McFarlane HDL-100-44 Series, Operator'S Manual And Set-Up Instructions, Page: 18 / 55

18
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 the angle of attack, the more aggressive the harrowing action.
However, the steeper the angle, the greater the tendency there is for the sections to clog with field
debris.
DIRECTION OF TRAVEL
NEUTRAL POSITION
SHALLOW ANGLE OF ATTACK
STEEP ANGLE OF ATTACK
DIRECTION OF TRAVEL
Figure 8
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.
Attach the Harrow Sections
Now that you have determined the desired angle of attack and identified the harrow sections,
position the harrow sections on the ground under each pair of lift arms. Refer to the layout
diagrams in appendix C to determine the placement of the harrow sections.
Connect an 8-Bar Section
1. Bolt the pull chains to the front tabs on the front harrow sections. Use 1/2 x 1 1/2 bolts, flat
washers and lock nuts. The chains should be bolted to the bottom of the pull tabs.
2. Bolt the front and rear harrow sections together using two 5/16 x 1 1/2 x 6 dual section
connector links at each pull tab. Use two 1/2 x 2 bolts and lock nuts.
3. Bolt the lift chains to the dual section connector links. Use one 7/16 V-bolt and two lock nuts
on each link. Tighten all dual section connector link bolts.
4. Make sure that the harrow sections match each other, the angle of attack is correct, and the
chains are not twisted.