Great Plains Case Drain & Motor Return Tractor Connection Guide - Manual (Page 4)

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CDMR 08/27/10
Great Plains Manufacturing reserves the right to make changes or to add improvements to this guide at any time without notice or obligation.
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Motor Return
This connection is required to carry the low pressure return oil from the motor to the
hydraulic reservoir or charge circuit. Using a motor return port prevents accidental
reverse operation and possible flow checking of the return SCV coupling. Great Plains
supplies a 3/4” body size ISO 7241-1 Series A male and female coupler with each
YP planter and air drill. The male coupler is installed on the 1/2” or 5/8” motor return
hydraulic hose from the factory. The mating female coupler must be connected to the
tractor motor return port. The motor return hose and couplers are large to reduce back
pressure to the motor.
1-1/16-12
FORB
1.38”
1.06”
1-1/16-12
FORB Great Plains P/N
811-069C
sold through Great Plains as pair only
NOTE: Dimensions are for reference only. Not exact size.
1.125”
Terminology
Agricultural manufacturer’s use different terminology to describe case drain, motor return, power
beyond pressure, and load sense. Below is a list of terms used to describe them:
Case Drain
Zero Pressure Return Low Volume Sump Line
Motor Drain Low Volume Case Drain
Motor Seal Drain Return Direct Outlet Pressure
Low Pressure Drain Return Sump
Low Flow Low Pressure Drain Tank
Free Return
Motor Return
High Flow Low Pressure Return Tank Return
High Volume Hydraulic Motor Return Auxiliary Return
High Volume Low Pressure Return Sump
Power Beyond Return
Below is a list of abbreviations used in this guide to describe types of fittings:
FORB Female O-Ring Boss
FORFS Female O-Ring Face Seal
MORB Male O-Ring Boss
FJIC Female JIC
MJIC Male JIC
DIN Deutsch (German) Industrial Norm
BSPP British Standard Parallel Pipe