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Lawn Tractor Transmission Types

Lawn Tractor Transmission Types Updated: January 2014

30 years ago gear drive transmissions were about the only transmission available for your tractor. They were built just like the transmissions in a Model A Ford or a 1953 Farmall tractor. Big, strong gears. Heavy axles and cast housings. They didn’t break but they were hard to use. You had to stop the tractor to change gears and most of the time you had to wiggle the tractor to move the shifter from one gear to another. The L&G purists pine for the “good old days” but I’m glad they are gone.

By Paul Sikkema. Find Paul on Google+

1977 Sears Attachments 150x134 Lawn Tractor Transmission Types There are now seven types of transmission found in today’s lawn tractors and zero turns.  They are gear, friction disk, automatic or CVT, hydrostatic, pump/motor, electric and hybrid.  I’ll spend a few paragraphs going through each type so you have a better idea of the best type for you. I am not going into the details of how each one works.  Just Google the transmission type and you can read to your heart’s content.

Gear

Ten years ago the gear drive transmission was the most popular but today hydrostatic and automatic transmissions have replaced them in popularity. Often called Manual transmissions this type uses a series of gears to change the ground speed of your tractor. These transmissions are not like the older styles though. They shift better, are much, much lighter and easier to use.  The biggest downfall of this type of transmission is you have to stop the tractor to shift to a different speed (range).  This makes them harder to use when you have a lot of garden beds and landscape features to go around.

httpv://www.youtube.com/watch?v=GGTVwOqaJ6Y

To drive the tractor you must push in on the clutch, shift the transmission to the gear you want to use, release the clutch, and hang on.  This is a dependable  transmission that will give you years of service.

Friction Disk

This is actually the transmission of choice for snow blowers but there are a few mowers like the Snapper Rear Engine Rider that use this trans.  It is a good, dependable transmission when used properly.  It uses a friction wheel and disk to change the forward speed of your rider.  Don’t use this transmission to pull heavy loads…you will tear up the friction wheel.

httpv://www.youtube.com/watch?v=VgHH_Tcufx4

You can shift-on-the-go with some models but to get the longest life most brands suggest you push down on the clutch/brake pedal and then shift to the speed you want.

Automatic or CVT

Element CVT 150x106 Lawn Tractor Transmission TypesJohn Deere originally used a CVT in conjunction with a manual transmission on the Model 110.  Now days, CVT’s have now matured to the point where you find them in cars, snowmobiles, snow blowers and even heavy-duty farm tractors. There are very few parts that wear in these transmissions and the recently introduced Element V from General Transmissions for your yard tractor is now stronger and requires less worry than all the hydrostatic transmissions. CVT’s for lawn tractors essentially a belt and variable pulley system similar to the drive system in a snowmobile or mini-bike.

I predict that CVT transmissions will replace most of the hydrostatic transmissions within the next 5 years.

MTD is using this on most of it’s least expensive lawn tractors. Using one is very much like driving your car. Put the lever on the fender in F and then press the right foot pedal. The farther you push the pedal the faster you go. To go in reverse put the fender lever in R and press on the right foot pedal. This trans is designed to mow lawns and is not designed to pull heavy loads.

The Element V from General Transmissions is another CVT that you will now find in Yard Tractors. This transmission is tougher, lighter weight and takes less power than the very popular Tuff Torq K46 and Hydro-Gear T2 hydrostatic transmissions. In fact the RS 800 Element V transmission is power rated very close to the most popular garden tractor transmission, the Hydro-Gear G730.  These transmissions are very easy to use. Either a fender mounted lever or foot control varies the speed and direction just like the hydro transmission you are used to. These transmissions do not need maintenance and I expect them to last the life of the mower.

To see how tough these new transmissions really are check out spot 1:27 in the next video!

There is one other form of CVT that has the possibility of also replacing the hydrostatic transmisson. Fallbrook has announced a commercial partnership with Hydro-Gear to bring NuVinci technology to the lawn & garden market. Instead of a variable pulley system uses a variable disk or ball/disk system.  This is the transmission of the future because it uses fewer moving parts than a gear trans, can pull heavier loads than an automatic and uses less oil than a hydrostatic. At this point in time though they are not yet cost effective for lawn tractor applications.  MTD tried using the dual IVT Infinitrak in the Cub Cadet and Craftsman Revolution but consumers were not ready to spend the extra money to own this type of transmission. New Holland is using these effectively in their 50 hp and larger tractors.

httpv://www.youtube.com/watch?v=h5bR0Z9EaEw

Hydrostatic

The most common transmission for lawn tractors today is a form of CVT called the hydrostatic transmission. There are two types of these transmissions used in Lawn & Garden equipment, pumps driving separate motors, and fully integrated (enclosed) units containing a pump, motor and gear reduction all in one aluminum housing.  Hydrostatic transmissions are more expensive than mechanical transmissions but they are much easier to use.

Hydrostatic - Enclosed Single

spin prod 922106912 150x150 Lawn Tractor Transmission Types Most lawn tractors, yard tractors, garden tractors and estate tractors in the last 15 years have an aluminum housing and inside that housing is the pump, motor, differential and drive axle. These transmissions are sized to the mower application so a lawn tractor trans is for mowing and a garden tractor transmission is heavier duty and can be used for many heavy duty tasks.  These transmissions are very easy to use.  Either a fender mounted lever or foot control varies the speed and direction.

The residential models you find on today’s lawn tractors are sealed units and are not serviceable by you or a mechanic.  maintenance, just a good cleaning once in a while of the outside case.  They are designed to give you years of service for normal use. The garden tractor and estate tractor hydrostatic transmissions are heavier and built to handle heavy loads and ground engaging attachments. Most of the hydrostatic transmissions in lawn tractors do not have posi-traction or differential lock.

These transmissions are very easy to use.  Either a fender mounted lever or foot control varies the speed and direction.  The pedal on the left side of the tractor is the parking brake.  You do not need to depress that pedal to shift the tractor.   The forward and reverse is controlled by either a lever on the right fender or two pedals on the right side floorboard.  To go forward push the fender lever forward or press on the large pedal on the floor board.  To stop the tractor pull the lever back to the middle position or lift your foot off the pedal.  To back the tractor up pull the fender lever to the rear or press the small pedal on the floorboard.

On the fender mounted control you HAVE to move the lever to the middle to stop your tractor.  It will not go to neutral by itself like the foot controls.

httpv://www.youtube.com/watch?v=KKQnet3IA_s

Hydrostatic - Enclosed Dual

Titan Hydro Gear ZT3100CO2282 ttn hydro gear 150x128 Lawn Tractor Transmission Types Two hydrostatic transmissions are mounted side-by-side in the residential zero turns.  Each trans controls a separate rear wheel.  That is the primary reason why zero-turn mowers cost more than the lawn tractors. Again these trans are designed for the application and most are not designed to pull loads, just mow and bag. If you want to pull a leaf vacumn or move dirt in your yard cart this is not the transmission for you.

httpv://www.youtube.com/watch?v=7-x_gCG9llo

Most of these transmissions are controlled by individual levers 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 these 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.  (The easiest way to explain how to drive a two-lever zero turn mower is to  use a shopping cart as an example.  With the mower turned off sit on the seat and put your hands on the two large levers in front of you.  Close you eyes and pretend you are gripping a shopping cart.   What do you do to move a shopping cart forward? Right, you push on the handle.   To back up? Right, you pull back on the handle.  To go left?  To go right?  Correct, you PUSH the handle in the direction you want to turn the cart.  Two lever zero turns work the same way.  Instead of one bar like a shopping  cart, the bar is split in two and you move each side to make it move.)

Hydrostatic - Pump & Motor

3000z feat 5 Lawn Tractor Transmission Types The more expensive commercial zero-turn mowers, stand-ons, and some golf course mowers use a separate variable displacement pump near the gas engine connected to the wheel motors with hydraulic hose or metal lines.  These are usually cast iron for long life and durability. A few of the high-end commercial mowers are now using enclosed cast iron hydros.

Electric

mean green 150x86 Lawn Tractor Transmission Types Electric drive systems are found in the mowers like the Hustler Zeon and consist of batteries, electronic controllers and electric motors.  The huge advantage of this design is it uses no belts, filters or fluids so they take less yearly maintenance. If you want green technology, no gas engine emissions and 30% less noise on your lawn this is an up and coming alternative to gas powered lawn mowers. You charge the mower using normal household current. They are currently limited by battery technology and battery price but that is changing fast.

HyBrid Electric/Gas

raven 7100s 300x146 Lawn Tractor Transmission Types The Raven 7100 uses a hybrid drive system.  A smaller gas engine (13 hp) charges batteries. These batteries then are used to power the lawn mower just like an all electric lawn mower. This technology is beneficial because it uses less fuel to mow your lawn and is quieter than using lawn tractors with larger engines.  The technology is sound and the actual implementation will be ready for the masses this year. This will be a great alternative to the gas powered lawn tractor.

All Electric

cxr62barcontrol 150x105 Lawn Tractor Transmission Types Electrics are coming and I feel in the next 5 years you will see affordable homeowner versions. These machines are not lawn tractors with electric motors replacing the gas engine but true state of the art electric vehicles. There are already commercial models that will mow all day long on a single charge.

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