The fast unloading system of the T670 provides a rate of 125 L/sec (3.3 bu/sec). Compared to the previous unloading system, this ensures an unloading rate that is 50 percent faster and is reflected as a time saving when unloading on the headland.

The higher unload rate is achieved by grain tank cross augers, an increased discharge housing including vertical auger, and an overall higher speed of the unloading system.

To improve serviceability and cleaning of the entire combine after a long and dusty working day, a factory-installed air compressor is available as an option.

The air compressor features three air take-off couplers: one on the left side near the toolbox compartment, one on the right side below the fuel tank, and one on the engine deck. With a 10-m (32.8-ft) hose, an additional air pistol, and a 125-cm (49.2-in.) lance, each point on the machine can be reached comfortably, easily, and quickly.

The air connection valve is activated with the air compressor engagement button on the armrest. Air can be used via the quick couplers. The air compressor engagement button can be activated when the machine is not moving, separator disengaged, and park brake activated.

Once the air compressor is engaged by a button on the armrest, the system starts to fill the 60-L (16-gal.) air reservoir tank until a shut-off pressure of eight bars (116 psi) is reached. The system automatically stops to ensure power is only consumed if necessary.

NOTE: The air compressor option has not been optimized for operation of air tools and is not recommended to blow out engine air filter or debris management filter with the engine in operation.

NOTE: It is recommended to drain moisture from the air tank daily when the machine is in use to prevent degradation in the performance of the system. When servicing the air compressor, it is recommended to expel all stored air from the system.

Extra-fine-cut chopper rotor and housing

The improved extra-fine-cut straw chopper delivers excellent chopping quality and best-in-class residue distribution of chopped material in the field with a cutting width up to 10.70 m (35 ft).

The extra-fine-cut chopper comes standard with serrated chopper knives, which ensure superior splicing of the straw and improved straw rotting process. The extra-fine-cut chopper is highly recommended for producers with no tillage or minimum tillage operations.

The optional dual-speed chopper drive provides flexibility to match all crops and conditions.

Armrest adjustment

The extra-fine-cut chopper comes standard with a remote adjustable tailboard.

The remote adjustable tailboard can be adjusted from the cab conveniently via armrest control buttons (button A). The in-cab adjustment includes a unique tailboard position swap button (button B) – by pressing the button on the armrest, the tailboard vanes automatically swap from left to right stored position and vice versa.

False floor geometry housing

The extra-fine-cut chopper housing follows the contour of the rotating knifes. This false floor geometry narrows the gap between the rotating knife and the chopper housing to a 4–5 mm (0.16-0.20-in.) closing at a wrapping angle of 83 degrees. It requires no adjustments and does not require any maintenance or replacements.

Wind paddle

The T670 with extra-fine-cut chopper comes standard equipped with wind paddles, which are factory installed on two knife rows. The wind paddles are mounted with bushings to withstand impacts from foreign objects. Equipped with wind paddles, the extra-fine-cut chopper is able to spread the chopped straw evenly up to 10.70 m (35 ft). Wind paddles are more effective than active radial spreaders which are normally hydraulically driven.

Counter knives

Counter knives adjustment

The extra-fine-cut chopper comes standard with a counterknife row, which is infinitely adjustable with two large leavers on each side. To secure the position, only one bolt needs to be tightened at each side.

Windrow sheet

Windrow deflector plate

Straw chopper clutch

A single lever operates the windrow deflector plate. Operated on the right side, the straw is guided into the chopper or down on the ground for windrowing.

The straw chopper is directly driven from the main engine gearcase and automatically engages with the separator drive. A heavy-duty power belt reliably transmits drive power to the chopper. A reliable clutch is used for engaging and disengaging the chopper rotor.

Grouser bar

Grouser bar adjustment

The extra-fine-cut chopper features a redesigned grouser bar, which is infinitely adjustable with a slide bar. To reduce the length of chopped material in green straw conditions, the grouser bar should be engaged. In dry straw conditions, it improves the splicing of the straw. To decrease fuel consumption, it is recommended to remove the grouser bar when chopping other crops such as corn, rape seed, beans, peas, and sunflower. 

Tailboard angle adjustment

Tailboard angle adjustment

Tailboard vane adjustment

The tailboard angle can be adjusted without tools in three positions with a lever on each side.

In addition to the three-point tailboard adjustment, the vane angle can be set in four additional positions to ensure the spreading width of the residue matches all cutting platforms up to 10.70 m (35 ft).

The extra-fine-cut chopper comes standard with a 10-vane electrical tailboard design.

Remote adjustment of DynaFlo Plus cleaning system

The Dyna-Flo Plus cleaning system comes standard with electric adjustment on all T670 Combines.

The remote cleaning shoe adjustment can be either completed from inside the cab on display settings or with the armrest buttons. As an alternative solution, such as when inspecting the shoe from the outside, settings can also be adjusted from the left side at the rear of the machine.

The remote cleaning shoe adjustment motors are equipped with an integrated position sensor. This eliminates the need of recalibration of the electric motors. Calibrations only need to be redone in case the electric hardware or the cleaning shoe elements get replaced.

Quick-engage booster bar

Quick-engage booster bar adjustment

The quick-engage booster bar is adjustable from the outside via the stone trap with a 24-mm (0.95-in.) wrench. It has two positions. In the engaged position, the concave entrance features a profiled raps bar. In the disengaged position, the concave entrance features a smooth transition plate. Adjustment can be completed easily within minutes.

Material flow coming from the feederhouse passing the booster bar is slowed down; this increases the threshing efficiency. The booster bar does not have a negative influence on the crop flow or the grain quality. The booster bar increases threshing efficiency in hard-to-thresh crops without closing the de-awning plates, allowing maximum separation at the concave area.

NOTE: The booster bar is standard on the T670.

Threshing and separation concept T-Series

Functional components

1. Large, 660-mm (26-in.) diameter threshing cylinder with 10 rasp bars and increased concave area
2. Smooth stripper roll and enlarged overshoot beater
3. Enlarged, 800-mm (31.5-in.) separator with high-performance separation grate
4. Eight-wing, 400-mm (15.7-in.) rear beater and rear beater grate
5. Seven-step straw walker design with welded or optional bolted universal and corn-cob mix (CCM) grids

Large, 660-mm (26-in.) threshing cylinder with 10 rasp bars and enlarged concave

The large, 10-rasp bar threshing cylinder with 660-mm (26-in.) diameter provides excellent grain quality and gentle material handling.

Combined with the enlarged wrapping angle of 124 degrees, this ensures excellent threshing efficiency, providing unmatched capacity even in tough separating conditions.

Four rasp bars are in constant contact with the crop against the concave area for excellent threshing and separating efficiency:

• Provides a large concave area and allows a slow cylinder speed
• Ensures gentle threshing and separation to reduce grain damage
• Large, concave wrapping angle ensures high grain separation right at the beginning and reduces separation load on the straw walkers
• Wide, 1670-mm (65.7-in.) (6-Walker) channel width grants maximum throughput even in tough separating conditions

Stripper drum and overshoot beater

Stripper drum

Overshoot beater

The T-Series threshing system uses a smooth surface stripper roller behind the threshing cylinder to gently direct the material to the overshoot beater. This prevents material from back feeding on the threshing cylinder, eliminating blockages of the cylinder. The stripper roller speed runs at 125 percent ratio of the threshing cylinder speed.

The enlarged, 500-mm (19.7-in.) overshoot beater on the T-Series continues the material flow process. Material travels over the top of the beater and is directed into the separation drum.

Smooth crop flow is achieved without harsh angles or abrupt changes in direction.

The eight-wing beater has a constant speed. The serration design of the wings’ leading edges engage the mat of material and move the high volumes of tough, damp straw without buildup or bunching.

Xtra Large separator and high-performance separator grate (HPS grate)

The 800-mm (31.5-in.) Xtra Large separator drum provides additional separation capacity of the T-Series. Due to the open design, the drum is not heavier in weight than the previous closed design.

The Xtra Large separator drum runs at two factory-installed speeds:

• 760 rpm for small grain and grass seed
• 380 rpm for rape seed and peas and beans

There is an optional 270 rpm speed reduction kit available for corn harvest which is included in the corn package.

Swapping the belt speed can be done easily and quickly by changing the drive pulley via a lever-operated tension pulley.

The Xtra Large separator drum runs at a lower speed compared to the previous design that was operated at 900/450 rpm. While it seems that higher drum speeds result in more efficient separation capacity caused by the higher centrifugal force, the opposite effect has been measured. While the centrifugal force has a vital impact on the separation capacity, speeds of the separator drum that are too high result in low exposure time in the high-performance separator grate. This is shown in the graph below.

Straw walker concept

Seven-step straw walker design

The T-Series has a seven-step straw walker concept. Compared to the previous T Series, the model year 2017 T-Series Straw Walker is extended by 80 mm (3.15 in.), which results in a slightly increased overall straw walker area (+ 0.1m²). The concept of low walker rpm and high walker stroke provides efficient tossing to fluff even largest straw mats and open channels for the free grains to drop through. This results in most efficient grain separation capability. The straw walker is available with welded or bolted universal and CCM grids for best-in-class reconfiguration and ability to retrofit for all crops and conditions.

The straw walker is equipped with a closed walker trough at the rear, which ensures the grain is captured in the trough and feeds evenly on the walker return pan that is mounted below the front section of the walkers. Section dividers on the return pan help to maintain an even distribution of material onto the front chaffer of the cleaning system, even on slopes.

• High throw provides efficient tossing to fluff even the largest straw mats and open channels for the kernels to drop through.
• Maximum grain separation is achieved at the front section due to the impact of the straw mat when hitting the first walker steps.
• Four shallow, angled steps provide maximum separating efficiency.

Different walker grids are available to match all crop and conditions.

Overall threshing and separation system benefits:

• Greater level of productivity due to the enlarged concave wrapping angle, Xtra Large separator drum, and the high-performance separator grate
• Best-in-class grain and straw quality can be achieved with the threshing and separating concept
• Fast and easy adoption for different crops
• Lower power consumption and excellent straw quality, making this combine the optimal choice for straw producers

Rear beater and rear beater grate

Rear beater

The 400-mm (15.7-in.) rear beater on the T-Series continues the material flow process. The beater delivers material to the straw walkers. The beater is driven directly from the Xtra Large separator drum and is operated at two speeds.

• 900 rpm for small grain and grass seed
• 450 rpm for rape seed, corn, peas, and beans

A separation grate is mounted underneath the rear beater. The grate is adjustable with a handle on the right side.

Two positions are available:

• Wide position recommended in rape seed, corn, peas, beans, or other sensitive crops
• Narrow position for small grain or grass seed

Inside the T-Series threshing and separation system is an eight-winged, rear beater drum that separates the remaining grains out of the straw mat thanks to the rear beater grate, which provides additional active separation area.

Comparison of separator speed

Comparison separator speed

The red line indicates the performance delta at a loss level of one percent between the different separator speeds.

In combination with the new high performance separator grate, which features a dual design, the first three-quarters of the grate are equipped with wire-grate design, and the last quarter of the grate is equipped with a finger-rake design.

The dual design of the high-performance separator grate provides a boost in separation capacity and does not require manual adjustments that the previous finger rake grate did with the swing in/out function of the two finger rows in tough separating conditions.

The graph below shows the separation performance of two T670s equipped with a 630R Platform running in the same field at same threshing settings. The machine with the high-performance grate clearly shows additional separation capacity compared to the machine with the 800-mm (31.5-in.) Xtra Large separator grate and an updated finger-rake design based separator grate.