Assemble open-center valve – Great Plains V300 Assembly Instructions User Manual

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Great Plains Mfg., Inc.

Installation Instructions

11/08/2006

148-771M

Assemble Open-Center Valve

This section is for the 148-766A Open-Center (OC) kit. If
you have the 148-765A Closed-Center kit, see page 4.

Callout numbers are assigned from the “Kit Parts List”
on page 24.

Torque fittings and fasteners per “Torque Values” on
page 23.

A cluster of arrows in each diagram shows directions (T)
Top, (B) Bottom, (L) Left, (R) Right, (F) Front and (R)
Rear.

Assemble OC Down Pressure Control Valve
and Shuttle Valve

Refer to Figure 6

44. Select the (44) 810-301C,

(VALVE PRESS REDUCING W/CHECK).
Orient it so that the control knob is on the Front,
toward the Bottom.

45. Select a (58) 811-216C,

(EL 3/4MJIC 9/16MORB).
Screw the male O-ring boss end into the Top Front
port of valve body (44). Adjust the JIC end to face
Left and tighten jam nut.

46. Select a (64) 811-675C,

(PL 9/16MORB HEX HEAD).
Screw the plug into the Top Rear port of valve body
(44) and tighten.

47. Select a (63) 811-636C,

(AD 9/16MORB STRAIGHT UNION).
Screw the male O-ring boss end into the Rear port
of valve body (44) Do not fully tighten at this time.

48. Select a (52) 811-064C,

(TE 9/16MJIC 9/16MJIC 9/16MORB).
Screw the male O-ring boss end into the Bottom
port of valve body (44). Adjust the tee so the center
port faces Left and tighten jam nut.

49. Select a (66) 841-077C,

(EL 3/4FJIC 3/4MORB).
Screw the female JIC end onto fitting (58). Adjust
angle so that the ell points to the Rear, and tighten.

50. Select the (49) 810-554C,

(FILTER INLINE 3/4FORB 3/4MJIC).
Screw it onto fitting (66) and tighten.

51. Select the (45) 810-343C,

(VALVE PO CHECK 2:1 W/9/16FORB).

Note: The ports of valve (45) are stamped with num-

bers “1”, “2” and “3”. Orient the check valve so
that port

➁

is to the Front, port

➀

to the Rear and