Great Plains 3PNG15 Operator Manual - Manual (Page 30)

26 3PNG12 and 3PNG15 Great Plains Manufacturing, Inc.
202-553M 10/06/2008
Disc Blade Adjustments
Opener disc angle and stagger is not adjustable, but
disc-to-disc spacing is, and may need attention as discs
experience normal wear. Spacers must be reset when
blades are replaced.
Refer to Figure 17
The ideal spacing causes the blades to be in contact for
about one inch. If you insert two pieces of paper between
the blades, the gap between them should be 0 to 1.75in
(0-4.4cm). If the blades do not touch, they should at least
be close enough so that a business card
a
encounters
some friction when passing between them.
If the contact region is significantly larger or the gap too
wide, it needs to be adjusted by moving one or more
spacer washers. If the contact region varies with blade
rotation, one or both blades is likely bent and in need of
replacement. If removing all spacers cannot bring the
blades into contact, they are worn out and need replac-
ing.
Adjusting Disc Contact
!
CAUTION
Row unit disc blades may be sharp. Use caution when mak-
ing adjustments in this area.
Refer to Figure 18
1.
Raise the drill and lock the lift cylinders.
2. Remove the bolt retaining the opener disc on
one side. Carefully remove the disc, noting how
many spacers
are outside the disc and inside the
disc. Do not lose the hub components and spacer
washers
.
3. To reduce the spacing between the discs (the nor-
mal case), move one spacer washer from the inside
to the outside of the disc.
4. Re-assemble and check disc contact.
a. The cover of this manual is about the same thickness, 0.008in or 0.2mm.
Figure 17
Checking Disc Contact
26451
Figure 18
Adjusting Disc Spacers
26385
3
1
2
2
2
2
1
2
3