a) Changing of outer sleeve, due to: interior pollution of cooling channels | non-repairable damages | improved properties → hard face sleeve, improved cooling efficiency

b) Dis-assembling and (mechanical) cleaning due to heavily pollution of interior cooling channels

c) Flushing (chemical cleaning) due to pollution of interior cooling channels

d) New coating due to abrasion, ozone, chlorides etc.

e) Journal repair / modification due to: damage | modification of the extrusion line (machine)

f) Change / modification of the bearings due to abrasion or change to new type or technology

g) Dynamical balancing

h) Pick-up and return – service