Great Plains 3PYP Operator Manual - Manual (Page 63)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 59
2014-09-09 Table of Contents Index 401-312M
Fertilizer Relief Valve
Refer to Figure 60
A relief valve and pressure gauge are mounted at
the fertilizer inlet connection point to the tractor, and
provides the fertilizer feed to the manifold (manifold
not shown). The relief valve protects the manifold, lines
and fittings from excessive pressure. Any product that
dumps over the relief valve will discharge from the dump
line
➄
in relative safety, rather than appearing
unpredictably at some random point in the system.
To set relief valve:
1. Unlock plastic jam nut from relief valve knob.
2. Unscrew knob clockwise (looking down) until it
loses contact with internal spring.
3. Screw knob counterclockwise two turns.
Start at this setting.
4. Observe manifold gauge and watch for relief valve
dump line 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 dump line
.
6. If the pressure gauge reads above 85 psi, change to
a larger orifice. Go to step 2 and repeat.
Ground Drive Fertilizer Pump
Planters ordered without a fertilizer pump system, or
which have an older shaft-driven pump may be upgraded
to ground drive CDS-John Blue
®
piston pump:
For operations, see the Seed Rate manual.
Option Packages
Part
Number
3PYP JB GND DRV PSITON PMP ASM 407-422A
Figure 60
Fertilizer Relief Valve
25164
3
1
6
7
5
4
2
1 2
3
4
3
7
7
2
5
7
5
28416