Hardi MARRO TWIN FORCE 1000 Instruction Book

55GB 16 04FAULTNo boom movementswhen activatedBoom lift raises to max.pos. when tractorhydraulics are engagedOil heats up in ClosedCentre systemsIndividual ram does notmovePROBABLE CAUSEnsufficient oil pressureInsufficient oil supply.Blown fuse.Bad / corroded electricalconnectionsInsufficient power supply.Defect relay / diodes in junctionbox.Clogged restrictors B or C inby-pass block.Wrong polarity.Wrong oil inlet to by-passblock.Back pressure in return lineexceeds 20 barBy-pass valve 0 does not closeproperlyInternal leaks in flow regulatorClogged restrictorCONTROL/REMEDYCheck oil pressure - min. 130 bar, max. 160bar.Check tractor hydraulic oil levelOil flow must be min. 10 l/min. and max. 90 l/min.Check tractor hydraulic oil level.Check / replace fuse in junction box.Check / clean connections, multi plugs etc.Voltage on activated solenoid valve must bemore than 8 Volts. Use wires of at least 4 mm 2for power supply.Check relays, diodes and soldering at PCB injunction boxRemove and clean restrictors B and C in by-pass block (See hydraulic diagram) Changehydraulic oil + filterCheck polarity. White pos. (+) Blue neg. (-).Connect hydraulic snap couplers opposite intractor outlets, or engage spool valve lever inopposite directionConnect the return line with free flow to hydrau-lic oil reservoir.Divide return line in two and lead return oilback to reservoir via two spool valves.Check / replace locking clip on by-pass valve 0.Replace flow regulator O-rings and back-uprings. Replace flow regulator.Dismantle and clean restrictorDDDDD.A.H. Hy.A.H. Hy.A.H. Hy.A.H. Hy.A.H. Hydrdrdrdrdraulic syaulic syaulic syaulic syaulic systemstemstemstemstem