Open Center Hydraulics (Optional Equipment) - Hardi Ranger 550 Instruction Book

Open center hydraulics (optional equipment)

The open center hydraulics block is needed if the tractor uses open
center hydraulics and/or if load sensing will be used.
The valve (1) on the side of the block is factory set for open center
hydraulics, but if closed center hydraulics will be used in combination
with load sensing, then screw in the valve.
Certain tractor models are able to use Load Sensing without connecting
an external sensing line. But if optimal sensing control pressure cannot
be obtained, an external sensing line needs to be mounted (3). Please
consult your tractor dealer for correct setup and correct connection.
Before operating the hydraulics, the valve should be adjusted according
to the specific tractor model. If you have doubt about which type of
hydraulic system your tractor is equipped with, please consult your
tractor dealer.
Schedule with combinations of settings for flow element and circuit
value:
Valve no. 1
Open center out
Closed center in
Load sensing (LS) in
*if tractor requires pressure relief then contact your tractor dealer for
further advice.
±
WARNING! Always be sure to fully extract or retract the open/closed center selection valve (1). Failure to do so can
result in damages to vital pump parts.
±
WARNING! It is of essential importance that connectors on sensing line are kept totally clean. Failure to do so can
result in impurities entering the pump and thereby cause damages to vital pump parts.
2 3 (LS port)
out Not conn.
in Not conn.
out* Connected
4 - Sprayer setup
4.5