6 - Maintenance
6.7
ATTENTION! A special valve with white flap (2A) is used at the
two upperside inlets. It has to be placed in the valve open-
ings as shown. All others are the type with black flap. It is rec-
ommended to use new gaskets (3) when changing or check-
ing the valves.
ATTENTION! Before tightening the 4 bolts for the diaphragm cover (B) the diaphragm must be positioned between
center and top to ensure correct sealing between diaphragm pump housing and diaphragm cover. Turn crank
shaft if necessary.
The maintenance and replacement intervals for the following will depend very much on the conditions under which the
sprayer will be operated and are therefore impossible to specify.
Diaphragms
Remove the diaphragm bolt (4). The diaphragm (5) may then be
changed. If fluids have reached the crankcase, re-grease the pump
thoroughly. Also check that the drain hole at the bottom of the
pump is not blocked.
Reassemble pump model 363/463 with the following torque setting.
463 Diaphragm cover: 65 Ft/lb (90 Nm)
463 Diaphragm bolt: 60 Ft/lb (80 Nm)
363 Diaphragm cover: 50 Ft/lb (70 Nm)
363 Diaphragm bolt: 45 Ft/lb (60 Nm)
Model 363 and 463 pumps:
Diaphragm pump overhaul kit (valves, seals, diaphragms etc.) can be
ordered. Detect whether the pump is a 363 or a 463 model - kit can
be ordered at following HARDI® part No.:
Model 363: part No. 750342
Model 463: part No. 750343
Valves
Remove valve cover (1). Before changing the valves (2) - note their
orientation so they are replaced correctly!
Pump valves and diaphragms replacement
General info
Occasional maintenance
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