MacDon FD75 OM - Manual (Page 159)

OPERATION
NOTE:
The following steps are only required if the above
has not worked.
3. Remove the linkage cover. Refer to Removing Linkage
Covers, page 40 .
4. Retrieve the supplied torque wrench (A) that is stored
on the adapter frame on the right-hand side.
Figure 4.216
5. Place the torque wrench (A) on bolt (B) and use it to
move the wing until the lock engages.
6. Replace the torque wrench (A) and reinstall the linkage
cover.
7. The wings will not move relative to the header.
Figure 4.217
4.7.4 Header Angle
Header angle is the angle between the drapers and the ground, and is adjustable to accommodate crop conditions
and/or soil type.
The header angle (A) is a critical factor for effective cutting
on the ground applications because it determines the
actual distance (B) between the sickle and the ground.
The header rotates about the point of skid shoe/ground
contact (C) by adjusting the length of the center-link
thereby adjusting the position of the guards and sickle.
Header angle (A) is synonymous with guard angle (D)
which is the angle between the guard upper surface and
the ground.
Figure 4.218: Header Angle
169894 145 Revision A