Great Plains NTA3007 Operator Manual - Manual (Page 138)

134 NTA907 or NTA3007 Table of Contents Index Great Plains Manufacturing, Inc.
166-371M Table of Contents Index 2012-07-02
Marker Chain Length
If marker fails to reach ground when unfolded, or is
skipping field depressions, the chain is too short.
If marker drags across ground for more than
30 cm (12 inches) before lifting, the chain length is too
long.
Refer to Figure 133
1.
Unfold marker.
2. Adjust/set Marker Extension (page 183) before
adjusting chain length.
3. Remove take-up bolt .
4. Re-insert bolt to obtain an approximate chain length
160 cm (63 inches)
Tighten bolt.
5. Fold, unfold and re-fold marker to validate new chain
length.
6. Thread bolt in (up) until head is flush with inside jam
nut and both are flush with inside of channel.
7. Slowly fold marker while observing disc. If marker
disc drags across ground more than 30 cm (12 in.)
before lifting, the chain is too long.
Marker Grease Seal
Refer to Figure 134
If grease-seal cap
for marker disc hub bearings is
damaged or missing, disassemble and clean hub.
Re-pack with grease and install a new seal or grease
cap.
Figure 133
Marker Chain
21888
1
2
1
2
Figure 134
Marker Bearing and Cap
18795
1
1