BERNT LORENTZ GmbH & Co. KG
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel (+49) 0 4193 8806-700, Fax -708, www.lorentz.de
Troubleshooting guide for LORENTZ ECDRIVE submersible
All specifications and information are given with good intent, errors are possible and products may be subject to change without notice.
Pictures may differ from actual products depending on local market requirements and regulations.
3 Inner observations
The repair guide shows you how to dis- and reassemble the defective ECDRIVE properly. During the
disassembly some indicators help you find the cause of the failed ECDRIVE. These indicators are listed
below.
3.1 Investigate the water inside the motor
By removing the diaphragm, water will be visible on the
bottom of the motor. If there is no or even little water as
shown on the picture, the motor got overheated. Please
check the root cause for overheating in chapter “4 Root
cause for damages” on page 15.
Afterwards, remove the water inside the motor by filling it
into a clean bucket. This water needs to be investigated.
Do not reuse this water.
If the water is not clear, either the motor was overheated
and emitted particles or the water in the well contained
particles which got into the motor. Please check the root
cause for overheating in chapter “4 Root cause for damages” on page 15.
3.2 Rear cover filled with mud
Sometimes, mud enters through the balance holes into the rear
cover. This will clog the space between the rear cover and the
diaphragm. If the water heats up, there is no opportunity to expand
and the water will leak out at the top (through the shaft seal).
If there is mud in the rear cover, it is probable that the pump has
been installed in great depth (pump sitting on the bottom of the
well) or, for example, the pump has been installed in a lake without
a floating body. The motor will overheat, meaning that the upper
bearing can be jammed. Proceed with the further investigation to
check whether a repair makes sense. The mud in the rear cover has an influence on other parts, but
it will not stop the motor.
If the rear cover is fully intact and not further damaged, clean it thoroughly before reuse.
Open the ECDRIVE only if you are 100% sure that the ECDRIVE is defective.
Perform all steps of the outer investigation (chapter 2.1
) before opening the
ECDRIVE! It is mandatory to use proper tools for disassembly and reassembly!
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