Great Plains 3N-3020 Material Rate - Manual (Page 20)

196-366B 4/28/2004
Great Plains Mfg., Inc.
20
• Re-check GP calibration number, with cup setting
and row spacing.
• Re-check planter monitor settings: calibration
number, row spacing, number of rows, swath
width, seed, etc.
• When planting small size seeds and/or at high
rates, if population monitor consistently indicates
a lower population than the GP Controller Con-
sole, contact monitor manufacturer for perfor-
mance specs for that application.
Maintenance
As with any hydraulic system, contamination is the
most common cause of performance problems and
pre-mature wear. Make a special effort to properly
clean quick couples prior to attaching the hoses to
tractor.
Filter
1. All fluid is filtered through the high pressure filter
(PN 18574) and it will provide protection to the hy-
draulic components of your drive if properly man-
itained. It is equipped with a pop-out indicator to
alert that the replaceable element is clogged, and
should be changed immediately if this situation
occurs. Normal service life of the element will vary
based on the precautions that you take to mini-
mize contamination at the couplers and routine
service of the tractor filtration.
To Change the Element
1. Un-screw lower canister from filter, catching and
disposing of used fluid.
2. Remove and discard element.
Refer to Figure 31
3. Install new element (PN 19856).
4. Clean canister threads and lube o-ring with hy-
draulic fluid, then re-install.
Refer to Figure 32
5. Re-set pop-out indicator if necessary.
NOTE: It is a good idea to keep a filter element on
hand and we recommend changing on an annual ba-
sis, at a minimum.
6. Between planting seasons, store cad console in-
side in a relatively stable and dry environment.
7. Avoid direct spray from high pressure washers on
the motor encoder and the external controller box.
These units are sealed from normal moisture, but
high pressure could inject water into the housing.
Figure 31
Filter Element
Figure 32
Pop-Out Indicator