Great Plains YP825A Operator Manual - Manual (Page 55)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 51
2014-08-15 Table of Contents Index 401-651M
3. Rate: Range Sprockets
Range sprockets provide coarse control of seed rate.
Refer to Figure 44 and Figure 45
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 idler plate against the spring to
disengage the idler.
Remove the chain.
b. Remove pins from shaft ends at DRIVING and
DRIVEN sprockets, as well as at storage shaft.
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. Re-engage spring idler.
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 45
Each Seed Rate chart row has a unique pairing of
DRIVING and DRIVEN Transmission sprocket.
To change Transmission:
a. Rotate the idler plate against the spring to
disengage the idler.
Remove the chain.
a. For planters: (YP425A s/n B1008N-) (YP625A s/n
B1043Q-) (YP825A s/n B1014S-)
Loosen the bolt securing the idler plate
.
Disengage the idler.
Remove the chain.
b. Remove pins from shaft ends at DRIVING and
DRIVEN sprockets, as well as at storage shaft.
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. Re-engage spring idler.
Figure 44
Range Sprockets
31870
DRIVING
DRIVEN
3
3
Figure 45
Transmission Sprockets
31870
DRIVING
DRIVEN
4
4
4