Great Plains 3N-3020 Operator Manual - Manual (Page 54)

3N-3010 and 3N-3020
196-366M 3/29/2012
52
Opener Maintenance
20 Series Opener Side Wheels
Refer to Figure 39
1. Lift opener side wheel off the ground. Move
tire in and out to check for end play. Check for
roughness in bearing by rotating wheel. If the
bearings are rough, inspect and replace if
necessary.
2. Check for the correct number of flat washers
(1) and machine washer (8) between the side
gauge wheel (2) and the wheel arm (3). There
must be three flat washers (1) and one ma-
chine washer (8) between the wheel bearing
and arm with the machine washer (8) next to
the arm. There should be three flat washers
(1) and one lock washer (9) on the outside of
the wheel. When installed, the wheel should
turn freely and not hit the arm at the curve. Do
not add any more washers than necessary.
3. Disassemble side-gauge-wheel arm from
unit. Remove bushing (4) from sleeve (5) and
check bushing for wear. Replace bushing if
necessary.
4. When reinstalling side gauge wheels, align
tab on hex adjustment (6) with notch in bush-
ing. Replace bolt and tighten.
5. To prevent plugging loosen clamp bolt (7) and
slide arm inward to take up gap between side
wheel and disk blade.
6. Adjust side gauge wheels. Refer to “Adjust-
ments,” page 37.
Opener Disks
Refer to Figure 40
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. Check disk blades for wear.
3. When reinstalling disk blades, put two shims
(4) between bearing and shank on one blade
and two shims under bolt. Tighten bolt. On
opposite side, reinstall blade with two shims
between bearing and shank and two shims
under bolt. Tighten bolt.
Disk edges are sharp. Be careful when working in this
area.
20432
1/2 inch to
1 3/4 inches
18412
Figure 39
Figure 40
4. Check contact point between disk blades.
Place a piece of paper in top gap between
disk blades. Bring paper down until it stops. In
lower gap place another piece of paper. Bring
paper up until it stops. The distance must be
between 1/2 and 1 3/4 inches. Add or remove
shims as needed to get the correct contact
point.