Great-plains YP2425A Material Rate User Manual download pdf (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

⁄

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

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 69 70

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Great-plains YP2425A Material Rate User Manual Page 46