Edition: 11/2007
Technical Instructions
Commissioning and Maintenance Guide
TAM 00 526
Page 14 / 18
Replacement carbon brushes are usually adapted to the radius of the commutator on the contact sur-
face. If this is not the case, you must sand the brushes to size using fine sandpaper.
To do this, you place the sandpaper between the brushes and the commutator and turn the sandpaper
evenly in the impeller's direction of rotation. (Important: the rough side of the sandpaper must be to-
wards the carbon brushes—see figure below).
1 Carbon Brush 2 Sandpaper 3 Commutator
After sanding, carefully remove as much of the grit and fine particles as possible from the brush rocker
and the commutator.
Twisting the brushgear
To change the carbon brushes, you release the locking screws from the operator opening on the ter-
minal box side and loosen and twist the brushgear.
After changing the brushes, turn the brushgear back to its original position with the marks on the end
shield and the brushgear lined up exactly with one another.
Commutator
Keep the commutator free of dust and oil: at least every 600 operating hours – or depending on the
amount of wear, wipe off the oil with a dry rag and blow off any loose dust! Remove any damage, such
as burn stains, beads of molten metal, rough areas and slight grooving, using progressively finer
grades of sandpaper. While doing this, ensure that you don't sand the commutator out-of-round. Care-
fully blow out the grit!
The patina (the discolouration ranging from light to dark brown of the brush paths) shows that the
equipment is operating properly and should never be removed. Out-of-round running surfaces, pro-
truding segments, pitting and grooving can only be corrected by specialist machining (skimming).
Brush-holder position
Adjust the holder to a distance of about 1.5 mm to the commutator surface when the commutator has
been outside diameter-turned.
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