6 - Maintenance
63
Occasional maintenance
General information
The maintenance/replacement intervals for the following parts depend greatly on the conditions of use to which the
sprayer is subjected and it is therefore not possible to be precise.
Replacing pump valves and diaphragms
Pump model 363:
Repair sets for diaphragm pumps are available (valves, gaskets,
diaphragms, etc.). Check the pump model - the reference for the
HARDI EVRARD set is:
Model 363: part no. 75073700
Valves
Remove cover (1) to replace valves (2) - note their orientation for
re-fitting them correctly.
IMPORTANT! A special valve with a white mechanism (2A) must
be fitted to the two upper intakes. Position them as illustrated.
All the other valves have a black mechanism. It is recommended
that new gaskets (3) are used for re-assembly.
Diaphragms
Remove bolt (4). Diaphragm (5) is now accessible. If the crankshaft
housing is wet, dry it and then grease the pump well. Also check that the
drain hole under the pump is not blocked. Re-fit the parts, applying the
tightening torques below.
Tightening torques for 363 pumps :
Diaphragm bolt (4): 90 Nm/66.6 lb/ft
Diaphragm cover bolts: 90 Nm/66.6 lb/ft
IMPORTANT! Before tightening the four bolts in the diaphragm cover (B), position the diaphragm between the middle
and the top in order to get a perfect seal between the pump housing and the diaphragm cover. Turn the crankshaft
if necessary.
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