
Great Plains Manufacturing, Inc.
Preparation and Setup
23
2019-03-14
195-067M
Refer to Figure 12 on page 22 and Figure 13 at right
4. Release locking discs
on down-pressure valves.
Adjust knobs
on pressure-control valves for
opener down pressure so gauges
are at 2100 psi.
5. While watching gauges on drill, slowly turn knob on
bypass valve counterclockwise. Adjust bypass valve
just until needles on gauges begin to move down
from 2100 psi. Lock bypass valve at this setting.
(See also note below.)
6. Re-adjust pressure-control valves on drill to desired
opener down pressure as explained under
Note: The higher the bypass pressure, the greater the
potential for oil heating and premature tractor
damage. At the same time, for proper opener
operation the bypass valve must be set at least
300 psi above the opener down-pressure setting
when the tractor is at one-half throttle. Therefore,
you should set the bypass valve as low as possible
while staying at least 300 psi above the opener
down pressure setting.
While 2100 psi is a good starting point for setting the
bypass valve, if you consistently operate the drill with low
opener down pressure you can set the bypass valve
below 2100 psi. If you consistently operate the drill with
very high opener down pressure, you may need a
bypass-valve setting above 2100 psi.
Scraper Installation
Optional disk scrapers are not factory installed. To install
them in the field:
1. Remove one or both disk blades to gain safe access
to the mount. Note the position of bushings and
spacers for correct re-assembly (page 63).
2. Position the inside scraper mount
to the rear of
the seed firmer mount
on the opener weldment.
Secure it with two HHCS
3
8
-16
1in hex head bolts,
lock washers and nuts. Insert the bolts from the front.
3. Position the scraper blade
below and behind the
inside scraper mount
, with the notch on top to
machine right.
Secure it loosely with one RHSNB
3
8
-16
1 round
head square neck bolt, flat washer, lock washer and
nut.
4. Re-mount the removed disk blade.
5. Adjust the scraper blade per “
Figure 13
Down Pressure for Bypass
26471
4
5
6
Figure 14
Scraper Installation
26460
2
1
3