Great-plains YP825AR Material Rate User Manual download pdf (Page 72)

68 YP825AR Table of Contents Metric Charts Great Plains Manufacturing, Inc.

401-923B Table of Contents Metric Charts 2013-11-11

Install Oriﬁce Plates

Refer to Figure 31

9. Insert the plate inside the gasket supplied with the

nozzle . Insert the gasketed plate with the legend

side facing out the nozzle outlet (typically up).

In general, the oriﬁce needs to be small enough to

create enough pressure in the manifold to operate the

check valves in the boom clamps, but not so much that

the system dumps product at the boom relief valve.

The recommend operating pressure is: 15 to 40 psi

Using an oriﬁce size too large can result in unequal ﬂow

at rows, intermittent ﬂow, and ﬂow stoppage at rows

where pressure falls below the 8 psi required to open the

clamp check valve. Using a size too small can cause

excess back-pressure resulting in material dumping at

the boom relief valve.

Use the same size at all active rows.

Row Shutoff

Refer to Figure 31

Unused drop lines may be shut off by replacing the

nozzle with a Great Plains 832-042C cap . Twin row

boom systems separately include caps for half the rows.

When installing a cap:

• It is not necessary to remove the gasketed oriﬁce plate

from inside the clamp. The cap includes its own gasket

that seals at the end of the clamp port.

• Use a tie wrap or other line to secure the loose nozzle

and drop line tubing to the boom.

• Adjust pump and/or oriﬁce plates for new rate and row

spacing.

Mis-Application or Material Loss Risk:

Do not apply materials after row shut-off or row turn-on

without ﬁrst reviewing setup. Merely changing the number of

active rows does not change the application rate. If pump and/

or oriﬁce size changes are not also made, pressures could be

too low or too high.

Equipment Damage Risk:

Plant at or below 8.8 mph (14 kph) with the standard high rate

sprockets installed. The pump is rated for 550 rpm maximum,

which is exceeded at and above 8.9 mph.

Note: Replacement nozzles include gaskets.

Gaskets may also be ordered separately as Great

Plains part number CP18999-EPR.

Agricultural Chemical Hazard:

Wear protective gloves when changing oriﬁce plates and

strainer screens. Consult material manufacturer or supplier

documents for proper handling and steps to take if skin contact

occurs.

Figure 31

Fertilizer Oriﬁce Plate

29984

Orifice Part Port Port

Size Number Diameter Area

20 832-052C 0.020 in 0.20 mm²

28* 832-056C 0.028 in

0.40 mm²

34* 832-053C 0.034 in 0.59 mm²

48* 832-054C 0.048 in 1.17 mm²

59 832-057C 0.059 in

1.76 mm²

80 832-055C 0.080 in 3.24 mm²

98 832-059C 0.098 in 4.87 mm²

29993* Sizes standard in many fertilizer bundles.

Check your accessories before ordering.

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