Great Plains 1625AHL Material Rate - Manual (Page 105)

Great Plains Manufacturing, Inc. Table of Contents Liquid Fertilizer Rates 101
2014-03-17 Table of Contents 411-020B
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 28
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 turn knob clockwise (looking
down)
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 28
Pressure Relief Valve
28029
2
3
4
1
1
2 3
4
1