Great Plains Power Beyond - Manual (Page 3)

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PB 01/03/11
Great Plains Manufacturing reserves the right to make changes or to add improvements to this guide at any time without notice or obligation.
Explanation
The purpose of this guide is to show the port locations for connecting Great Plains 3PYP
planter fan motor to case drain & motor return and steering hydraulics to tractor power beyond
hydraulic connections. The information obtained for this guide was taken directly from the
tractor manufacturer’s information that is available on-line and through tractor dealers.
Since tractor equipment and options vary, the connections shown in
this guide must be verified through the tractor manufacturer or dealer
to prevent damage to the tractor and implement hydraulic systems.
Great Plains continuous flow fan motors require case drain and motor return lines to protect
the motor during use. The case drain line must be connected first, then connect motor return
line before connecting the fan pressure line. Failure to do so can cause damage to the motor
seals. When disconnecting, always disconnect fan pressure, then motor return, and case
drain last.
ALWAYS Connect ALWAYS Disconnect
Case Drain First Fan Pressure First
Motor Return Second Motor Return Second
Fan Pressure Last Case Drain Last
Power beyond pressure and load sense connections are also required for Great Plains 3PYP
planters equipped with hydraulic steering. The power beyond pressure connection supplies
flow when required for the steering circuit. The load sense line determines when and how
much flow is required for the steering circuit. When no flow is required, (i.e. when driving
straight or above speed of 8 mph), the system goes into low pressure stand-by mode to
reduce hydraulic heating and lessen tractor horsepower draw.
The tractor must be turned off
before making these connections.
Case Drain
This connection is required to carry the fan motor case internal leakage and steering
pilot return flow directly to the tractor hydraulic reservoir (sump) with zero pressure.
The case drain oil serves to lubricate and cool motor components not directly exposed
to the working oil. Great Plains supplies a 3/8” body size ISO 16028 zero pressure flat
face case drain male coupler on a 1/4” hydraulic hose for the fan/steering case drain
line. It is normal to have seepage from this fitting when disconnected from the tractor to
protect the motor seals from thermal expansion. If the tractor is not equipped with a
female flat face case drain coupler, then it must be sourced through a tractor dealer or
hydraulic supplier.
0.72”
0.26”
3/4-16
FORB
0.777” 0.5”
Great Plains
P/N 841-099C
NOTE: Dimensions are for reference only. Not exact size.
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