PART A: Basic machine
Shredder
L 60; L60+
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VIRTUS EQUIPMENT 2018 All rights reserved
Page 50
8.9
Working on the cutting knives
In the case of shredders, the correct grinding properties, correct
setting and mounting of the cutting knives are important factors to
ensure perfect functioning and economic operation of the
machine.
8.9.1
Replacing and checking the cutting knife mountings
Due to their function, certain machine parts are subject to stress in
their operating state as a result of vibrations, which can lead to
loosening of the screw connections. Therefore, it is absolutely
necessary to check the cutting knife mounting screws in
accordance with the
Maintenance plan
.
Tighten the mounting screws on the cutting knives using a torque
wrench which is set to the required torque for the screw size.
The required torque for the knife fixing bolts is 120 Nm.
You can find out the required torque from the following table. Take
note too that the tightening capacity decreases of screws which
have been loosened and tightened again several times.
New screws of the same material quality must therefore replace
the cutting knife mounting screws after they have been loosened
and tightened several times.
Torque:
Bolt 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
