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XR871 & XR851 Harrows

XR8™ Series HarrowsBourgault Main

XR871™ eXtended RANGE HARROWS

XR851™ eXtended RANGE HEAVY HARROWS

XR871 eXtended Range Harrow

AVAILABLE IN 2 WIDTHS

ADF™ (Adjustable DownForce™ System)

The ground-breaking advancement that sets the Bourgault eXtended Range harrow series apart from the competition is the patented in-cab Adjustable DownForce™ System.

This design employs hydraulically controlled downforce or upforce to each individual harrow section, ensuring a uniform field finish even when contouring to the extremes!

How ADF™ is Achieved

Adjustable DownForce™ borrows technology from the Bourgault independent drill design to control downforce onto the harrow sections with hydraulic cylinders and parallel linkage mounts. As the hydraulic pressure is increased, the force is applied evenly from the front to the back of each section.

The ADF™ feature is unique in that it:

is constant regardless of contour position,
is isolated from other adjustments,
is easily adjustable, and,
can instantly be placed into float at the headlands to prevent over harrowing of headlands and the bunching of straw.

ADF™ can be manually set on the hitch of the harrow, or a convenient in-cab 500 Control Box option is available for on-the-go adjustments.

Adjustable UpForce

Taking the ADF™ design even further is the addition of upforce. In certain conditions the weight of the sections themselves can become too aggressive to do a good job. ADF™ reverses the hydraulic flow taking weight off of the section, thus operating much like a light harrow (just tickling the ground).

The Benefit of ADF™

With the competition's harrows, changes to the tine angle or section angle will inadvertently affect the set down pressure, and visa versa.

With the Bourgault XR Series Harrows, the ADF™ feature isolates the application of down or up force from tine angle or section angle, so adjustments to one setting does not affect the other two. You can set the XR Series Harrows more quickly to achieve desired results, particularly in challenging and variable conditions.

Once the hydraulic pressure is set, downforce remains constant even through hilly land and water runs.

Settings Guideline

The beauty of the XR™ harrow series is that changes to one setting do not affect the others.

Once the optimal tine angle is found, changes to the Adjustable DownForce (ADF™) and boom angle (pitch) will have little impact on the tine angle, shortening the time and reducing the frustration to achieve a desired field finish.

Below is suggested guidelines for setting the XR harrow:

Set the tine angle based on the volume of straw that you want held in the harrow to achieve the desired results. To increase the amount of straw being carried, adjust the tines so that they stand taller, decrease the tine angle to reduce the amount of straw being carried. These changes do not change the down pressure applied by the XR™ Harrow.

Set the boom angle to dictate where the straw is being carried. Roll it forward to carry the straw in the front of the section; this is useful for tougher field and straw conditions. Roll the boom back to carry the straw at the rear of the harrow frame; this is more useful for breaking up straw in drier field and straw conditions. Again, these changes do not change the down pressure applied by the XR™ Harrow.

Adjustable DownForce™ pressure (down/up) is adjusted with the ADF™ valve, either in the cab on the 500 Control Box or on the hitch. Increase the pressure to do more incorporation, soil scratching and collecting of straw. Decrease the pressure to reduce damage to standing stubble.

The solid pull arm system controls the folding and unfolding of the Bourgault XR Harrows

The XR871™ and XR851™ are equipped with a solid pull arm system. The solid pull arm provides secure control when folding and unfolding and excellent stability of the wings in fields with hills or runs.

EFFECTIVE TINE OPTIONS

The XR871™ is standard equipped with 7 rows of ½" x 22" MAX LIFE carbide infused tines creating an effective 1.43" spacing across the entire unit.
The XR851™ features 5 rows of ⅝" x 26" carbide tines for an effective 2.4" row spacing.

EXCEPTIONAL FLOTATION

The XR871™ & XR851™ Harrows are grounded with large, hi-flotation 500/60R22.5 radial tires all-around, providing unprecedented flotation for a harrow bar.

The wing wheels are mounted in board to avoid field hazards such as posts, trees and rock piles.
Hydraulically controlled boom wheels greatly reduce the distance required to fold and unfold the unit.

Consistent Results in Hills

Maintain the Harrow Angle of Attack

The XR™ harrow sections are connected to the booms with parallel arms; this parallel arm design maintains section tilt, or angle of attack, regardless of height adjustment or field contouring.

On Level Ground

When going over level ground, both conventional and parallel link mounting systems work similarly.

In The Hills

The parallel arm design maintains section tilt, or angle of attack regardless of the land contour. This feature avoids the "digging in" and "dumping" that conventional harrow designs are prone to on hilly land.

Each 10' section acts independently of each other, adding to the consistent finish across the entire width of the XR™ Harrows.

Experience Sectional Freedom

Harrow sections are designed for independent vertical travel, delivering uniform results even in hilly conditions.

Fully Independent Sections

Each of the 10' harrow sections have a full 26" of vertical travel, completely independent of it's neighbouring sections. This is why you will achieve the most consistent results of any field harrow, particularly in uneven land or around drainage ditches.

Convenient In-Cab Control

The XR™ Series Harrows feature the 500 Control Box to provide incremental downforce adjustment, switch to upforce, or go into float mode all from the seat of the tractor.

LEFT SWITCH - Raise / Lower Toolbar
RIGHT SWITCH - Power
CENTER SWITCH - Multifunction touch screen displays the set pressure, as well as the ability to adjust. It also allows the Operator to turn off the down pressure if the Operator encounters a soft spot in the field.

Additional Resources

A comprehensive library of Bourgault product information is only a click away!
Visit the Bourgault Electronic Documentation System for parts and operational documentation.