ARAG 871 Series User Manual (English)

Questions and Answers:

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Christian WilsonAug 12, 2025
Why working pressure cannot be achieved by ARAG Control Unit?
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  Tammy OneillAug 12, 2025
  If the working pressure cannot be achieved, it may be due to several reasons: * The main valve motor might be malfunctioning; in this case, check the electric connection. * The inlet and outlet tubes might not be connected correctly; check their connections. * The maximum pressure valve could be fully loosened; adjust it. * The self-cleaning filter drain might be fully open; tighten its knob. * The delivery or suction filter might be clogged; clean the respective filter cartridge. * There might be insufficient liquid delivery to the control unit; check the pump rate, increase pump RPM, or check for open branches or drain outlets upstream of the control unit. * The proportional valve may be fully open; operate the pressure control switch to close it.
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Audrey Steele MDAug 16, 2025
What to do if pressure gauge reading higher than actual pressure in ARAG 871 Control Unit?
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  webbrachelAug 16, 2025
  If the pressure gauge reading is higher than the actual pressure, it could be due to: * A malfunctioning pressure gauge; in this case, change the pressure gauge. * A squashed gasket inside the pressure gauge partially obstructing the passage; slightly loosen the pressure gauge. * Undersized passages across the valve and nozzle, leading to a significant pressure drop; choose section valve tubes and hose tails of the correct size.
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hallenAug 20, 2025
What to do if pressure cannot be reduced by ARAG Control Unit?
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  Tracey HarrisonAug 20, 2025
  If the pressure cannot be reduced, it may be because: * The proportional valve motor is not working; check the electric connection. * The proportional valve drain passage is clogged; clean the drain passage. * A hydraulic agitator is connected to the drain passage of the proportional valve; remove the hydraulic agitator and leave the hole open. * The drain tube of the proportional valve is undersized; change the drain tube. * The proportional valve flow rate is lower than the desired rate setting; change the proportional valve.
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Dr. Melanie LopezAug 25, 2025
What to do if liquid coming out of section valves when main valve is closed in ARAG Control Unit?
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  Steven TorresAug 25, 2025
  If liquid is coming out of the section valves when the main valve is closed, it could be due to: * An obstructed drain passage of the main valve; clean the drain passage. * A hydraulic agitator connected to the drain passage of the proportional valve; remove the hydraulic agitator and leave the hole open. * An undersized drain tube of the proportional valve; change the drain tube. * Chemical residue on gaskets and the seat of the main valve hose tail; clean the parts with a suitable detergent.
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Anthony NielsenAug 27, 2025
Why adjustment inaccurate in ARAG 871?
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  Mr. Nathan ArnoldAug 27, 2025
  If the adjustment is inaccurate, with minor movements of the switch leading to significant changes in pressure, it could be because: * The proportional valve is not correctly sized for the system; change the proportional valve. * There is insufficient liquid delivery to the control unit; check the pump rate, increase pump RPM, or check for open branches or drain outlets upstream of the control unit.
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carla70Aug 31, 2025
What causes large amount of pressure fluctuation when one or two sections are closed in ARAG Control Unit?
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  Kayla CohenAug 31, 2025
  A large amount of pressure fluctuation when one or two sections are closed may be caused by unadjusted metered by-passes. To solve this, adjust the metered by-passes.
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William TaylorSep 3, 2025
What to do if pressure sensor reading higher than actual pressure in ARAG Control Unit?
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  kellyguerreroSep 3, 2025
  If the pressure sensor reading is higher than the actual pressure, it could be because: * The sensor is malfunctioning; change the data settings in the computer, and if the problem persists, change the sensor. * The passages across the valve and nozzle are undersized, leading to a significant pressure drop; choose section valve tubes and hose tails of the correct size.
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jheathSep 7, 2025
Why one or more sections not closing correctly in ARAG Control Unit?
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  Susan MarshSep 7, 2025
  If one or more sections are not closing correctly, it could be due to: * The section valve motor not working; check the electric connection. * The section valve plug gasket being worn out; change worn gaskets. * Chemical residue on the gasket and seat of the section valve hose tail; clean the parts with a suitable detergent.