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 | eHydro transmission decal |
The tractor is available with a three-range electronic hydrostatic (eHydro) transmission.
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- Fluid under pressure transmits engine power to the drive wheels using a pump and motor
- Functions both as a clutch and transmission
- Provides high torque for startup
- Reduces powertrain shock loads
Sauer-Danfoss® supplies both the pump and motor. This assures that the components are matched to each other, providing maximum efficiency.
The electronic hydrostatic transmission is ideally suited for jobs where productivity is a must, such as loader or mower applications.
Twin Touch™ foot controls allow the operator to select both direction of travel and speed with a
touch of the toe.
Key features of the eHydro transmission are:
- Infinite ground speeds, even at full throttle, allow the operator to match the speed of the tractor to the job.
- No clutching for fast and easy direction changes
- Twin Touch foot pedals for quick and easy forward/reverse operation
- Cruise control is base equipment
- Cruise control switch is located on the right-hand console for easy access
- Cruise control is electronically engaged and disengaged, which allows for precise setting of speed
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 | Sauer-Danfoss eHydro transmission |
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Sauer-Danfoss eHydro transmission is used for reliable operation. Durability features include:
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Large forged trunnion shaft with larger support bearings that reduce vibration and noise.
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Center section made from ductile iron (much stronger than grey iron used in many competitive transmissions).
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Pressure side filtration allows using a finer mesh filter (10 micron) than suction filtration systems used on many competitive tractors.
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Transmission oil cooler cools transmission oil for longer transmission life.
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| Key John Deere advantage |
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 | Twin Touch foot controls |
John Deere's Twin Touch foot controls offer several key advantages over competitive hydro model tractors. | | |
Key advantages over competitive hydro model tractors:
- Some competitive hydrostatic tractors use a treadle pedal (toe-heel) design foot control for operation of the hydro
- Requires the operator to use both toe and heel to change direction, resulting in increased operator fatigue
- Some competitive hydrostatic tractors have their individual turning brakes on the same side as their treadle pedal
- This configuration makes it virtually impossible to operate both the turning brakes and hydro pedal at the same time on these competitive models
- This configuration also makes it difficult to ''inch'' the tractor forward or rearward (for example, when attaching to implements)
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| Standard cruise control |
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 | Cruise control switch |
A ''true-speed'' cruise control is base equipment on 4120-4720 Tractors with eHydro transmission. Cruise control is electronically engaged and disengaged and is located on the operator console to the right of the operator.
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- Maintains desired forward speed without pressure on the foot pedal
- Cruise control is set by engaging the switch when the desired speed is reached
- A speed sensor also allows the tractor to maintain preset speed driving up and down hills
- To disengage the cruise control, either:
- Apply pressure to the turn brakes opposite the eHydro pedals, or
- Disengage cruise control switch, or
- Briefly depress the reverse control pedal
Safety features of the eHydro transmission include:
- The tractor will start with one or both foot pedals depressed, but it will not move until both pedals first return to neutral
- The tractor will come to a stop if the operator leaves the seat but will not shut off unless the PTO is also running
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| LoadMatch™ Power Management System |
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 | LoadMatch switch |
LoadMatch is an industry exclusive and a standard feature of the eHydro transmission.
If torque requirements increase significantly, the transmission will reduce the tractor's drive speed to compensate for the increased load on the transmission, maximizing torque to drive wheels and minimizing stalls.
While typically left on, LoadMatch can be turned off with the instrument panel controls. If an operator has a need to turn LoadMatch off and on quickly, an on-board switch can be installed, as illustrated in picture. The switch (LVA11189) is orderable through Service Parts. (The switch was previously standard on the 3000 and 4000 TWENTY Series Tractors. Because of a running change, there will be a mix of tractors in the market with and without the standard switch through 2009.)
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| Standard MotionMatch™ |
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 | MotionMatch |
The enhanced MotionMatch has been integrated into the instrument panel and offers nine settings for adjusting the rollout or decelerate when the pedal is released.
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| eThrottle™ |
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The eThrottle feature is designed make the tractor quieter and use less fuel. With the simple push of a button, the engine speed will be linked to the pedal position. The operator can keep the throttle essentially all the way in the low position. The engine rpms as well as the tractor speed will increase together with the pedal position.
NOTE: Available on the 4520 and 4720 Tractors only. The eThrottle is in base equipment on all HST 4520 and 4720 Tractors.
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| Economy PTO |
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This fuel-saving option for 4520 and 4720 tractors is factory-installed only and is listed in the configurator under transmission options. Please refer to the economy PTO sales manual page for further details.
Sauer-Danfoss is a U.S.-registered trademark of Sauer-Danfoss, Inc.
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| Last Updated : 25-Jul-2013 |
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