MacDon FlexDraper FD1 Series, Operator'S Manual, Page: 95 / 510

OPERATION
3.7.8 Knife Speed
The header knife drive is powered by the fl oat 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
represent the
MINIMUM feeder house speeds. Reduce the fl ow to the
knife drive motor if operating above these rpm values to
prevent knife over-speeding and knife failure.
Table 3.8 Feeder House Speed
Combine
Feeder House Speed
(rpm)
John Deere 490
Case IH 580
Gleaner 625
Massey Ferguson 625
Challenger 625
New Holland 580
Lexion
10
420
IMPORTANT:
Ensure the knife speed is within the range of rpm values
in Table
3.9 FD1 Header Knife Speed, page 77
. Refer
to
Checking Knife Speed, page 77
.
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.
Table 3.9 FD1 Header Knife Speed
Recommended Knife Drive
Speed Range (rpm)
Header Size
(ft.)
Single-Knife
Drive
Double-Knife
Drive
30 600–700
—
35 550–650 —
40 525–600 550–700
45
—
550–700
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
77
Revision A