Lukas Concrete crushers - Manual (Page 37)

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10.3.3 Regrinding the crusher arms
Grinding area
Only burrs may be removed and smoothed out!
Chips or deep grooves cannot be ground away. The crusher arms must be replaced in these
cases.
CAUTION!
Only grind in the grinding area (see illustration)!
The sliding faces, in particular, must not be reground!
Tools required: 1. Clamping device (e.g. vice) with jaw protection in order not to
damage the crusher arms.
2. Grinder (e.g. angle grinder or belt grinder) with abrasive having
a grain size of 80.
Procedure:
1. Clamp the crusher arm securely into the clamping device so that it cannot move, but with
the area to be ground exposed.
2. Carefully grind the burr away evenly until you reach the sliding surface level. (see
illustration).
CAUTION!
If you have not maintained the smoothness or rake, the proper operation of the
blade is no longer guaranteed and the crusher arms must be replaced.
In addition, when grinding, you must make sure that the rake of the cutting surface in the
direction of the crusher arm movement is not changed. Check the rake and smoothness
of the ground surface, using a suitable measuring tool.
Direction of
movement
Crusher arm
Pivot point
Crusher arm
Slide surface plane
Slide surface
plane