HEADER OPERATION – D SERIES
Form 169304 79 Model Year - 2009
6.5.5 Knife Speed
The ideal cutting speed of the knife should be
such that a clean cut is achieved. Crop types
and conditions usually influence the knife and
forward speeds.
The knife speed is manually set by making
adjustments to the knife drive pump and has
been pre-set at the factory at approximately the
mid-point (15-18 gpm (57-68 L/min)). Set the
knife speed according to the header being used.
See the following table.
NOTE
The knife speed should stay within the
range specified for each header.
HEADER
DESCRIPTION
KNIFE SPEED
(Strokes Per Minute [SPM])
TYPE SIZE MINIMUM MAXIMUM
Draper DK 15 1500 1900
Draper DK 20 & 25 1400 1700
Draper DK 35
1200
1500
Draper DK 30 1600
Draper DK 40 1100 1400
Draper SK 20 & 25
1200
1500
Draper SK 30 1450
Draper SK 35 1100 1400
Draper SK 40 1050 1300
Grass Seed
Header
All 1400 1950
If the machine is equipped with the appropriate
sensor, the CDM will notify the operator when
the knife speed reaches an overload pre-set
(usually 75% of knife speed). The pre-set can
be changed on the CDM. Refer to Section
5.18.5 CDM Programming.
Use the following procedure to set the knife
speed. See chart on next page for settings:
CAUTION
Check to be sure all bystanders have cleared
the area.
a. Run engine at 2600 rpm with the header drive
engaged.
b. Check knife speed at the wobble box pulley with
a hand-held tachometer. If required, adjust knife
speed as follows:
DANGER
Stop engine and remove key from ignition
before leaving operator's seat for any
reason. A child or even a pet could engage
an idling machine.
1. Shutdown engine.
2. Loosen jam-nut (A).
3. One revolution clockwise of adjuster screw
(B) will decrease flow by approx 1 gpm.
4. One revolution counter clockwise will
decrease flow by approx 1 gpm.
5. Once adjustment has been made retorque
jam nut (A) as shown.
c. Start engine and recheck knife speed.
(continued next page)
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