Great Plains YP925TD Operator Manual - Manual (Page 44)

40 YP625TD and YP925TD Table of Contents Index Great Plains Manufacturing, Inc.
401-755M Table of Contents Index 02/23/2011
3. Rate: Range Sprockets
Range sprockets provide coarse control of seed rate.
Refer to Figure 26 and Figure 27
All Seed Rate charts specify a DRIVING and DRIVEN
sprocket combination for the Range. Crops with more
than one range are noted as “LOW RANGE” or “HIGH
RANGE” at the top of the chart.
To change Range:
a. Rotate the spring-tensioned idler plate .
Lift chain off the DRIVING and DRIVEN sprockets.
b. Remove pins from shaft ends at DRIVING and
DRIVEN sprockets, as well as at storage shaft
.
Note: There are two or three storage shafts. Their
locations vary depending on machine
configuration.
c. Exchange sprockets so that new DRIVING and
DRIVEN sprocket tooth counts (stamped on sprocket
face) match chart. Re-pin all shafts.
d. Remount chain (see page 86). Re-engage idler plate.
4. Rate: Transmission Sprockets
Transmission sprockets provide fine control of seed rate.
Each chart row provides a rate adjustment of 2 to 3%.
Refer to Figure 27
Each Seed Rate chart row has a unique pairing of
DRIVING and DRIVEN Transmission sprocket.
To change Transmission:
a. Rotate the spring-tensioned idler plate .
Lift chain off the DRIVING and DRIVEN sprockets.
b. Remove pins from shaft ends at DRIVING and
DRIVEN sprockets, as well as at storage shaft
at
left end of frame.
c. Exchange sprockets so that new DRIVING and
DRIVEN sprocket tooth counts (stamped on sprocket
face) match chart. Re-pin all shafts.
d. Remount chain (see page 86). Re-engage idler
plate.
Figure 26
Range Sprockets
31870
DRIVING
DRIVEN
1
2
1
2
Figure 27
Transmission Sprockets
31870
4
DRIVING
DRIVEN
3
2
4
3