Knife Speed; Checking Knife Speed - MacDon FlexDraper FD1 Series Operator's Manual

3.7.8 Knife Speed

The header knife drive is powered by the float module's hydraulic pump which is driven by the combine feeder
house. There is no separate adjustment to control the knife speed.
IMPORTANT:
For variable speed feeder houses, the rpm values in
Table
3.8 Feeder House Speed, page 77
MINIMUM feeder house speeds. Reduce the flow to the
knife drive motor if operating above these rpm values to
prevent knife over-speeding and knife failure.
IMPORTANT:
Ensure the knife speed is within the range of rpm values
in Table
3.9 FD1 Header Knife Speed, page
to
Checking Knife Speed, page
IMPORTANT:
Under normal cutting conditions, knife speed taken at
the knife drive pulley should be set to 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.
10. The rear shaft speed on Lexion combines is 420 rpm (speed shown on cab display monitor also will be 420).
The output shaft speed is actually 750 rpm.
147831
OPERATION
represent the
77. Refer
77.
Table 3.8 Feeder House Speed
Combine
John Deere
Case IH
Gleaner
Massey Ferguson
Challenger
New Holland
Lexion
10
Table 3.9 FD1 Header Knife Speed
Header Size
(ft.)
30
35
40
45
77
Feeder House Speed
(rpm)
490
580
625
625
625
580
420
Recommended Knife Drive
Speed Range (rpm)
Single-Knife Double-Knife
Drive Drive
—
600–700
—
550–650
525–600 550–700
—
550–700
Revision A