6 - Maintenance
71
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 63.
Model 463 pump valves and diaphragms replacement
Diaphragm pump overhaul kit (valves, seals, diaphragms etc.) can be
ordered. Detect the pump model - kit can be ordered using correct
HARDI® part No.:
Model 463: part No. 75073900
Valves
Remove valve cover (1) before changing the valves (2) - note their
orientation so they are replaced correctly!
AT TENTION! 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 463 with the following torque setting.
Diaphragm cover: 67 Ft/lb (90 Nm)
Diaphragm bolt: 67 Ft/lb (90 Nm)
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.
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