MacDon FD75 OM - Manual (Page 65)

OPERATION
4.7 Header Operating Variables
Satisfactory function of the header in all situations requires making proper adjustments to suit various crops
and conditions.
Correct operation reduces crop loss and allows cutting of more acres. As well, proper adjustments and timely
maintenance will increase the length of service you receive from the machine.
The variables listed below and detailed on the following pages will affect the performance of the machine. You will
quickly become adept at adjusting the machine to get the desired results.
Variable Section
Cutting height 4.7.1 Cutting Height, page 51
Header float 4.7.3 Header Float, page 137
Header angle 4.7.4 Header Angle, page 145
Reel speed 4.7.5 Reel Speed, page 146
Ground speed 4.7.6 Ground Speed, page 147
Draper speed 4.7.7 Draper Speed, page 148
Knife speed 4.7.8 Knife Speed, page 150
Reel height 4.7.9 Reel Height, page 151
Reel fore-aft position 4.7.10 Reel Fore-Aft Position, page 152
Reel tine pitch 4.7.11 Reel Tine Pitch, page 156
Crop divider rods 4.7.13 Crop Divider Rods, page 163
4.7.1 Cutting Height
The header is designed to allow an Operator to cut the crop above the ground for a desired stubble height, or
to cut the crop at ground level with the header on the ground. Cutting height will vary, depending on type of
crop, crop condition, etc.
Cutting Off The Ground
The stabilizing wheel system is designed to minimize bouncing at the header ends and may be used to float the
headers to achieve an even cutting height when cutting above ground level in cereal grains. The system can
provide very even stubble height and greatly reduces operator fatigue.
Cutting height is controlled with a combination of the combine header height control and a stabilizer wheel system,
or a stabilizer/slow speed transport wheel system.
If stabilizer wheels are installed, refer to Adjusting Stabilizer Wheels, page 53 to change the wheel position.
If stabilizer/slow speed transport wheels are installed, refer to Adjusting Stabilizer/Slow Speed Transport Wheels,
page 52 to change the wheel position.
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