Great Plains YP2425A Material Rate - Manual (Page 46)

44 YP2425A Table of Contents Metric Charts Great Plains Manufacturing, Inc.
401-626B Table of Contents Metric Charts 2012-02-29
Setting Relief Valve
A relief valve is plumbed after the pump outlet to protect
the manifold and pump from excessive pressure. Any
product that dumps over the relief valve will discharge
from the dump line
.
To set relief valve:
Refer to Figure 24
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
65 psi, stop tractor and, looking down, 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 65 psi, change to a
larger orifice. Go to step 2. Repeat steps.
Figure 24
Pressure Relief Valve
28029
2
3
4
1
1
2 3
4
1