Thank you for the sound sample.
Of course I may be wrong, but:
- The behaviour “occuring while applying more load” - does match exactly to the rear joint issue.
- The sound matches, too.
Your last sentence seems very complex therefore I’d like to split my reply into several single parts:
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Yes, it may happen that even younger than two year old EVO drives must be replaced.
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The costs will depend mainly from the workstore’s professionality but also their abilities.
(Please note that there are a few special tools required to separate drive and frame, also to remove the beltwheel from the drive.) -
The costs for a single KS3 drive will be around 250 € (it is in stock for example in Germany, confirmed).
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If all required tools (including electric or pneumatic impact screw driver) are on hand and the mechanic familiar with the process a drive change must not take longer than one hour.