How do I remove the transport bolts before using my washing machine?
You must completely remove all 4 transport bolts before first use by loosening and pulling them out along with their sleeves. After removal, place the four provided plastic covers over the transport bolt holes by pressing firmly on the snap hook to lock them in place. Failure to remove the transport bolts can damage the drum, cause excessive vibration, and create noise during spin cycles. Keep the bolt assemblies stored for future use when moving the washer. (Page 14)
From the official Bosch WAT28400UC Front-Load Washing Machine manual, page 14
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