Just looked at the box - mine is the Chef Premier, 1000W motor and the bowl has a 4.6l capacity - not sure if that is to the brim - obviously wouldn't do that, but as a guide in the enclosed documentation:
(Item, Chef, Major)
Code:
Shortcrust pastry 680g flour 910g
Stiff yeast dough 1.36Kg flour 1.5Kg
Total weight 2.18Kg 2.4Kg
Soft yeast dough 1.3Kg 2.6Kg
Total weight 2.5Kg 5.0Kg
Fruit cake mix 2.72Kg 4.55Kg (Total weight)
Egg whites 12 16
The Chef range has product number in the KM300 - KM800 range
The Major has product numbers in the KM001 - KM007 range
If you are nursing your existing Chef, you might find this site useful
http://kenwoodchefrestore.co.uk