214323 83 Revision A
Table 3.10 FD75 Header Knife Speed
Header Size
(m [ft.])
Recommended Knife Drive
Speed Range (rpm)
Single-Knife
Drive
Double-Knife
Drive
9.1 (30)
600–700
—
10.6 (35)
550–650
—
12.2 (40)
525–600 550–700
13.7 (45)
—
550–700
IMPORTANT:
Ensure the knife speed is within the range of rpm values
in Table 3.10, page 83. Refer to Checking Knife Speed,
page 83 .
IMPORTANT:
Under normal cutting conditions, knife speed taken at
the knife drive pulley should be set between 600–640
rpm (1200–1280 spm). If set to low side of chart, you
could experience knife stalling.
Checking Knife Speed
DANGER
To avoid bodily injury or death from unexpected start-up of machine, always stop engine and remove key
from ignition before leaving operator’s seat for any reason.
Figure 3.88: Left Endshield
1. Stop the combine engine and remove the key from
the ignition.
2. Open the left endshield (A).
Figure 3.89: Knife Drive Pulley
WARNING
Check to be sure all bystanders have cleared the area.
3. Start the combine engine, engage the header drive, and
run the combine at operating rpm.
4. Run adapter and header for 10 minutes to warm up oil
to 38°C (100°F).
NOTE:
Combines with variable speed feeder houses should
check knife speed with feeder house at slowest speed.
Refer to Table 3.9, page 82 for combine feeder house
speed values.
5. Measure the rpm of the knife drive box pulley (A) with a
hand-held tachometer.
OPERATION
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