TM
Model 4900M0290-01
Rev. 8/19 6-23
Lubrication and Maintenance
15" SEED OPENER DISC BLADE/BEARING ASSEMBLY
Approximately /" - 1½"
blade-to-blade contact.
Maintain approximately 1" ± ½" (3 ± 5 cm) of blade-to-blade
contact to properly open and form seed trench. As blade
diameter decreases due to wear, it is necessary to relocate
machine bushings from inside to outside to maintain
1" ± ½" (3 ± 5 cm) of contact.
NOTE: Proper blade clearance is critical. Blades should
have 1" ± ½"
(3 ± 5 cm)
contact in this area. When blades
are turned by hand in opposite directions against each
other, there should be only light resistance to turning.
Re-adjust blade scraper if necessary to center it between
the blades.
NOTE: Replace blades If proper blade-to-blade contact
cannot be maintained after relocating machine bushings or
if blade diameter wears below 14½" (36.8 cm).
REPLACE DISC BLADE/BEARING ASSEMBLY
NOTE: Only bearing may need to be replaced if there is excessive endplay or if bearing sounds or feels rough
when disc blade is rotated.
1. Remove gauge wheel, scraper, and bearing dust cap.
2. Remove cap screw, washer and disc blade/bearing assembly. Machine bushings between shank and disc blade
are used to maintain approximate 1" ± ½"
(3 ± 5 cm)
of blade-to-blade contact.
3. Install machine bushing(s), new disc blade bearing assembly, washer and cap screw. Torque "-11 Grade 5 cap
screw to 110 ft-lb (149.14 N-m).
NOTE: Replace disc blades only with disc blades of equal thickness.
4. Install bearing dust cap, scraper, and gauge wheel.
Left hand side of opener uses a left
hand threaded cap screw. DO NOT OVER
TIGHTEN. Damage to shank threads
require replacement of row unit shank
assembly.
NOTICE
Excessive blade contact may result
in premature disc opener bearing/
hub failures and excessive wear on
seed tube guard/inner scraper. When
properly adjusted, if one blade is held
in fixed position, opposite blade should
rotate with less than
5 pounds force (22
newtons)
at outer edge of blade.
NOTICE
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