Great Plains 3N-4020 Operator Manual - Manual (Page 113)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 109
2013-10-29 Table of Contents Index 196-359M
Marker Chain Length
Refer to Figure 152
With marker unfolded, adjust chain length .
Slowly fold marker while observing disk. If marker disk
slides across the ground more than a foot (30 cm) before
chain and linkage lifts it up, the chain is too long.
Remove bolt and shorten chain one or two links.
Check adjustment by repeating folding process.
If chain is too short when marker is unfolded, it will pre-
vent the marker blade from dropping into field depres-
sions, causing skips in the mark line. Correct this
condition by lengthening chain one or two links.
Electric Clutch Lockup
Refer to Figure 153
In case of clutch failure, clutches can be temporarily
bolted together.
1. Align cutouts at bolt holes .
2. Insert three M8-1.25x14mm long metric bolts .
3. Lock-up bolts are not supplied with the drill.
They are separately available from Great Plains.
Order quantity 9 of part:
802-782C HHCS M8X1.25X14 GR8.8
Note: Use only 14mm length bolts or machine damage
will occur. Longer bolts will damage the clutch.
Shorter bolts may not effect a lock-up.
4. Unbolt torque tab of field coil housing and make
sure it is allowed to move freely.
If you observe half the hole obstructed by a metal disc
, you are not at a cutout.
If the entire hole is obstructed by a metal disc , you are
not at a cutout.
When at a cutout, the bolt will screw in with minimal
resistance until the bolt head reaches the clutch face.
5. On the point row switch box, tag the switch or lamp
for this section to alert the operator that the section
cannot be shut off from the tractor cab.
Equipment Damage/Material Loss Risk:
When lubricating the drill, do not allow lubricant to enter the
clutch, or clutch slippage, and low seed metering, will result.
Figure 152
Marker Chain Length
18962
1
2 1
2
Figure 153
Electric Clutch Lockup
22906
1
3
2
1
2
2
3
4
Figure 154
Clutch Plate Nearly at Cutout
26168
4
1
4