Great Plains 3N-3020 Operator Manual - Manual (Page 55)

3/29/2012 196-366M
53 Maintenance and Lubrication
20 Series Opener Disk Spreader
Refer to Figure 41
1. On 20 Series openers, remove side gauge
wheel arm and wheel assembly by removing
5/8 inch bolt (4) to access opener disks and
spreaders.
2. With the unit raised, check blade spreader (1)
for wear. Replace spreader if it is 7/16 inch
wide or narrower, or if opener is plugging with
dirt. To replace, remove disk blade (3). Drive
out roll pins (2) and install a new spreader.
NOTE: Disk spreaders are loose to move freely.
Seed Flap Replacement (s/n 1022UU-)
Refer to Figure 42
To replace a seed flap use a needle nose or simi-
lar tool and squeeze together the tabs, as shown.
Pull plastic seed flap down out of metal bracket.
If replacing with 817-349C: Push new seed flap
up through metal bracket until tabs on seed flap
snap in place.
Seed Flap Replacement (s/n 1023UU+)
Refer to Figure 43
If replacing with 816-302C seed flap use a nee-
dle nose pliers or similar tool to grasp “T” top of
flap. Pull upward to pull flap up out of metal brack-
et
.
Push new seed flap down through metal brack-
et until flap snaps into place with “T” top resting
on top of bracket.
Drive System
For proper operation and to prevent downtime and
repair, keep drive chains properly adjusted and lu-
bricated. Regularly check drive chains for excess
slack and wear. Adjust idlers to remove any ex-
cess slack from chains.
NOTE: Be sure chain is installed with the chain
connector link retainer towards the centerline and
the clip opening (split end) facing the opposite
way of the chain travel.
Overtightening chains will reduce bearing, chain and
sprocket life.
20433
1
2
1
2
Figure 41
Squeeze
tabs
Metal
bracket
Figure 42
18398
816-302C
2
1
Figure 43
817-349C
31047