John Deere Z994R Zero Turn Review - featured

John Deere Z994R Zero Turn Review

One of the latest John Deere products is the John Deere Z994R Zero Turn Mower. It is a comfortable mower to ride on while getting the job done in record time since it has a wide deck and tons of power with its diesel engine. This mower has been updated in 2021 with some great new features.

Most people are familiar with John Deere, but many may not know how they started. John Deere started out as a blacksmith who developed the first successful steel plow that was self-scouring and in 1837, he founded the company that still bears his name. In 1868, the business became incorporated under the name of Deere and Company. Today, the company touts itself as putting the customers of their products at the center of everything the company does. The company strives to incorporate high technology into its products that are easy for customers to use.

Check out our John Deere Z994R Review below.


The R series of John Deere Zero Turn mowers provide you with the ultimate level of functionality as well as productivity. It is the top level of all the series of John Deere's zero turn mowers, including M and E. The R series of mowers have more power and offer more comfort while you are using them, including the John Deere Z994R Zero Turn Mower.

Since it has a 24.7 horsepower diesel engine that is liquid-cooled and an 11.5-gallon fuel tank, this mower is great for large commercial jobs including sports fields, business complexes, and more. The mower is really in a league of its own when compared to the rest of John Deere's zero turns.

For a full comparison of diesel zero turn mowers check out our review here.

SpecsE SeriesM SeriesR Series
Deck48″, 54″, 60″ 48″, 54″, 60″, 72″ 54″, 60″, 72″
Engine Power25.0HP23.5HP, 25.5HP, 27HP, 31.0HP 24.7HP, 25.5HP, 27HP, 35.0HP
Displacement747 cc726 cc, 852 cc, 999 cc852 cc, 999 cc
FuelGasolineGasolineGasoline, Diesel
Warranty3 years3 years3 years

The Power Behind the John Deere Z994R Zero Turn Mower

John Deere Z994R Zero Turn Review - John Deere Z994R

The Engine

The Z994R packs plenty of punch and power through the use of its three-cylinder diesel-powered engine that boasts 24.7 horsepower. It has a rated power at 3200 rpm which meets the emission standards set forth by the U.S. Environmental Protection Agency (EPA) since it has a low-emission diesel engine that is designed for the best performance possible, even when used under less than desirable conditions. Its high-torque engine puts off low levels of noise which is also a huge plus, especially for the neighboring houses or businesses. It also gets great fuel economy which will save you money in the long run.

The liquid-cooled design of this diesel-powered motor allows for better-operating temperatures that stay more consistent than ones that are cooled by air. A good cooling system, along with a full-pressure lubrication system, allows for a longer life of the mower. The power of the John Deere Z994R Zero Turn Mower has been compared to the others in the line-up as the heaviest to haul but the most powerful and efficient.

The Transmission

When it comes to the drive system of the John Deere Z994R Zero Turn Mower, two 13-cc unitized hydraulic pumps keep this machine running at top speed. It has commercial-grade wheel motors that are located within a single unit. The design of having one pump with a motor drive for each wheel allows for much better cooling which makes it easier to check the hydraulic oil and refill it when necessary.

Features and Comfort of the Mower

close up of John Deere Z994R

The buyers of this mower can opt to use Michelin X Tweel Turf Airless Radial Tires since they will provide an even smoother ride for the person doing the mowing well actually improving the performance of the mower.

There are four different deck sizes that are great whether you are mowing, trimming, or grooming and one of them has a mulch on-demand option that is easy to use. You can also opt for a side discharge mower deck or a rear one which is great for keeping grass off driveways and sidewalks.

You can choose from three different seating options for this mower and each one includes the ComfortGlide suspension as well as adjustable armrests and an amazingly thick cushion, all of which will keep you comfortable throughout an entire day of mowing.


This mower was built to last and even comes with a three-year or 1,500-hour warranty. Wear and tear on the engine is reduced by the top-of-the-line lubrication system and the oil filter will keep the engine running clean for years to come.

Pros and Cons

Customers enjoy this mower because of the power at pax and how quickly it gets the job done. The footrests are not as comfortable as they could be, but the seating options are wonderful. It has a sleek and efficient design, but it is heavy to haul from one location to another.

Overall, this mower is like the granddaddy of the John Deere R Series. It is easy to operate, comfortable to ride on, and comes with plenty of options to fit a variety of needs and preferences.

Price of the John Deere Z994R

This mower has a starting price of $19,519. This is a competitive price when compared to other large diesel mowers similar to this one. Of course, it is much more expensive than comparable gas zero turns, but this is expected of diesel mowers.

Our Rating

Performance:4.5 out of 5 stars (4.5 / 5)
Cut Quality:4 out of 5 stars (4.0 / 5)
Durability:4.5 out of 5 stars (4.5 / 5)
Comfort:4 out of 5 stars (4.0 / 5)
Price:4 out of 5 stars (4.0 / 5)
Overall:4.2 out of 5 stars (4.2 / 5)

Video Review

Wrapping It Up

John Deere Z994R's features prove why it's one of the best. This is not only a longtime trusted brand but a high quality zero turn mower that will hang with some of the best in the industry. Of couse, if you know me, I'm not the biggest John Deere fan, but I definitely give credit where credit is due. This mower is a winner.

What Do You Think?

Are you planning to get the John Deere Z994R? What do you think of this mower? Let us know in the comments below!

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