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GRN4-610 Chapter 5: Maintenance 57 of 73
Sharpening cutters and bed knives
Shredder cutters have four cutting edges, which means they can be turned three times.
After the third turn, they should be replaced with new ones. Bed knives can be turned
two times and can be re-sharpened for as long as they can be mounted with the long hole.
NOTE: Specialist sharpening of the cutters and bed knives is available through customer
service.
NOTE: The cutters and bed knives—especially the cutters—should only be sharpened or
replaced in sets. There is danger of balance error if a combination of cutters from
different sets is used.
Follow the steps below to sharpen the cutters and bed knives.
1. Dismount the cutters.
2. Sharpen the cutters. A specialist should use the sharpening plan to uniformly
sharpen the cutting knives mechanically. It is important to make sure that
sharpening takes places with small grinding allowance and sufficient coolant
supply. The sharpening process is finished when the cutting edge is sharply cut.
Not all indentations must be worked out, or the number of possibilities for
sharpening is reduced. For the sharpening process, use soft grinding wheels
(40H or 46K). Knives with grinding cracks should not be re-used due to danger
or breakage during operation.
3. Whet the cutting edges of the cutters and bed knives with a whetstone.
4. Set the cutters and bed knives.
5. Mount the cutters and bed knives.
Sharp knives are dangerous even while the rotor is at standstill.
Serious injury can result—especially to the hands and fingers—wear
protective gloves!