MacDon FD75 OM - Manual (Page 165)

OPERATION
Checking Knife Speed
This section contains the procedure for checking the knife speed. If it is higher than the specified range, contact
your MacDon dealer.
WARNING
Stop combine engine and remove key before making
adjustments to machine. A child or even a pet could
engage the drive.
1. Stop combine engine, and remove key from ignition.
2. Open the left endshield (A).
WARNING
Ensure bystanders are clear before starting engine.
Figure 4.225: Left Endshield
3. Start combine engine, engage the header drive, and
run the combine at operating rpm.
4. Measure the rpm of the knife drive box pulley (A) with
a hand-held tachometer.
5. Shut down the combine.
6. Compare measured pulley rpm with the values in the
knife speed chart. Refer to
4.7.8 Knife Speed, page
150 .
7. If it is higher than the specified range for your header,
contact your MacDon dealer.
Figure 4.226: Knife Drive Pulley
4.7.9 Reel Height
The crop type and condition determine the operating height of the reel.
Set reel height to carry material past the knife onto the drapers with minimal disturbance and damage to the cut
crop. Also see
4.7.10 Reel Fore-Aft Position, page 152 .
Table 4.7 Reel Height
Crop Condition Reel Position
Lodged rice Lowered (also change reel speed and/or cam setting)
Bushy or heavy standing (all) Raised
Indications that reel may be too low are:
• Crop loss over header backtube
• Disturbance of crop on drapers by the reel fingers
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