Retsch BB 300 - Manual (Page 15)

07/02/2012 Retsch GmbH 15
Do not set the gap width of the BB 300 to below 1 mm.
Mechanical components can be damaged if there is blockage.
Feeding in process material
Fig.6
The feed hopper B can accept process material with grain sizes up to
130 mm. Only fill the feed hopper and the crusher chamber when the
machine is running.
The feed hopper is not however intended for storage of process
material: its function is solely that of feeding material into the crusher
chamber. It also prevents inadvertent reaching into the crusher
chamber, and stops process material from being ejected.
Fig.6
If the crusher chamber W is filled more than 2/3 (3500ml), the guide
plates on the feed hopper can be damaged and process material
conveyed by the moving crusher arm into the crusher casing behind
the crusher arm.