of wear and tear in the tensioner pulleys, replace them.

Solution #02: Disengaging the Bypass Lever

Disengaging the Bypass Lever

Husqvarna is a type of hydrostatic transmission mower. It is engineered with a gear-based pump filled with fluids. The fluid moves and drives the wheels. While using the mower, this mechanism should be in operational mode.

An engaged or activated bypass lever is one of the prime causes of Husqvarna’s zero turn won’t go reverse. So, checking the bypass lever is crucial when such an issue occurs.

The below steps will let you disengage the bypass lever.

Step 01: In order to move your Husqvarna zero turn, engage the transmission and disengage the vital. Otherwise, your lawn mower will stick forever.

Step 02: Locate the bypass lever at the frame’s backside. Move the lawn mower by pulling the lever out and pushing it back before turning it on.

Step 03: Next, check whether the bypass lever is engaged. If yes, then disengage. Now, push or pull the mower.

Read Also: How to Fix Traction Loss On My Zero Turn Mower? (Checkpoints)

Solution #03: Replacing the Axle Key & Idler Spring

Replacing the Axle Key & Idler Spring

Many Husqvarna users ignore that the problem could be with the axle key and idler spring. Here is what you need to do to troubleshoot these two lawn mower parts when you experience no-reverse-no-forward

Axle Key Replacement

Did you change or replace the Husqvarna lawn mower’s tire recently? If yes, the axle may fall off because of its small size.

When the little key of the axle is missing, the wheel fails to move. Therefore, inspecting whether the axle key is missing and replacing it if necessary is better.

Spring of Idler Arm Replacement

Step 01: The responsibility of the idler arm spring is to maintain the tension on the belt. That is why the spring needs to be intact for riding mowers. In case the spring is broken, damaged, or missing, the belt will have negligible or zero tension.

Step 02: As mentioned above, the belt slips or doesn’t move. So, to keep the drive belt moving, having a functional spring of the idler arm is mandatory. If the idler arm is missing, replacing it with a new one is necessary.

Although the spring is a minor and small part, it plays a crucial responsibility. If the spring has a problem, the lawn mower wheel will stop moving.

Also, be careful when replacing or changing the tires not to fall off the small yet important component.

Read Also: What Does a Zero Turn Mower Mean? (Know Pros & Cons of It)

Solution #04: Eradicating Stuck Air from the Transmission

Eradicating Stuck Air from the Transmission

Stuck air in the transmission is another culprit of riding a mower that won’t go forward or reverse. Trapped air doesn’t let the hydro-pup build sufficient flow and drive the fuel. Therefore, the wheel stops moving.

To resolve the problem, eradicating stuck air from transmission becomes mandatory. Here are the steps to remove trapped air from the Husqvarna zero turn mower transmission.

Step 01: Park the Husqvarna zero turn on a flat surface. Then engage the wheel chocks to prevent unwanted rolling.

Step 02: Raise the rear wheel to enough height using a jack stand so that you can go underneath the mower.

Step 03: Next, open the bypass valve using the levers of the drive release. After that, disengage the parking brake and initiate the zero turn at full throttle.

Step 04: The levers need to be pushed forward. Then, reverse for roughly 6 times. Next, turn the engine off and initiate the brakes.

Step 05: The same process must be followed after closing the bypass valve.

Step 06: Then, turn the zero-turn engine on. Repeat step #04.

Step 07: Continue this until you notice the back-forth movement of the lawn mower wheel.

Step 08: By ensuring Step #07, all the trapped air will be removed from the transmission. Finally, the wheel of your Husqvarna zero turn will start moving.

Read Also: Best Zero Turn Mower For 5-10 Acres (7 Models To Try)


What would make a zero turn not move?

A zero-turn mower may experience movement issues if the transmission is disengaged, the drive belt is damaged, the hydrostatic transmission is stuck, the brake system is malfunctioning, or if there is insufficient maintenance and lubrication. Professional intervention may be necessary to diagnose and resolve the problem.

Why is my hydrostatic mower not moving?

If your hydrostatic mower is not moving, potential reasons could include a low fluid level in the hydraulic system, a clogged or damaged filter, a worn-out drive belt, a faulty pump or motor, or a problem with the control linkage. Professional diagnosis and repair may be required to resolve the issue effectively.

How do you check the hydraulic fluid on a Husqvarna zero turn mower?

To check the hydraulic fluid on a Husqvarna zero turn mower, follow these steps:
1. Park the mower on a level surface and turn off the engine.
2. Locate the hydraulic fluid reservoir, typically located near the rear of the mower.
3. Remove the cap from the reservoir.
4. Check the fluid level visually; it should be between the minimum and maximum markings on the dipstick or sight glass.
5. If the level is low, gradually add the recommended hydraulic fluid, avoiding overfilling.
6. Securely reattach the cap and ensure it is tightly sealed.
7. Start the mower and test its functionality.

What is Hydrolock on a zero turn mower?

Hydrolock on a zero-turn mower refers to a situation where water or another liquid enters the engine’s cylinders, preventing it from turning over. This can occur if the mower is excessively wet or water enters the engine through the air intake. Hydrolock can cause severe engine damage and typically requires professional repair.

Wrapping Up

Wanna avoid Husqvarna zero turn won’t go forward or reverse?

Maintaining periodic maintenance is the best option. You can easily discover a problem before it happens through manufacturer-recommended maintenance.

Seek professional assistance to diagnose and fix the issue effectively. It ensures your mower gets back to smoothly navigating your lawn in no time.

Similar Posts