Great Plains 1007NT Operator Manual - Manual (Page 49)

Great Plains Manufacturing, Inc. Maintenance and Lubrication 45
10/06/2010 150-290M
Disc Maintenance
Coulter and opener disc blades wear in normal service,
becoming smaller in diameter. Periodically check blade
diameter, and replace when below the recommended
limits. Discs can also be dented by unusual field hazards,
or bent. Replace damaged blades immediately.
Opener Disc Replacement
Replace 15in (38.1cm) opener discs when re-positioning
spacers no longer brings both blades into the contact as
recommended at “Disc Blade Adjustments” on page
35.
Consult updated Parts Manual for latest disc, or disc
assembly part number.
Coulter Disc Replacement
Replace 17in (43.2cm) coulter blades when adjusting
drill level becomes difficult. Two signs that blade replace-
ment is indicated are:
• Coulter height adjustments drill-wide have used up
nearly all of the available front eyebolt adjustment
range (page 30).
• Coulter blade diameter is close to, or below, 15in
(38.1cm).
See page 52 for replacement and alternate coulter
blades.