Never spin the pump backwards.
Never remove the stub shafts from the rotor. The rotor has been machined as a complete unit
for exact balance. Removing the stub shafts will destroy the factory-set clearances and balance.
No maintenance should be undertaken, or parts be removed if there is either pressure or
vacuum in the tank.
Troubleshooting
The Pump Overheats
Potential causes to check and resolve:
Inadequate level of oil, or no oil in the pump.
RPM in excess of recommended levels.
Continued operation above recommended maximum vacuum and pressure levels.
Blocked Inlet Filter.
Pump is covered in mud and/or dirt.
Plumbing diameter is of an insufficient size.
Blockage in exhaust.
The Rotor does not Rotate
Potential causes to check and resolve:
Damaged vane(s).
Damaged bearing(s).
Issue with the drive system.
Ice frozen inside the pump.
The Pumps Performance is Impaired
Potential causes to check and resolve:
Four-way valve is in the neutral position.
Worn vanes.
Worn shaft seals.
Leaks in the tank or pipework.
Plumbing diameter is of an insufficient size.
Non-return valve is blocked and does not open fully.
Blocked Inlet Filter.
RPM rate below recommended level.
Collapsed hose in the system setup.