Grundfos Wastewater Pumps S1.50.80.11.4.50D

Check the oil in the oil chamber

Low oil level may indicate that the upper mechanical shaft seal is defective. Contact an authorised service workshop for further overhaul of the pump and repair, if required

Lack of oil may cause overheating and damage to the mechanical shaft seals

The WIO sensor in the oil chamber trips the alarm if the oil quality or quantity is inadequate, or there is no oil in the oil chamber

Enter the oil quantity based on the range

The oil in the oil chamber can be changed while the pump is in either horizontal or vertical position

However; it is recommended to carry out the oil change while the pump is in a horizontal position

This way, it is easier to drain all the used oil out of the chamber

Warning: This maintenance check requires trained personnel with PPE!

Never work under a pump when it is hanging from a crane

Is the impeller clearance set to 0.7 mm ‡ 0.2 mm?

Is the impeller clearance checked at least 3 different points?

Is the axial clearance 0.7 mm ÷ 0.2 mm?

Is the clearance reset if it is 0.7 mm or more?

Submersible pumps, installation types S, C and ST

Are the six fastening screws of the inlet cover and the three set screws located?

Safety instructions and requirements

DANGER: Pump can tilt. Death or serious personal injury. During maintenance and service, including transport to service workshop, always support the pump by lifting chains or place it in horizontal position to secure stability

DANGER: Electric shock. Death or serious personal injury. Before starting work on the pump, make sure that the main switch is locked in position 0. Make sure that the power supply cannot be switched on unintentionally

WARNING: Crushing hazard. Death or serious personal injury. Make sure that all rotating parts have stopped moving

WARNING: Chemical hazard. Death or serious personal injury. Flush the pump thoroughly with clean water before carrying out maintenance and service. Rinse the pump parts after dismantling

Check oil level and oil condition

Check Cable entries. Make sure the cable entries are waterproof, the cables are not sharply bent or pinched, and the cable sheaths have no visual defects

Warning: Do not disassemble the sensor and do not remove it from the oil chamber

WIO sensor stays in place during the test

Current flowing through the WIO sensor

Seals checked for possible water leak

Use only suitable and manufacturer-approved cables

Cable entries secured to the motor top cover?

Enter the minimum bending radius for the selected power cable

Enter the minimum bending radius for the selected control cable

Sign off on the motor cable maintenance