Great Plains YP4025F-1670 Operator Manual - Manual (Page 67)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 63
2014-09-08 Table of Contents Index 401-571M
Ground Drive Pump
Refer to Figure 65
With a Type 2 fertilizer system, the pump is driven by a
ground contact wheel . Fertilizer rate is independent of
seed rate. Fertilizer coarse rate is set by a driving
sprocket
on the ground drive assembly, and fine rate
is adjusted at the setting hub (dial) on the pump.
Equipment Damage/Material Loss Risks:
The ground drive contact wheel and chain system will operate
whenever the planter is lowered and in motion. If planting
without fertilizing, the pump must not be allowed to run dry.
Disconnect the chain or remove a sprocket.
Note: When a Type 3 fertilizer system is installed, the
pump is mounted at the source (not on the planter),
usually on a tank cart.
For sprocket and dial settings, refer to the Seed Rate
manual.
Liquid Fertilizer Strainer(s)
The optional ground drive fertilizer pump systems
include a strainer at the pump. The Type 3 system relies
on strainers at the source, usually on a tank cart.
The strainer(s) are delivered with a mesh screen. You
need to check that each screen is an appropriate size for
the orifice plates you plan to use.
If changing screen sizes, keep in mind the following:
• Generally, select a mesh screen the same or slightly
smaller than the orifice size.
• A substantially smaller mesh (e.g. 100) will reduce
manifold orifice plates plugging so often, but the
strainer screen will have to be cleaned more often.
• A much larger mesh (e.g. 50 or 30) will pass more
material but should only be considered when using
large manifold orifice plates.
• A plugged or partially plugged screen starves the
pump and results in a reduced application rate.
Monitor the pressure gauge for a reduction in pressure
that indicates a plugged strainer screen.
Figure 65
John Blue Pump
Sprocket and Dial
28416
2
4
3
1
1
2
3
4
Figure 66
Strainer
21965