6 - Maintenance
91
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 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 connecting rod washer).
10. Reassemble the pump with the following torque setting:
• Diaphragm head bolts (1): 67 Ft/lb (90 Nm)
• Diaphragm bolt (5): 67 Ft/lb (90 Nm)
• Refit the plastic covers (C).
÷
NOTE! The diaphragm bolt on 1000 r.p.m. pumps must be
secured with a locking compound such as Loctite® 262
(HARDI® Part No.: 28045503).
ATTENTION! Before tightening the 4 bolts for the head (2), the
diaphragm must be positioned between the center and top to
ensure correct sealing between the diaphragm pump housing
and diaphragm cover. Turn the crank shaft if necessary.
Re-lubrication after assembly
After disassembling the pump (diaphragm replacement, etc.), the pump
MUST be lubricated with 7 oz. (200 grams) grease into each lubrication
point.
ATTENTION! In order to avoid excessive wear, it is important to
use a recommended lubricant (i.e. HARDI® part no. 28164600).
See “Recommended lubricants” on page 81.
C
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