98
6 - Maintenance
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!
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 r.p.m. pumps must be
secured with locking compound.
ATTENTION! Before tightening the 4 bolts for the head (2), the
diaphragm must be positioned between centre and top to
ensure correct sealing between diaphragm pump housing and
diaphragm cover. Turn the crank shaft if necessary.
Re-lubrication after assembly
After disassembling the pump (diaphragm renewal, etc.) the pump
MUST be lubricated with 200 g grease into each lubrication point.
Hardi pump grease cartridge (400g): Item no. 28164600
Overhaul Kit
Pump model: 364 and 464.
Diaphragm pump overhaul kit (valves, seals, diaphragms etc.) can be
ordered. Detect the pump model - the overhaul kit can be ordered by
your local dealer.
Model 364: Item no. 75585900. Model 464: Item no. 75586000.
C
1
3
3
2
4
C
8
4
3
7
6
5
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