Hardi MASTER plus HYS

6 - Maintenance
108
Pump Valves and Diaphragms Renewal
Pump model: 364.
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 surface between
diaphragm washer (6) and diaphragm (7).
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 a locking compound.
C
C
1
2
3
3
3
4
4
5
6
7
8