11.0Disassembly and Assembly AS-series
11.1General instructions
Assembly and disassembly may be preformed by qualified personnel only. Always wear appropriate safety clothing. Make sure that personnel are instructed and educated.
Insufficient or wrong assembly and disassembly can lead to the pump malfunction. Johnson Pump is not liable for accidents and/or damage caused by
Always work in a clean surrounding. Keep all highly sensitive parts such as seals, O- rings, bearings, etc. in their original packing as long as possible.
Use a clean work surface.
Check that the parts to be used have not been damaged during transport.
Never work on the pump in operation. In case of a disassembled pump, avoid any contact with the impeller when turning the shaft manually.
Do not forget that the pump can be started even when the pump casing has been remo- ved for e.g. cleaning. Never run the pump without the pump casing. Follow the instructions for shutdown before performing any maintenance or service.
After disassembly carefully clean the parts and check them for damage, especially the mounting surfaces, and replace all damaged parts.
All parts fitted together at the disassembly must stay together when reinstalled, especially the impeller, shaft, shim and back plate.
11.2O-rings and lip seals
When working with lip seals or
All
For
11.3Shutdown
Before starting the maintenance or inspection, follow the next steps to shut down the pump.
1.Stop the pump. To prevent the motor from starting while you are working on the pump follow the procedure below:
•Turn off the pump at the electrical cabinet.
•Set the pump circuit breaker to off.
•Switch off and lock the operating switch.
•Remove the fuse.
•Sign the electrical cabinet “danger”.
2.Remove, if necessary, the protection around the shaft coupling when the pump has stopped completely.
3.Let the pump cool down to ambient temperature.
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