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GRN4-610 Chapter 5: Maintenance 58 of 73
Setting the cutters and bed knives
Rotor knives used in this machine don’t have to be adjusted. All adjustments have to be
done with the bed knives. To simplify knife setting and shorten the standstill, the bed
knives have four adjusting screws—two for pulling and two for pushing the knife.
Standstill needs to be avoided/reduced if there are multiple cutter sets. Setting the gap
between the cutters and bed knives carefully and correctly is an important requirement
for the productivity of the shredder. Factors for the size of the gap include the size and
design of the rotor and the material to be ground.
Follow the steps below to set the cutters and bed knives.
1. Remove old knives.
2. Insert sharp knife or turn old knife.
3. Attach the knife adjusting bolts and adjust them roughly. Attach the knife
mounting bolts (DIN912 – M12x55 – 12.9) and tighten lightly first.
4. Adjust the gap between the cutter and bed knife to 0.3 in. to 0.4 in. (0.8 to 1 mm).
5. Tighten the knife mounting bolts using a torque wrench. The required torque for
all knife mounting bolts is 120 Nm (refer to torque values table).
6. Turn the rotor by hand.
7. Make sure the cutting gap is correct and also that the cutters and bed knives do
not collide as the rotor turns.
8. Mount the knife cover plates.
Transporting and storing the cutters and bed knives
Sharp knives present danger of cutting! Serious injury can result—
especially to the hands and fingers—wear protective gloves!
• Only transport and store the packaged cutters and bed knives.
• Grease the cutters and bed knives to avoid rust.
• Protect the cutting edges with doubled cardboard, and use adhesive
tape to safeguard the cutters and bed knives from slipping out of the
sides.
• After unpacking, the cutters and bed knives MUST be de-greased in
order to promote a safe grip!