For further information, please contact the RIVA After Sales & Service Department.
| Problem | Cause | Corrective action |
| 1. Air bubbles or foam in the system | The oil level in the tank is too low and does not allow the suction pipe to be completely plunged. In this way the pump sucks oil and air at the same time | Check |
| Possible openings and little holes on the suction pipes or faulty pump seals, which allow air to penetrate | Check | |
| 2. The pump does not deliver oil | Wrong rotation direction | Check |
| Obstructed ducts or suction strainers | Check | |
| Oil level in the tank too low | Check | |
| Air leakages in the suction system | Check | |
| Oil too viscous with some difficulties in passing through | Check | |
| The shaft or other components of the pump are broken | Replace | |
| 3. The pressure of the system is low or fluctuating | The pump does not deliver oil | Check |
| Relief valve is not calibrated | Check | |
| Free discharge of oil to the tank somewhere in the system | Check | |
| 4. The pressure of the system is low or fluctuating | Possible leaks in the piping or elsewhere in pressurized parts of the system | Check |
| Relief valve set at a too low rate | Check | |
| The relief valve remains open or oscillates in its housing | Check | |
| Restriction of pump suction pipes or possible obstruction of filter | Check | |
| Air in leaks in suction pipes or by pump seals | Check | |
| Worn pump | Check | |
| 5. Pump too noisy | Wrong pump rotation direction | Check |
| Oil with air bubbles | Bleed | |
| Oil viscosity causing obstructions to the suction system | Check | |
| Irregular flow of oil into the pump, caused by an insufficient filtering capacity of the filter (the filter could be dirty or not suitable) | Check/Clean | |
| Big lacks of charge along the suction line | Check | |
| Worn pump components | Check/Clean | |
| Relief valve vibrations | Check | |
| Mechanical vibrations due to bad anchor action | Check | |
| 6. Too high temperature | The pump is working at a higher pressure than permitted | Check |
| Faulty or worn pump which causes internal leaks | Check | |
| Excessive blow-by through valves and cylinder | Check | |
| Oil too viscous | Check | |
| Continuous overloaded operation | Check | |
| Temperature too high in the room where the pump unit is placed | Check | |
| 7. Leaks from the seals | Possible abrasive substances have entered into the oil circulation, damaging the pump’s shaft | Check |
| Seals are faulty, broken or mounted in a wrong way | Check | |
| Too hot oil | Check | |
| 8. Pump overcharging the motor | Too viscous oil | Check |
| Obstructed delivery line or excessive resistance | Check |