Hardi MASTER PRO VHH, Instruction Book, Page: 55 / 82

6 - Maintenance
55
Occasional maintenance
General info
The maintenance and renewal intervals for the following will depend very much on the conditions under which the sprayer
will be operated and are therefore impossible to specify.
Pump valves and diaphragms renewal
Model 363 pump:
Diaphragm pump overhaul kit (valves, seals, diaphragms etc.) can be
ordered. Detect the pump model - kit can be ordered at following
HARDI part No.:
Model 363: part No. 75073700
Valves
Remove valve cover (1) before changing the valves (2) - note their
orientation so they are replaced correctly!
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ATTENTION! A special valve with white flap (2A) is used at the two
upper side inlets. It has to be placed in the valve openings as
shown. All others are the type with black flap. It is recommended
to use new gaskets (3) when changing or checking the valves.
Diaphragms
Remove the diaphragm cover (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 with the following torque setting.
Reassemble pump model 363 with the following torque setting.
Diaphragm cover: 90 Nm / 66.6 lbft
Diaphragm bolt: 90 Nm / 66.6 lbft
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ATTENTION! Before tightening the 4 bolts for the diaphragm cover (B) the diaphragm must be positioned between
centre and top to ensure correct sealing between diaphragm pump housing and diaphragm cover. Turn crank shaft
if necessary.