Hardi MEGA VPZ NK, Original Instruction Book

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