MacDon FD70 for Combine Operators - Manual (Page 102)

SECTION 9. OPERATION
Form 169006
100
Revision D
9.11.8 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 adapters, and
780 rpm for AGCO and Lexion adapters.
IMPORTANT
For variable speed feeder houses, this
will be the minimum speed setting.
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.
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 D60/FD70/CA20 Technical Manual
.
HEADER SIZE
RECOMMENDED KNIFE DRIVE
SPEED RANGE (RPM)
SKD DKD
25 FT 550 - 675 600 - 800
30 FT 550 - 650 600 - 725
35 FT 550 - 600 550 - 700
40 FT 525 - 600 550 - 650
45 FT N/A 550 - 650
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 wobble 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 wobble box pulley rpm is
necessary, contact your MacDon Dealer or refer
to the D60/FD70/CA20 Technical Manual.
9.11.9 Reel Height
Depending on crop height, adjust reel height to
carry material through the sickle onto the drapers.
Operate combine hydraulics as required. Refer
also to Section 9.11.10 Reel Fore-Aft Position.
REEL HEIGHT CHART
CROP CONDITION REEL POSITION
Combining Down Rice
Down
(Also Increase Reel Speed
and/or Cam Setting)
Bushy or Heavy Standing Up
Indications that reel may be too low are:
 crop loss over the header back tube,
 disturbance of crop on the drapers by the
reel fingers, or
 crop being pushed down by the tine
tubes.
IMPORTANT
Maintain adequate clearance to prevent
fingers contacting the knife or the
ground. Refer to Section 10.14.1 (D50,
D60) or 10.14.2 (FD70) Reel Clearance
to Cutterbar.