12 AutoFarm GPS AutoSteer
Closed Center Valve Installations Overview
Manual Override Sensor
A pressure transducer is installed on the valve’s TRANS port to provide a manual override (kick-out) electrical signal when
the driver turns the steering wheel while AutoSteering. The pressure transducer measures the pressure present on the LS
OBITROL port. On closed center Load Sense systems, the pressure spike is measured on the Orbitrol’s Load Sense line.
Load Sense
The Load Sense circuit is designed to handle most types of closed center Orbitrol Load Sense systems such as conventional
Load Sense and Dynamic Load Sense. The LS circuit also handles Power Beyond installations.
The LS ORBITROL port is connected by a hose to the LS port on the manual steering unit (Orbitrol) under the steering wheel.
The LS OUT port sends out a LS signal to stroke the pump and is connected by a hose to the LS port on the steering priority
valve or LS port on the tractor’s power beyond system. The LS circuit allows LS oil flow across the valve in both directions as
long as a plug is not installed in position 13B. A plug in position 13A can be replaced by an orifice when the vehicle’s LS
circuit requires a bleed-down to tank to de-stroke the pump when AutoSteer is not turning the wheels.
Plugs and Orifices
The valve is supplied with one extra blind plug and two extra orifices with a diameter of 0.022” and 0.031.” These extra
orifices enable several different configurations of the Load Sense circuit to handle the various kinds of Load Sense
installations commonly found on tractors and farm machinery. Refer to the configuration tables in this manual to determine the
correct orifice and plug configuration according to the type of steering system and hookup.
Closed Center Valve Installations Overview
Closed Center Load Sense Installation
The AutoFarm pressure and tank hoses are teed into the Orbitrol pressure and tank lines and share the same oil supply that can
come from either a variable displacement pump or a fixed displacement pump with a priority valve. The Orbitrol’s LS hose is
looped through the AutoFarm valve so that the Orbitrol and AutoFarm valve share the same LS circuit. The LS circuit inside
the AutoFarm valve will handle oil flow in either direction and will therefore work with either static LS or dynamic LS
systems.
An LS relief valve inside the AutoFarm valve limits the maximum LS pressure and therefore limits the maximum pump
pressure. A pressure sensor connected to the LS hose that goes to the Orbitrol detects a pressure spike when the steering wheel
is turned and kicks-out AutoSteer. The AutoFarm right and left steering hoses are teed into the machines steering lines and
sends oil directly to the steering cylinders. The non reactive Orbitrol keeps the steering wheel stationary while AutoSteering.
In this type of installation a plug must be installed inside the AutoFarm valve to isolate the power beyond LS signal from the
Orbitrol’s LS signal.
Closed Center Power Beyond Installation
The AutoFarm pressure, tank and LS hoses are connected to the tractor power beyond system which is independent of the
tractor steering system. A LS relief valve inside the AutoFarm valve limits the maximum LS pressure and therefore limits the
maximum pump pressure for AutoSteering. A second LS hose is teed into the Orbitrol’s LS hose for detecting a pressure spike
when the driver turns the steering wheel. The transducer signal is used to kick-out AutoSteer when the driver turns the steering
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