McFarlane WDL-2100, Operator'S Manual And Set-Up Instructions, Page: 30 / 57

30
Angle of Attack
Before placing the harrows, you will want to determine the ‘angle of attack’ desired for your
particular application. Refer to Figure 30 to help clarify what is meant by ‘angle of attack.’
McFarlane flexible harrow sections have a built-in system which allows the harrow owner a choice
between a steep or shallow angle of attack. To change the angle of attack, simply reverse the harrow
section and pull it from the other end.
Each angle has its advantages and disadvantages. The steeper angle of attack is for more aggressive
harrowing. However, the steeper the angle, the greater the tendency there is for the sections to clog
with field debris.
Be sure all adjoining harrow sections are set to the same angle. Each section is matched to the one
next to it and may become entangled if the angle settings do not match. It may be desirable to set
the front sections (8-bar on a 16-bar harrow) aggressive and the rear sections less aggressive.
DIRECTION OF TRAVEL
NEUTRAL POSITION
SHALLOW ANGLE OF ATTACK
STEEP ANGLE OF ATTACK
DIRECTION OF TRAVEL
Figure 30
Harrow Identification
The number of teeth on a bar is the same as the first digit of the harrow identification number. The
last number is the number of bars per section. An FH-600-8 would have six teeth per bar and 8 bars;
an FH-800-8 would have eight teeth per bar and 8 bars.
Harrow Configurations
McFarlane harrow sections may be attached in any one of several distinct configurations: 8-bar,
4+4-bar, 12-bar, 6+6-bar, 16-bar, and 8+8-bar. The 8, 12, and 16-bar harrow configurations utilize a
single set of pull points located adjacent to the center bar and wings.
The 4+4, 6+6, and 8+8-bar harrow configurations (also known as dual sections) also utilize a second
set of pull points located at the rear end of the lift arms. Persons assembling an 8, 12, or 16-bar
harrow should
ignore the instructions in
italics
describing the attachment of the rear pull points.
Those assembling a dual section harrow should be sure to follow the instructions for attaching the
rear pull points in
italics
.