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BJ5-615 Chapter 5: Maintenance 43 of 85
Checking the Condition of the Cutters
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!
The cutting cutters become blunt after a certain number of operation hours; they should be
checked regularly. Using blunt cutters can affect the efficiency and performance of the
machine in the following ways:
• Decreased shredding capacity.
• Increased current consumption of the drive motor.
• Inexact cut.
• Overheating of the shredded material.
Dismounting the Cutters (see drawing below)
1. Switch OFF the shredder at the main switch.
2. Safeguard main switch using a padlock.
3. Open the machine door.
4. Safeguard the machine door.
5. Remove screen.
NOTE: Although it is possible to reach the cutting shaft by climbing into the
feeding chamber, it is recommended to access the cutters through the
machine door located at the front of the machine. The shaft can be
rotated manually by turning the motor v-belt pulley.
6. Clean the hexagon head socket of the cutter mounting screw (2).
7. Loosen the screw using a high quality Allen key (10 mm). Knock the Allen key
lightly with a hammer to loosen it if necessary.
8. Take out the cutter mounting screw, the washer, and the cutter.
Torque
Screw type Grade 8.8 Grade 10.9 Grade 12.9
Nm lbf ft Nm lbf ft Nm lbf ft
M8 25 18.4 35 25.8 41 30.2
M10 49 36.1 69 50.9 83 61.2
M12 86 63.4 120 88.5 145 106
M16 210 154 295 217 355 261
M20 410 302 580 428 690 508
M24 710 523 1000 737 1200 885