Jesco MAGDOS LK Operating Instructions Manual

MaintenanceTighten up dosing head bolts42 © Lutz-Jesco GmbH 2015BA-10221-02-V03Stepper Motor-driven Diaphragm Dosing Pump MAGDOS LK Operating InstructionsMaintenance work to be carriedoutFrequencyReplace parts that are subject towear (diaphragms, valves, seals,etc.)if you detect unacceptable wearRinse out and clean the dosingpumpn before changing diaphragmsn before decommissioning fora long period of timen after feeding aggressive,adhesive, crystallising orcontaminated liquidsTab. 39: Maintenance information and maintenance intervals12.2 Tighten up dosing head boltsè Tighten the dosing head bolts in diagonally opposite sequence with atorque wrench.The necessary torque is 180 Ncm.12.3 Change the diaphragmdecbaFig. 51: Exploded view of the diaphragm and dosing head12.3.1 Dismount the old diaphragmPrecondition for action:ü You have disconnected the dosing pump from the mains supply.ü You have depressurised the hydraulic sections of the plant.ü You have rinsed the dosing pump using a safe medium (e.g. water).Perform the following working steps:1. Screw out the four screws e on the dosing head using a suitabletool (SW 3 Allen key) and take off the dosing head d.2. Use pliers to bend the edge of the diaphragm c slightly upwardsand screw it out counter-clockwise.12.3.2 Install a new diaphragmPrecondition for action:ü You have thoroughly cleaned the diaphragm rod b and thediaphragm flange a so that the new diaphragm is not affected bydosing medium residues.ü You have slightly greased the diaphragm thread c (e.g. usingMolykote Longterm W2).1. Screw the diaphragm manually c in the clockwise direction until itsafely contacts into the diaphragm rod.2. Bring the dosing head into position and insert the screws. Firsttighten the screws finger-tight. After this, tighten the screws in diago-nally opposite sequence, e.g. top left and bottom right and top tightand bottom left.NOTICEDamage to the dosing head/leakiness of the diaphragmIf you tighten the screws too much, this can lead to the dosing headbeing damaged. However, not tightening the screws enough leads tothe diaphragm being leaky and correct functioning being affected.ð Tighten the screws to a torque of 180 Ncm.ü Diaphragm change finished.i It may be necessary to recalibrate the dosing pump afterreplacing the diaphragm or other spare parts on it. For moreinformation, refer to page 35.12.4 Clean suction and discharge valvesContaminated valves affect the dosing preceision and this means thatyou should clean the valves on a regular basis.With dosing heads made of plastic, when replacing a valve you mustreplace the complete dosing head (see “Spare parts“ on page 44).