Great Plains YP1625 Operator Manual - Manual (Page 67)

Great Plains Manufacturing, Inc. Adjustments 63
07/09/2009 401-226M
Setting Relief Valve
A relief valve is mounted directly above the pump to pro-
tect the manifold and pump from excessive pressure.
Any product that dumps over the relief valve will dis-
charge from the dump line
.
To set relief valve:
Refer to Figure 84
1.
Unlock plastic jam nut from relief valve knob .
2. Unscrew knob clockwise until it loses contact with
internal spring.
3. Screw knob counterclockwise two turns. Start at this
setting.
4. Observe manifold gauge . Watch for relief valve
discharge while operating in the field.
5. If valve is dumping product and gauge reads under
85 psi, stop tractor and turn knob clockwise
1 ⁄
4
turn.
Continue operating at normal field speed. Repeat
this step as needed until no product is discharged
from relief valve.
6. If pressure gauge reads above 85 psi, change to a
larger orifice. Go to step 2. Repeat steps.
Strainer
Refer to Figure 85
A Banjo brand strainer is supplied with the fertilizer pump
option. It is plumbed before the Hypro pump. The stan-
dard 80 mesh screen
should be suitable for most
applications. Other screen sizes are available from Banjo
Corporation.
DANGER
!
Wear protective gloves when changing screens.
If changing screen sizes, keep in mind the following.
• A smaller mesh (100) will keep very small manifold ori-
fice 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 resulting in a reduced application rate.
• Mesh sizes: (Smallest) 100, 80, 50, 30 (Largest)
Figure 84
Pressure Relief Valve
22502
2
3
4
1
1
2 3
4
1
Figure 85
Strainer
18418
5
5