Great Plains YP825AR Material Rate User Manual
Page 21
Great Plains Manufacturing, Inc.
Sprocket Indexing (Stagger)
17
2013-11-11
401-923B
Refer to Figure 12
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 2.
Otherwise, complete step 7 through step 10 for that
row.
Refer to Figure 13
7.
Place the timing tool
over the meter shaft. Attach
a
3
⁄
8
inch socket wrench to aid in rotation.
Sweep the tool
a
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.
a. 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 12
Sprocket Index Check
29628
2
2
3
Figure 13
Adjusting Sprocket Index
31444
3