OK our new one has arrived auto command @1700 revs it has a real drone and slight vibration through the floor mat it almost sounds like a hydraulic noise. At pto speed it just seems noisy even when the cooling fan cuts out
You are correct it's expander type and a very poor one. The expander is one end of the four discs. The expander is in two completely separate halves no springs etc keeping it together. So could it just be bad design and not anything wrong with it?