Great Plains YP825A3P Operator Manual - Manual (Page 44)

40 YP4-6-825A3P Table of Contents Index Great Plains Manufacturing, Inc.
401-652M Table of Contents Index 2013-05-28
3. Rate: Range Sprockets
Range sprockets provide coarse control of seed rate.
Refer to Figure 29 and Figure 30
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. 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
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 82). Re-engage idlers for
1 ⁄
4
inch (6.4 mm) slack in longest chain span.
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 30
Each Seed Rate chart row has a unique pairing of
DRIVING and DRIVEN Transmission sprocket.
To change Transmission:
a. 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
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 82). Re-engage idlers for
1 ⁄
4
inch (6.4 mm) slack in longest chain span.
Figure 29
Range Sprockets
31030
3
DRIVING
DRIVEN 3
1
Figure 30
Transmission Sprockets
31030
4
1
DRIVING
DRIVEN
4
1