Transmission, Infinitely Variable (IVT™) for 8030 Series Wheel Tractors
IVT cutaway

IVT cutaway

The revolutionary Infinitely Variable Transmission (IVT) provides excellent performance in all farming conditions. The John Deere IVT is an easy transmission to use, with simple and intuitive controls allowing you to move smoothly from 0.03 mph (50 meters/hr.) to 26 mph (42 km/hr.) and any speed in between. Never again is a gear too fast or too slow; the IVT provides a seamless range of speeds with no gaps. No clutching is required to start or stop the tractor. The footbrake with integrated AutoClutch performs like the brake in a car; simply depress both brakes and the transmission ratios down to a stop from any ground speed.  To keep your 8030 Series tractor stationary even on inclines, use the John Deere-exclusive PowerZero™ feature.  The 8030 Series IVT offers a choice of two control strategies: a right-hand reverser control (order code 1127) and a left-hand reverser control (order code 1137).  The right-hand reverser control is optional on the 8130-8430 Wheel Tractors and base equipment on the 275 PTO hp 8530 Tractor.  The left-hand reverser control is optional on all 8030 Series wheel tractors.  The IVT is not available on the 8130 two-wheel-drive tractors or 8030 Series track tractors.
 
The space-saving countershaft design allows the IVT to fit into the same space as the 16-speed PowerShift transmission  with internal parts sized appropriately for the power of the 8030 Series tractors.  For efficient and smooth operation, power is transmitted through the transmission to the final drive with a minimum of gear/clutch engagements.  The John Deere IVT uses a hydromechanical, power-splitting design where a portion of the power is transmitted mechanically and a portion hydrostatically. A hydromechanical transmission is more efficient than a purely hydrostatic transmission because gears carry power more efficiently than a hydraulic pump and motor. By careful selection of the gearing, the John Deere IVT carries a maximum of the power mechanically both at normal field working speeds and at transport speeds, taking maximum advantage of the higher mechanical efficiency while providing the control and versatility of  a hydrostatic. The versatility of speed variability and mechanical performance coupled with electronic control makes the John Deere IVT a very economical transmission for a variety of applications.
 
The IVT has a fully integrated Electronic Management System that allows the engine to communicate 100 times a second with the transmission.  This technology allows unrivalled ease of operation among all transmissions, making it ideal for agricultural businesses with flexible labor schemes.  This high-efficiency design combined with an exclusive control system brings tomorrow's technology home today.  Electronic communication and interaction between the engine and the transmission allow optimum productivity and efficiency at any engine speed.  This is achieved because the operating conditions are being constantly monitored and relayed to the Electronic Management System, which then automatically determines whether the tractor is in a loaded condition or a light- to no-load condition and makes the appropriate adjustments.
 
The Electronic Management System works with the IVT and engine to maintain the selected travel speed at reduced engine rpm when the IVT selector activates the system, resulting in increased efficiency and reduced fuel consumption.
IVT selector
 
The IVT selector has four positive detent positions:

       Position 0, "Off"
       Position 1, "Automatic Mode"
       Position 2, "Automatic Mode"
       Position 3, "Automatic Mode"

IVT selector switch

IVT selector switch

"Off" Position - Used for special applications:
When turned off, the Electronic Management System is disabled and the transmission operates as any traditional transmission where the operator sets the engine speed and ground speed.   The transmission will not automatically shift with varying engine load to maintain your selected ground speed.  For most applications, positions 1, 2, or 3 should be selected to provide maximum productivity and minimize fuel consumption.

 

Position 1 - Primarily for PTO applications:
Use position 1 when operating PTO-powered implements.  In positions 1, 2, or 3, the tractor tries to maintain the selected travel speed at reduced engine rpm for reduced fuel consumption and increased efficiency.  In position 1 and the PTO engaged, the engine rpm can only be reduced minimally in order to maintain proper PTO operating speed of 540 or 1000 rpm.  When a load is placed on the tractor, the engine will first increase power to maintain PTO rpm.  Once maximum engine power is reached and additional load is placed on the tractor, the IVT transmission will reduce speed enough to keep the motor at maximum power until the tough condition is over, then the transmission will increase the speed back up to the speed selected.  Once the load is reduced further, engine rpm will again drop to reduce fuel consumption.  All of this is done automatically through the Electronic Management System, maintaining communication between the engine and transmission.

 

Position 2 - For heavy draft and tillage applications or when hydraulic flow is needed:
Use position 2 when operating heavy tillage equipment.  As in position 1, the tractor will try to maintain the selected ground speed at reduced engine rpm for improved efficiency and reduced fuel consumption.  The minimum engine rpm is adjustable in the CommandCenter™ to customize the tractor to the application.  Since the PTO is no longer involved, the rpm is allowed to go lower than in position 1.  As before, when  the load increases on the tractor, the engine increases power until maximum power is reached; then, if needed, the IVT transmission will ratio down (slow the tractor) enough to keep engine power at maximum.  Once the tractor is through this tough spot, the IVT will ratio up (increase speed) back to the selected speed and the engine will reduce rpm.  All of these operations are performed automatically by the Electronic Management System.


Position 3 - For transport and light tillage applications:
Use position 3 for light tillage or transport applications.  In this position, the engine rpm will reduce lower than in positions 1 or 2 to save additional fuel.  The tractor is capable of full transport speed of 26 mph (42 km/hr.) at very low engine rpm's (as low as 1200).  As before, the minimum engine rpm is adjustable in the CommandCenter to allow the operator to customize the tractor to the applications.


In the end, the Electronic Management System operates similarly to the traditional "gear up and throttle back" operation performed manually.  However, because the Electronic Management System is continually communicating with the engine and transmission and making appropriate adjustments based on inputs received from the tractor, it responds quickly and precisely to changing conditions.  This allows maximum efficiency and productivity from the tractor.  Because these changes are done automatically, it reduces the reliance on operator experience to make the appropriate manual adjustments.  Even the most experienced operator will see enhancements to tractor productivity while minimizing fuel consumption in all applications.

Order code 1127: right-hand reverser control
 
Right-hand reverser control

Right-hand reverser control

With the right-hand reverser, there are three main controls used to operate the transmission:

     1. Foot brake with integrated AutoClutch feature
     2. Set speed adjuster
     3. Multi-function speed control lever

 
The right-hand reverser control strategy combines the speed control lever with the multi-function controls in a single lever conveniently located on the CommandARMTM as shown to the left.  This would be a good choice for most common field applications since tractor speed and direction are not constantly being adjusted by the operator.
Order code 1137: left-hand reverser control
 
Left-hand speed control lever

Left-hand speed control lever

Left-hand multi-function lever

Left-hand multi-function lever

With the left-hand reverser, there are four main controls used to operate the transmission:
     1. Foot brake with integrated AutoClutch feature
     2. Set speed adjuster
     3. Speed control lever with two variable speed bands
     4. Multi-function left-hand reverser

The left-hand reverser control strategy separates the speed control lever from the multi-function controls as shown above.   This strategy would be a good choice for operations requiring the right-hand to run multiple operations on the CommandARM or applications requiring constant directional changes.  A good example would be loader work where typically the right hand is busy operating a joystick so the left hand can now control tractor direction and PowerZeroTM.
Foot brake with integrated AutoClutch function
 
Foot brake with integrated AutoClutch

Foot brake with integrated AutoClutch

The electrohydraulically controlled brakes on IVT-equipped tractors have an integrated AutoClutch function.  At low idle only, the tractor will stop by depressing only one brake pedal.  Pressing both brakes simultaneously will stop the tractor from any ground or increased engine speed.  This can be done on flat ground or steep slopes simply by using the brake pedals; it is not necessary to depress the clutch.  It is recommended to lock the brake pedals together when operating on roads.
 
Note: The preferred method of stopping heavy towed loads is to slow the IVT speed lever and lower engine rpm first, and then depress both brake pedals.
Foot throttle
 
Foot throttle

Foot throttle

Using the optional foot throttle in conjunction with the footbrake with integrated AutoClutch is the preferred method of operating an IVT-equipped tractor on the road.  It is as close to driving a car as you can get in a tractor.  Using the foot throttle to make minor adjustments to tractor speed simplifies operation of the tractor.  When coming to a stop, let off the foot throttle, reducing both engine rpm and speed, then depress both brake pedals.  To resume movement, simply release the brakes and depress the foot throttle.  It doesn't get much easier than that!  
Set speed adjuster
 
Set speed adjusting wheel

Set speed adjusting wheel

The set speed adjusting wheel is a rotational wheel located on the speed control lever. The wheel is quickly and easily adjusted with the thumb and rotates infinitely with no stop or start position to allow quick adjustment of the maximum set speeds.  The set speed adjuster is used to control the maximum commanded forward or reverse speed in each speed band (speed bands are discussed in more detail below but could include F1, F2 in forward, and R1, R2 in reverse depending on style of reverser control).


While in motion, the speed lever must be in the speed band for which you wish to set the maximum set speed. When stationary, all set speeds, both forward and reverse, may be adjusted while the speed control lever is in the scroll position (scroll position shown at left); however, there is a difference between the two control strategies.  On tractors equipped with right-hand reverser controls, the engine must be running, while on tractors with left-hand reverser controls, the engine does not have to be running; you only need the key switch on.  The maximum speed selected in forward and reverse is shown on the cornerpost display.  Forward set speed 1 can be adjusted to a maximum of 12.5 mph, while set speed 2 can reach 25 mph.  Also, set speed 2 must always be at least 10 percent faster than set speed 1.  For reverse, on tractors equipped with right-hand reverser controls, there is only one reverse slot and the maximum speed is 12.5 mph.  On tractors equipped with left-hand reverser controls, the operator has a choice of two set speeds with set speed 1 having a maximum speed of 6 mph and set speed 2 adjustable to 12.5 mph maximum.

Multi-function and speed control lever
 
Right-hand reverser

Right-hand reverser

Left-hand reverser

Left-hand reverser

Left-hand reverser

Left-hand reverser

On a right-hand reverser, the multi-function and speed control lever are combined into one lever.  On a left-hand reverser, they are separate levers.
 
The speed control lever controls the commanded speed of the tractor.  Forward and reverse speeds can be programmed into the tractor using the set speed adjuster either prior to moving or while operating the tractor.  These programmed or set speeds are achieved when the speed control lever is placed at the end of either speed band F1, F2, or R on right-hand reverser controls or 1 or 2 on left-hand reverser controls.  Ground speed is variable from a very slow (creeper) speed of 0.03 mph (50 meters/hr.) at the bottom end of the first forward band up to the preset set speed 1 at the top end of the first speed band (position F1 or 1 shown above). The commanded speed is then variable from set speed 1 to set speed 2 at the top end of the second variable speed band (position F2 or 2 shown above).  Speed band 2 always begins where speed band 1 ended.  There is never a gap or overlap so speed progression is continuous as the speed control lever passes through the transition, although the rate of speed change may be different for each speed band.  As the operator moves the lever within or between speed bands, the Electronic Management System ensures smooth, quick, and powerful acceleration or deceleration, regardless of load or ground speed.  Commanded speed (determined by the position of the speed lever) and ground speed (calculated from tire size and axle rotational speed or radar speed if equipped with radar) are displayed on the cornerpost display.
 
The multi-function portion controls directional, neutral, park, PowerZero and scroll.  Refer to the above picture for location of these positions.
  • Park (marked P) - Engages the electrohydraulic park brake.  Lever must be in this position to start the tractor. 
  • Neutral (marked N) - Allows the tractor to roll freely.
  • Scroll - Tractor will be in PowerZero while in the scroll position.  Use scroll position to adjust forward and reverse set speeds while stationary.  The tractor will default to Park immediately if the operator leaves the seat.           
  • PowerZero - In PowerZero, the transmission is operating but delivering zero speed, so the tractor will hold its position regardless of load or incline without using the brakes.  This is ideal for loader work or operations where the tractor needs to be totally stationary for a short period of time.  Lever must be held in this position or it will automatically go to the scroll position.  As long as the lever is held in the PowerZero position, the tractor will not default to park as it does in the scroll position. 
  • Forward and Reverse Directional Control - On right-hand reverser controls, moving the lever to any position within F1, F2, or R slots determines tractor direction.  On left-hand reverser controls, the left-hand reverser lever must be moved to either the forward or reverse slot for tractor movement and direction, independently of the speed control lever position.  On either right-hand or left-hand reverser controls, the lever can be moved between forward and reverse without stopping to allow smooth, quick direction changes.
IVT vs. PST productivity and efficiency
 
After discussing the details of the IVT, the question will remain which transmission, IVT or PST, would be better suited to a particular operation or application.  Some applications requiring creeper speeds (such as harvesting sugar beets or potatoes), precise speed control (spraying) or speed matching (grain cart or dump wagon alongside a harvester), and other specialized or specific applications are ideally suited to the IVT.  However, many common tillage applications are not as clearly defined.  To assist with this decision-making process, a chart has been developed comparing a PowerShift using Automatic PowerShift (APS) to an IVT using Automatic Mode (IVT selector set in position 1, 2, or 3).  When looking at the ranges given in the chart, the lower range of the percentages given should be used if the operator uses APS with their current PST in the operation or application.  If the operator does not currently use APS, then use the upper range of the percentages shown for comparison purposes. 
 


8030 Series vs. 8020 Series Fuel Efficiency Benefit Summary

Average Load
(Example Application)

8020 Series PST
vs.
8030 Series PST

8030 Series PST
vs.
8030 Series IVT

8020 Series PST
vs.
8030 Series IVT

15-35% (Light Transport)

2-5%

5-10%

5-15%

65-75% (Heavy Cultivation)

2-5%

3-5%

5-7%

80-90% (Ripping)

2-5%

0-3%

3-4%

NOTE: All numbers shown above are best approximations based on John Deere factory observed and calculated data for Powershift tractors using APS vs. 8030 Series IVT in Automatic Mode.
 
Note: When operating the IVT in cold climates, be aware that tractor operation will be affected until the transmission oil begins to warm up.  Engine speed will be limited to 1500 rpm if the transmission oil temperature is less than 23 degrees F (-5 C) and wheel speed will be limited to 3 mph (5 km/h) when the oil temperature is less than 5 degrees F (15 C).   
Base Equipment On : 8530
Optional Equipment On : 8130, 8230, 8330, 8430
 
Last Updated : 18-Oct-2010