Common faults and treatments for Rotary Lobe Pump are listed below:

Pump does not restart properly

- Solids settle in the pump body after the pump is out of service: the pump needs to be cleaned.

- Rotor expansion, stuck pump casing: check the temperature and composition of the material, select and replace the appropriate rotor.

- Long fiber metal or plastic pieces of foreign matter stuck in the pump: clean the pump, inlet installation of cutting and crushing machinery.

- Rotor axial tolerance is not suitable: adjust the axial tolerance.

- Insufficient motor power: Replace the motor.

The pump is not self-priming

The pump can not self-priming - inlet and outlet valves are not open: open the inlet and outlet valves.

- Self-priming height is too high: Reduce the self-priming height and fill the pump.

- Seal failure: Replace the seal.

- Wrong flow direction: Change the direction of rotation.

- Clogged inlet pipe: Clean inlet pipe.

- Inlet leakage and air intake: Check gasket or inlet tightness.

- Air bubbles in pump or piping: fill with fluid or remove air.

- Rotor rubber layer broken: replace the rotor, check the temperature and composition of the material, select and replace the suitable rotor.

Pump Vibration

- Speed too high, pump void not filled: reduce speed or increase inlet pressure.

- Worn rotor: replace rotor.

- Damaged bearings: replace bearings.

- Clogged inlet pipe: Clean inlet pipe. Inlet pipe clogged: clean inlet pipe,

Leakage from the top of the intermediate isolation chamber

- Mechanical seal O-ring damage: replace the O-ring.

- Mechanical seal failure: replace the mechanical seal.

Insufficient flow or head

- Excessive inlet resistance: check the inlet pipe and clear the blockage.

- Insufficient pump speed: adjust the pump speed.

- Clogging inside the impeller or piping: Clear the clogging inside the impeller and piping.

Excessive Noise

- Bearing wear: replace the bearing.

- Impeller unbalanced or too tight: adjust the balance and tightness of the impeller.

- Installation is not firm: re-install the pump body.

Poor sealing performance

- Deteriorated, loose or worn seals: Check the condition of the seals and adjust or replace them.

- Leakage between the pump body and piping: check the connection area and replace gaskets and other sealing materials.

motor failure

- Bad motor wiring: Check wiring and reconnect.

- Worn motor bearings: replace motor bearings.