4 - Sprayer Setup
67
Open and Closed Centre Hydraulics
This hydraulic block is necessary, if the tractor uses open centre
hydraulics and/or load sensing (LS).
The valves (1) and (2) is factory set for open centre hydraulics, but if
closed centre hydraulics is used, screw in valve (1) clockwise. Press valve
(2) in and turn right to lock.
±
WARNING! Always be sure to fully open or close the selection
valves for open/closed centre hydraulics.
Certain tractor models are able to use Load Sensing without connecting
an external sensing line. But if an optimal sensing control pressure
cannot be obtained, an external sensing line needs to be connected to
the tractor.
Connection to Tractor
If Load Sensing (LS) is to be used, connect a hydraulic hose from the
tractor LS port to the O-LS port (D) on this hydraulic block.
Connection size for port D is G1/4”.
The restrictors inside the hydraulic block have different orifices
depending on the oil flow returned to the tractors oil pump.
A. Orifice is ø0.8 mm (default setting).
B. Orifice is ø1.2 mm
C. Orifice is ø1.6 mm
• Check the hydraulic flow by activating a hydraulic lever in the
tractor. If the reaction time for the hydraulic function is relatively
short, continue your work with this restrictor installed.
• If the reaction time seems too long before the hydraulic function is
enabled, switch the plug (E) in port (A) with the plug (F) in port (B)
to allow more oil flow to pass through.
• If the reaction time is still too long, switch the plug (E) in port (B)
with the plug (F) in port (C).
• Always fit the plug (E) in the port used, and fit the other plugs (F)
in the ports not used.
• Ask your HARDI dealer for correct setup if in doubt.
Combinations of settings for the hydraulic block:
*If the tractor requires pressure relief, contact your tractor dealer for further advice.
±
WARNING! It is essential that connectors on the sensing line are kept totally clean, so that impurities do not enter the
pump. Impurities may cause damage to vital pump parts.
Before operating the hydraulics, the valve should be set according to the specific tractor model. If you are unsure of
the type of hydraulic system in your tractor, please contact your tractor dealer.
÷
NOTE! A Load Sensing kit is available for connecting the hydraulic block to the tractor - ask for HARDI item no.
74193800.
Application Valve 1 Valve 2 Port A, B or C
Open centre Out Out No change
Closed centre In In No change
Load sensing (LS) In Out* Change if needed
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