Great Plains YP1625 Operator Manual - Manual (Page 53)

7/12/2005 401-182M
51 Fertilizer Rate Charts
Strainer
A Banjo brand strainer is supplied with the fertilizer pump
option and is to be plumbed before the Hypro pump. The
standard 80 mesh screen should be suitable for most ap-
plications. Other screen sizes are available from Banjo
Corporation. If changing screen sizes, keep in mind the
following.
• A smaller mesh (100) will keep the very small manifold
orifice plates from plugging so often. However, the
screen will have to be cleaned more often.
• A larger mesh (50) or (30) will pass more material but
should only be considered when using large manifold
orifice plates.
• A plugged or partially plugged screen will starve the
pump and will result in a reduced application rate.
• Mesh sizes: (Smallest) 100, 80, 50, 30 (Largest)
Setting Relief Valve
A relief valve is mounted directly above the pump to protect
the manifold and pump from excessive pressure. Any prod-
uct that dumps over the relief valve will discharge from the
dump line (1).
To set relief valve:
Refer to Figure 60
1. Unlock plastic jam nut from relief-valve knob.
2. Unscrew knob clockwise until it loses contact with in-
ternal spring.
3. Screw knob counterclockwise two turns. Start at this
setting.
4. Observe manifold gauge and watch for relief-valve dis-
charge while operating in the field.
• If valve is dumping product and gauge reads under 85
psi, stop tractor and turn knob clockwise 1/4 turn. Con-
tinue operating at normal field speed. Repeat this step
as needed until no product is discharged from relief
valve.
• If the pressure gauge reads above 85 psi, change to a
larger orifice. Go to step 2 and repeat steps.
Orifice Plates
Refer to Figure 61
In general, the orifice (1) needs to be small enough to cre-
ate at least 5 psi of pressure in the manifold but large
enough to prevent the manifold pressure from exceeding
85 psi. The minimum pressure is required to even out the
flow of fertilizer between rows. To reduce orifice plugging
and pump wear, use the largest orifice practical for your fer-
tilizer application rate. The best pressure range to maintain
is 15-40 psi to ensure optimum distribution while minimiz-
ing leakage.
22502
Knob
Valve
Jam nut
Figure 60
Pressure Relief Valve
Figure 61
Orifice Plate
21983