MacDon CA25 OM - Manual (Page 75)

SECTION 7. OPERATION
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Revision B
7.9.7 Knife Speed
The header knife drive is driven by the adapter
mounted hydraulic pump. The knife drive
speed is factory-set for a feeder house speed of
575 rpm for CNH and John Deere CA25
Adapters, and 780 rpm for AGCO and Lexion
CA25 Adapters.
IMPORTANT
For variable speed feeder houses,
this will be the minimum speed
setting.
IMPORTANT
To operate variable speed feeder
house at greater than minimum
speed, flow to the knife drive motor
must be reduced to prevent
excessive speeds which could result
in premature knife failure.
IMPORTANT
Check that the knife speed is in the
range shown in the chart below
using the procedure that follows.
If adjustment is required, contact
your MacDon Dealer or refer to the
Header Technical Manual.
HEADER SIZE
(FT)
RECOMMENDED KNIFE DRIVE
SPEED RANGE (RPM)
SINGLE KNIFE
DRIVE (SKD)
DOUBLE KNIVE
DRIVE (DKD)
20 N/A
700–850
25 600–725
30 600–700
600–750
35 550–650
40 525–600
550–700
45 N/A
Refer also to Section 7.8.1 Header Settings for
recommended knife speeds in specific crops
and crop conditions.
WARNING
Stop combine engine, and remove key
before making adjustments to machine. A
child or even a pet could engage the drive.
a. Stop combine engine, and remove key from
ignition.
b. Open the LH endshield.
WARNING
Ensure bystanders are clear before
starting.
c. Start combine engine, engage the header drive,
and run the combine at operating rpm.
d. Have someone check the rpm of the sickle
drive box pulley using a hand held tachometer.
e. Shut down the combine.
f. Compare actual pulley rpm with the values in
the chart in the previous column.
g. If adjustment to the sickle drive box pulley rpm
is necessary, contact your MacDon Dealer or
refer to the Header Technical Manual.