6 - Maintenance95364/464 Pump Valves and Diaphragms Renewal1. Lift off the plastic covers (C) with your hands (A) by pulling withthe finger tips while pushing with the thumbs in the centre, asshown in (B).Valves2. Loosen the 4 head bolts (1).3. Remove the head (2).4. Change the valves (3) - note their orientation, so that they arereplaced correctly!μ ATTENTION! It is recommended to use new gaskets (4), whenchanging or checking the valves.Diaphragms5. Loosen the diaphragm bolt (5).6. Remove the diaphragm washer (6).7. The diaphragm (7) may then be changed.8. Check that the drain hole (8) at the bottom of the pump is notblocked.9. Apply a small amount of pump grease on the underside of thediaphragms (between diaphragm and conrod washer).10. Reassemble the pump with the following torque setting.• Diaphragm head bolts (1): 90 Nm.• Diaphragm bolt (5): 90 Nm.11. Refit the plastic covers (C).÷ NOTE! The diaphragm bolt on 1000 r.p.m. pumps must besecured with locking compound.μ ATTENTION! Before tightening the 4 bolts for the head (2), thediaphragm must be positioned between centre and top toensure correct sealing between diaphragm pump housingand diaphragm cover. Turn the crank shaft if necessary.CC123334 45678
