14 - TROUBLESHOOTING423
Problem Cause Corrective action
4. The pressure of the system is low or uctuating • Possible leaks in the piping or elsewhere in
pressurized parts of the system
• Relief valve set at a too low rate
• The relief valve remains open or oscillates in
its housing
• Restriction of pump suction pipes or possible
obstruction of lter
• Air in leaks in suction pipes or by pump seals
• Worn pump
• Check
• Check
• Check
• Check
• Check
• Check
5. Too noisy pump • Wrong pump rotation direction
• Oil with air bubbles
• Oil viscosity causing obstructions to the suc-
tion system
• Irregular inow of oil to the pump, caused by
an insufcient ltering capacity of the lter (the
lter could be dirty or not suitable)
• Big lacks of charge along the suction line
• Worn pump components
• Relief valve vibrations
• Mechanical vibrations due to a bad anchor action
• Check
• Bleed
• Check
• Check/Clean
• Check
• Check/Replace
• Check
• Check
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