Maya Ellison
Zero-turn mowers are popular for their ability to speed up mowing time and improve maneuverability. When considering a zero-turn mower, it is important to pay attention to the quality and size of the hydrostatic drive system, which is made up of wheel pumps that circulate hydraulic oil to power the mower's wheels. The larger the pumps and wheel motors, the more power and torque each wheel has. While some zero-turn mowers have sealed transmissions, others have serviceable transmissions that allow for oil changes. The transmissions in zero-turn mowers are often identified by numbers like 2800, 3100, or 3200, with larger numbers indicating more heavy-duty and powerful models. The type of transmission can impact the smoothness of the ride and the ease of use, with some models requiring practice to master. The engine is also a critical factor in choosing a zero-turn mower, ensuring it is powerful enough to support the deck width, machine weight, and desired speed.
| Characteristics | Values |
|---|---|
| Zero-turn mowers' transmissions | Made by Hydro-Gear, the leading manufacturer of hydro-drive components on zero-turns, especially residential models. |
| The bigger ones have more torque capability, which means more power and response to controls. | |
| The more expensive commercial zero-turn mowers use a separate variable displacement pump near the gas engine, connected to the wheel motors with hydraulic hose or metal lines. | |
| The Raven MPV-7100 uses a hybrid drive system. | |
| Two hydrostatic transmissions are mounted side-by-side in residential zero-turn mowers. | |
| Hydrostatic transmissions are made up of wheel pumps that circulate hydraulic oil to create energy that is converted to energy in wheel motors that drive the mower. | |
| The 7-speed manual transmissions are CVT Belt drive transmissions. | |
| Zero-turn mowers have sealed transmissions. |
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What You'll Learn
Zero-turn mowers use hydrostatic transmissions (HST)
Hydro-Gear is the leading manufacturer of hydro-drive components on zero-turns, especially on residential models. The 2800, 3100, etc. are all made by Hydro-Gear. These are what most manufacturers are using, but there are other brands. The 3100 and up are considered commercial grade. The bigger ones have more torque capability, which means there's more in reserve for loads and stress on them.
Hydrostatic transmissions are sealed units that degrade over time. They are filled with oil and use a pump powered by a belt to turn the gears with the built-up pressure. The pump is built into the transmission. Your engine spins the pump to create pressure, then the pedal redirects the fluid to spin the axle. The two easiest ways of destroying a hydro are by overheating it, either from running it too hard via towing or constant steep hills, or by pushing/pulling/towing your mower without the hydro-release pulled.
Most of these transmissions are controlled by individual levers called lap bars that sit in front of you. This type of transmission takes practice to keep the tires from digging into your lawn, but with a little practice, they are very easy to use. A large lever on each side of the seat controls that side transmission. To go forward, push on both levers. To stop, pull them back.
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The leading manufacturer of hydro-drive components is Hydro-Gear
Zero-turn mowers are known for their ability to rotate on the spot, and this is due to their hydrostatic transmissions. These transmissions are designed for the application and are not intended to pull loads. They are also more expensive than lawn tractors.
Hydro-Gear is the world's leading manufacturer of drivetrain solutions, including hydrostatic drives, transaxles, and fully electric drive systems. The company was founded in 1991 as a joint venture to create and manufacture transmission and axle combinations. Hydro-Gear supplies OEMs with transmission and axle combinations, pairing hydraulic transmissions with axle assemblies.
Hydro-Gear's transmissions are used in a range of machines, from heavy-duty industrial equipment to residential mowers. The company's products are known for their reliability, innovation, and quality. They are also praised for their customer focus and dedication to relationships. Hydro-Gear has been described as a "wonderful supplier" that is "innovative, efficient, and economical".
Hydro-Gear offers a range of electric drive systems, including lightweight yet durable and powerful options for the walk-behind market. The company also provides larger twin-axle transaxles, which offer smooth and quiet operation with a longer life and maintenance-free design.
In addition to its electric drive systems, Hydro-Gear manufactures hydrostatic transmissions, which are commonly used in zero-turn mowers. These transmissions are available in different grades, such as residential and commercial, with the latter being more heavy-duty and suitable for larger areas of land.
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Zero-turn mowers are more expensive than lawn tractors
The higher cost of zero-turn mowers is due in part to their more complex transmission systems. Two hydrostatic transmissions are mounted side-by-side in residential zero-turn mowers, and each controls a separate rear wheel. This type of transmission is designed specifically for mowing and bagging and is not suitable for pulling loads. In contrast, lawn tractors can be used to pull carts, sprayers, spreaders, and other yard equipment.
Zero-turn mowers also tend to have larger decks than lawn tractors, which can reduce the time needed to mow a lawn. Lawn tractors have decks ranging from 42 to 54 inches, while zero-turn mowers have decks from 42 to over 60 inches. The wider deck of a zero-turn mower can be advantageous for large, flat lawns, as it reduces the number of swaths required to cover the lawn. However, for lawns with tight spaces, such as between trees or flower beds, a narrower deck may be necessary.
In addition to their higher cost and more specialized transmission, zero-turn mowers also have a steeper learning curve than lawn tractors. Zero-turn mowers are controlled with a pair of lap bars, one for each drive wheel, which can take some practice to master. The differential speed control offered by the dual-hydrostatic transmission can be touchy, leading to lurching and sudden stops until the user becomes accustomed to the speed control.
Despite their higher cost and complexity, zero-turn mowers offer some advantages over lawn tractors. Zero-turn mowers are known for their speed and maneuverability, making them suitable for large, flat lawns. They can provide professional-quality cuts and reduce the time needed to mow a lawn. However, it is important to consider the specific characteristics of your lawn, such as slopes, ditches, hills, and obstacles, as zero-turn mowers may not be suitable for all terrain types.
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The engine is the most important feature of a zero-turn mower
Zero-turn mowers are known for their easy manoeuvrability and precision, allowing you to cut grass efficiently around obstacles, tight corners and landscaping features. They are also faster than traditional mowers. The engine is the most important feature of a zero-turn mower. It is the heart of the machine, supplying power to turn the tires, rotate blades and cut grass.
Zero-turn engines can have one, two or three cylinders, with two or three-cylinder configurations recommended for rough terrain and cutting grass on large properties. The horsepower and engine size impact the speed and cutting efficiency of the mower. Advances in engine design give buyers a choice of gasoline, diesel or liquified petroleum gas (LP) engines. LP and gas-powered engines produce more carbon monoxide emissions than diesel engines, so fuel economy and emissions are also factors to consider.
The type of engine will also determine the type of transmission. Transmissions are built by different companies and are available in different grades. The bigger the transmission, the more torque capability it has, which means more power and response. A bigger transmission also means faster driving speeds. Most zero-turn mowers today have two hydrostatic transmissions mounted side-by-side, with each transmission controlling a separate rear wheel. These are designed for mowing and bagging, not for pulling loads.
The transmission type will also determine the steering mechanism. Steering a zero-turn mower is simply a matter of changing the speed of the drive tires, a method called differential steering. The tire speed is controlled by two levers that protrude on either side of the driver, usually extending over the lap (lap bars).
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Zero-turn mowers are available in a wide range of sizes
Residential-grade zero-turn mowers typically have smaller engines, ranging from 15 to 21 horsepower, which are suitable for well-maintained yards. These mowers usually have cutting decks ranging from 42 to 52 inches in width, which is sufficient for cutting grass in a residential setting. While a larger deck size can lead to increased efficiency, it also contributes to a higher price tag and may not be necessary for smaller lawns.
On the other hand, commercial-duty zero-turn mowers are designed for larger, flat lawns and are equipped with more powerful engines, such as the 26-hp engine found in entry-level commercial models. These mowers often have cutting decks of 60 inches or wider, enabling them to cover more ground with each pass. The bigger size of these mowers also translates to increased torque capability and faster driving speeds, making them ideal for time-efficient mowing of expansive areas.
The size of the zero-turn mower's transmission is another factor to consider. Transmissions with higher numbers, such as 3100 and above, are considered commercial grade and are more heavy-duty. These larger transmissions provide more torque capability and improved power and response. However, it is worth noting that increasing the engine and transmission size also leads to increased fuel consumption, noise, and cost.
When choosing a zero-turn mower, it is essential to strike a balance between the size of the machine and your specific needs. While a larger mower can expedite the mowing process, it may also present challenges in terms of storage and manoeuvring in tight spaces. Therefore, it is advisable to carefully assess the size of your lawn, the terrain, and your budget before selecting a zero-turn mower that aligns with your requirements.
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Frequently asked questions
Zero-turn mowers use hydrostatic transmissions (HST) to drive the mower. The transmission is made up of wheel pumps that circulate hydraulic oil to create energy that is converted to energy in the wheel motors that ultimately drive the mower.
The purpose of the hydrostatic transmission is to provide power and torque to each wheel, allowing for better maneuverability and smoother acceleration.
Yes, there are different types of hydrostatic transmissions available. Some are designed for residential use, while others are commercial-grade. The more expensive commercial zero-turn mowers often feature separate variable displacement pumps and cast iron components for durability.
The type of mower you need depends on the size and nature of your lawn. If you have a large area to mow or challenging terrain, a commercial-grade mower with a more powerful transmission may be necessary. Residential mowers are suitable for smaller, level lawns.
Maintaining the hydrostatic transmission involves keeping the cooling fins clean and ensuring the cooling fans are in good working condition. Some zero-turn mowers have "sealed" transmissions that do not require traditional fluid changes, but you may need to consult a dealer for specific maintenance requirements.
