Xylem Flygt 2620.172, Service And Repair Instructions

Page: 3 / 72

Table of Contents
1 Introduction and Safety..............................................................................................................3
1.1 Introduction.......................................................................................................................... 3
1.2 Safety terminology and symbols........................................................................................3
1.3 User safety.............................................................................................................................4
1.4 Special hazards.....................................................................................................................4
1.4.1 Working in temporary installations.............................................................................4
1.4.2 Biological hazards.........................................................................................................4
1.4.3 Wash the skin and eyes................................................................................................ 5
1.5 Protecting the environment................................................................................................5
1.6 End of life product disposal................................................................................................5
1.7 Spare parts............................................................................................................................6
1.8 Warranty................................................................................................................................6
2 Product Description....................................................................................................................7
2.1 Products included................................................................................................................ 7
2.2 Pump design.........................................................................................................................7
2.3 Monitoring equipment........................................................................................................ 8
2.3.1 Level regulators.............................................................................................................8
2.4 The data plate.......................................................................................................................8
2.5 Product denomination........................................................................................................ 9
3 Installation................................................................................................................................. 11
3.1 Hazardous atmospheres................................................................................................... 11
3.2 Make the electrical connections...................................................................................... 11
3.2.1 General precautions...................................................................................................11
3.2.2 Grounding (earthing) ................................................................................................ 12
3.2.3 Product-specific precautions.....................................................................................13
3.2.4 Prepare the SUBCAB
™ cables................................................................................... 13
3.2.5 Connect the motor cable to the pump.................................................................... 14
3.2.6 Cable charts.................................................................................................................15
3.3 Check the impeller rotation..............................................................................................19
4 Maintenance..............................................................................................................................20
4.1 Precautions......................................................................................................................... 20
4.2 The fault-tracing process.................................................................................................. 21
4.2.1 Trace faults in the drive..............................................................................................21
4.2.2 Check the stator.......................................................................................................... 21
4.2.3 Trace faults in the wet end.........................................................................................22
4.3 Torque values.....................................................................................................................22
4.4 Change the oil....................................................................................................................23
4.5 Disassemble the pump..................................................................................................... 25
4.5.1 Disassembly overview................................................................................................25
4.5.2 Remove the discharge connection: Drainage version only.................................. 26
4.5.3 Remove the cover: Sludge version only.................................................................. 26
4.5.4 Remove the impeller: Drainage version.................................................................. 27
4.5.5 Remove the impeller: Sludge version......................................................................29
4.5.6 Remove the mechanical seal.....................................................................................30
4.5.7 Remove the shaft unit.................................................................................................31
4.5.8 Remove the bearings................................................................................................. 33
4.5.9 Remove the pump top: Standard version only....................................................... 34
4.5.10 Remove the stator.................................................................................................... 39
Table of Contents
2620.172/.281 Service and Repair Instructions 1