Great Plains 1625AHL Material Rate - Manual (Page 72)

68 1625AHD/AHL Table of Contents Great Plains Manufacturing, Inc.
411-020B Table of Contents 2014-03-17
Refer to Figure 14
6. At the rear (long mount) row unit of each pair, note
which sprocket tooth is at the index mark
. If the
sprocket is already at the chart value, skip to
step 12. Otherwise, complete step 7 through step 10
for that row.
Refer to Figure 15
7. Place the timing tool over the meter shaft. Attach
a 9.5 mm (
3 ⁄
8
inch) socket wrench to aid in rotation.
Sweep the tool
c
tooth under the chain, rotating in the
direction opposite of that desired for sprocket
adjustment.
Each clockwise rotation of the timing tool advances
the sprocket by one tooth.
Each counter-clockwise rotation of the timing tool
retards the sprocket by one tooth.
8. Advance or retard the sprocket until the desired tooth
number is at the index mark. Hold the sprocket
stationary, and re-mount the chain, making sure the
chain is taut in the top loop.
9. Rotate meter shaft backward, or rotate wing drive
shaft forward to tension chain. Re-check that front
row sprocket is still at “1”.
10. Check the position of the rear row sprocket. The
tooth tip at, or just ahead of the index mark must be
the tooth called for by the chart. If not, release spring
and re-mount chain.
11. Repeat step 4 through step 10 for each row pair.
12. Re-install seed discs and meter covers. No particular
disc orientation is required during seed disc
installation. The disc is symmetrical about all four
seat lobes.
c. If the timing tool is not available, remove the idler tensioning spring to adjust the sprocket position. Rotate meter shaft backward (if
meter empty, otherwise forward one full rotation), and re-check indexing with normal tension on chain.
Figure 14
Sprocket Index Check
29628
2
2
3
Figure 15
Adjusting Sprocket Index
31444
3