Great Plains YP4025A Operator Manual - Manual (Page 71)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 67
2013-04-24 Table of Contents Index 401-627M
Ground Drive Pump
Refer to Figure 70
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:
If planting without fertilizing, the pump must not be allowed to
run dry. Disconnect the chain or remove a sprocket. The
ground drive contact wheel and chain system operates
whenever the planter is lowered and in motion.
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. Moni-
tor the pressure gauge for a reduction in pressure that
indicates a plugged strainer screen.
Figure 70
John Blue Pump
Sprocket and Dial
28416
2
4
3
1
1
2
3
4
Figure 71
Strainer
21965