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BJ5-615 Chapter 5: Maintenance 48 of 85
7. Turn the rotor by hand
8. Check whether the cutting gap is correct and make sure the cutting cutters
do not collide as the rotor turns.
9. Put back the cover plates and mount them with the screws.
10. Remove tools and other objects from the cutting chamber.
11. Put screen back and mount it.
12. Switch ON the shredder for a short time without grinding material and listen for
noises. If there are unusual noises, determine the cause and eliminate it.
NOTE: Cutters are reversible and have four symmetrical cutting edges. This makes
it possible to turn the cutters and only to sharpen after every fourth cutter
change.
WARNING! Danger of cutting caused by sharp cutters at all times—even when rotor is at
standstill. Serious Injury especially to the hands and fingers can occur. Wear protective
gloves!
Sharpening Cutters and Bed Knives
Shredder cutters have 4 cutting edges. This means they can be turned 3 times. The
cutters should be replaced after the third use. Bed knives can be turned 2 times and can
be re-sharpened as long as you can mount them with the long hole.
1. Dismount the cutting cutters (see “dismounting the rotor cutters”).
2. Sharpen the cutters and bed knives.
NOTE: A specialist in accordance with the sharpening plan using particular care
should uniformly sharpen the cutting cutters mechanically. It is important to
make sure that sharpening takes place 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 ground out; otherwise the
number of possibilities for sharpening is unnecessarily reduced. For the
sharpening process, use soft grinding wheels (Quality 40 H or 46 K). Cutters,
which have grinding cracks, are not to be reused due to danger of breakage
during operation.
3. Whet the cutting edges of the cutting cutters using a whetstone.
NOTE: the service life of the cutting cutters can be increased by taking these
measures.
4. Set the cutters and bed knives (refer to “Setting the cutters”).
5. Mount the cutters and bed knives (see “Mounting the cutters and bed knives”).
NOTE: The cutting cutters, in particular the cutters, should only be sharpened or
replaced in sets. There is a danger of balance error if a combination of cutters from
different cutter sets is used.