Great Plains 3PYPA Operator Manual - Manual (Page 70)

66 3PYPA Table of Contents Index Great Plains Manufacturing, Inc.
401-647M Table of Contents Index 03/20/2012
Fertilizer Row Shut-Off
Refer to Figure 75
Fertilizer booms for twin-row planter include caps for
shutting off flow at unused rows. If switching from twin-
row to single-row operation, and applying fertilizer,
replace the drop line nozzles
with 832-042C caps
at unused rows.
The orifice plates may be removed or left in place.
Adjust pump for new rate. Review orifice size selection
for the new rate. Keep in mind that the row spacing has
changed.
Material Loss Risk:
Do not apply materials without first reviewing setup. Shutting
off rows does not change the application rate. Unless the pump
is reset, it operates at the prior rate, doubling the flow at each
nozzle. This can result in excess pressure, and material loss at
the relief valve.
Null4:
Fertilizer Relief Valve
Refer to Figure 76
When a fertilizer system is installed, a relief valve
and
pressure gauge are mounted near the fertilizer inlet
at the hitch and provides the fertilizer feed to the man-
ifold (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
in relative safety.
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
65 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 dis-
charged from relief valve dump line
.
6. If the pressure gauge reads above 65 psi, change to
a larger orifice. Go to step 2 and repeat.
Null4:
Figure 75
Fertilizer Drop Line Shutoff
29984
Agricultural Chemical Hazard:
Wear protective gloves when
exchanging nozzles and caps.
5
1
2
3
4
3 5
1
Null4:
Figure 76
Fertilizer Relief Valve
25164
1
2
3
4
5
6
7
1
2 3
4
5
6
7
7
2
5
7
5