John Deere Z445 Problems

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The John Deere Z445 zero turn mower runs on a 24 hp V-twin engine for efficient handling of large mowing projects. It has a forward speed of 8.5 mph and a reverse speed of 4 mph to enable you to cut in a shorter time.

Although it has fast maneuverability, enough torque, and a comfortable seat, it is not without downsides. In this article, we will outline eight common problems with the John Deere Z445 zero turn mower and its possible fixes to guide you.

8 Common John Deere Z445 Problems


Here are some common problems with John Deere Z445 zero turn mower:

1. Vacuum Problem of the Engine

Some users reported that they had an issue with the release of exhaust from the mower’s engine. 

The air couldn’t escape from the mower because the gas cap vent is plugged in the zero-turn mower and this hinders the functionality of the engine.

Fix: The easiest way to fix this problem is to replace the gas cap.

2. Transmission Problem

The transmission system of your mower converts the electrical power to mechanical power through the hydraulic pumps. 

Many customers complained about their hydraulic transmission. This problem arises as a result of the leaks and breaks of the fittings.

Fix: If you make use of the John Deere Z445 model for a long time, always check the connections of your transmission system or the mower’s oil level.

In some cases, whereby your machine has been idle for a long time, air can form inside the pipes. You need to purge the mowing machine to get rid of the air.

3. The Dilemma of Safety Features

Since the Z445 model has a complicated engine, there are safety features that are put in place to prevent mishaps. 

Sometimes, these measures can stop your engine without any tangible reason when you are halfway while mowing. There are different situations to this:

Situation One– Your machine may stop for safety purposes if the deck is in operation and your mowing machine is in reverse gear.

Situation Two– If your cutting deck gets clogged by an object, it might hamper the smooth running of the mower blades, making the engine stop.

Fix: Inspect the mower deck and remove any object that clogs it.

Situation Three– Sometimes, your John Deere Z445 could be sending a false signal that the rider is not on the seat or it is moving in reverse. This could happen when the electrical system is malfunctioning.

Fix: You need to contact a professional to help check the electrical system and fix this issue.

4. Firing Problem

Some users complained that the mower didn’t fire as it should have. This could be linked to the coil or wire. The crystallization of the wire could also be the major reason for this issue.

Fix: Cut the wire to the point that it seems okay for you and slice another end on it. It will work like the new ones.

5. Steering Problem


A few users cited motion control problems as one of the challenges of their mower. In some cases, the left arm becomes stiffer than the right arm which results in issues with the left motion control.

Fix: To correct the motion and speed of your mower, you need to check the bolts at the control’s arm base.

6. The Muffler Issue

Another issue pointed out by users is the mower’s muffler. 

The muffler is quite close to the ground. If you stand for a longer period, the mower’s muffler will burn the grass.

Fix: Since it’s a manufacturing issue,  John Deere needs to improve on its design.

7. Problems When Mowing on Rough Ground with Ditches


The John Deere Z445 operates very fast while mowing on a level surface but in some cases where there are many trees or objects, it won’t perform efficiently.

Fix: Since the machine moves very fast and can easily catch up with trimmings. 

You need to be very careful about its handling to ensure efficiency. You also need to clean the blades regularly.

8. Brake Problem

Several people have complained that the levers get jammed or they cannot park the mower even after pulling the levers. The levers can get jammed as a result of rust, soot, or deposition of oil.

Fix: To prevent your levers from getting jammed, ensure that you use lubricant oil. In terms of consistency, make sure that the lubricant oil is neither too thin nor thick. 

If you discover rust or an accumulation of dirt near the lever, use a brush and cloth to clean it.

Lastly, if the mower isn’t parking even after pressing the levers, it means that the brake system is malfunctioning. In this case, it is advisable to call an expert.


The John Deere Z445 comes with innovative features such as a powerful V-twin air-cooled engine, a medium-back seat, and a 48 or 54-inch mower deck to suit your mowing needs. But like every other mower, it is not without drawbacks.

We hope that our troubleshooting tips will help guide you to solve the problems. If you do not have the time, tools, and experience to fix it, it is advisable to seek the help of a professional.

Frequently Asked Questions

What engine is in a John Deere Z445?

The zero-turn mower runs on a 24 hp (17.9kW) V-twin engine with 44.3 cu in. (726-cc) displacement for a powerful mowing operation.

How much oil does a John Deere Z445 take?

It has an oil capacity of 1.6 qts (1.5 L).

What size deck is on a John Deere Z445?

The zero-turn mower comes with a 48 or 54-inch mower deck.