6 - Maintenance
76
Pump Valves and Diaphragms Renewal
Pump model: 364 and 464.
1. Lift off the plastic covers (C) with your hands (A) by pulling with the
finger tips while pushing with the thumbs in the centre, as shown
in (B).
Valves
2. Loosen the 4 head bolts (1).
3. Remove the head (2).
4. Change the valves (3) - note their orientation, so that they are
replaced correctly!
μ
ATTENTION! It is recommended to use new gaskets (4), when
changing or checking the valves.
Diaphragms
5. 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 not
blocked.
9. Apply a small amount of pump grease on the underside of the
diaphragms (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 rpm pumps must be secured with locking compound.
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