Hardi MEGA VPZ NK Original Instruction Book page 157

FAULT
Pump
Liquid leaks from the bottom of the pump.
Grease leaks from the bottom of the pump.
Grease leaks from the shaft grease seals.
Lack of pressure.
Vibrations in system and unpleasant noise from the
pump.
Lack of flow / capacity.
Extreme internal erosion on diaphragm covers and
housing.
Short lifetime for diaphragm.
PROBABLE CAUSE
Damaged diaphragm.
Grease used has too low viscosity.
Grease used has too low viscosity.
Bearings worn/too high friction.
Pump valves are blocked or defect.
Plugged filters in fluid system.
Pump valves are blocked or defect.
Air is being sucked into system.
Internal wear on conrod and conrod ring.
Pump valves are blocked or defect.
Too high vacuum caused by clogged suction filter or
excessive pump speed (rpm).
Lack of internal cleaning.
Lack of conservation of the fluid system during
storage.
Overspeeding of the pump.
7 - Fault Finding
CONTROL / REMEDY
Replace diaphragm.
Change to recommended grease type.
Change to recommended grease type.
Replace pump bearings and grease seals.
Check for obstructions or, if needed, replace valves.
Clean filters.
Check for obstructions or, if needed, replace valves.
Check for leaks, pinholes in suction hoses, tightness
/ gaskets / O-rings of all fittings on the suction side.
Poor greasing. Replace parts as needed and observe
proper grease quality and intervals.
Check for obstructions or, if needed, replace valves.
Replace affected pump parts.
Clean suction filter and observe maximum pump
speed (rpm).
Use recommended cleaning procedures and add
extra cleaning agents (e.g. AllClearExtra or similar).
Always use a proper mixture of antifreeze during
storage.
Observe maximum pump speed (rpm).
157