Cleaning and service
33
Under certain conditions there may be corrosion on metallic parts. This is not a
quality defect and can occur despite best material quality.
Fig.19: Protective oxide layer
The resistance of
“stainless” steel is attributable to an extremely thin invisible
protective oxide layer (
S
), the so-called passive layer.
Since the grinding tool surfaces are exposed to mechanical load, small areas of
corrosion (
K
) may appear after this protective oxide layer has been damaged.
•
This corrosion can be prevented if you dry the grinding tools after rinsing.
In the case of the steel used by Retsch, the protective layer is automatically
continuously formed through a reaction with oxygen (
O
2
).
•
Should areas of rust develop despite this, they can be removed by vigorous
polishing.
Fig. 20: Ring seal
NOTE
•
Check the state of the V-ring seal (
V
) regularly.
–
The bottom edge of the lip seal (
DL
) must be clean and smooth.
•
Replace the V-ring seal when the lip seal is brittle, cracked, frayed or
damaged in order to prevent rust and damage to the cutter bearing.
(V-ring seal part number:
05.111.0243
)
V
DL
Summary of Contents for GM 300
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