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GRN4-610 Chapter 5: Maintenance 55 of 73
Mounting the cutters
NOTE: The cutters and bed knives—especially the cutters—should only be
sharpened or replaced in sets. There is a danger of balance error if a combination
of cutters from different sets is used.
Follow the steps below to mount the cutters.
1. Clean the knife support surface and the hole on the cutter holder.
2. Insert sharp cutter or turn old cutter and push against the cutter holder surface.
3. Attach the cutter mounting bolt (DIN912 – M12x40 – 12.9), and the washer
(DIN433 – 13 – 300HV).
4. Screw in the mounting screws and tighten lightly first. Make sure the cutter
fits planar in the seat!
5. Tighten the cutter mounting bolts using a torque wrench. The required torque for
all cutter mounting bolts is 120 Nm (refer to the torque values table).
6. Make sure the cutting gap is correct and also that the cutters and bed knives do
not collide as the rotor turns.
7. Remove tools and other objects from the cutter chamber.
8. Switch ON the shredder for a brief time without grinding material; listen for
noises. If unusual noises are present, determine the cause and eliminate it.
NOTE: Cutters are reversible and have four symmetrical cutting edges, which
makes it possible to turn the cutters and only to sharpen after every fourth cutter
change.
Sharp knives are dangerous even while the rotor is at standstill.
Serious injury can result—especially to the hands and fingers—wear
protective gloves!