Working on the Cutting Knives

Correctly setting and mounting the cutting knives is important when working with shredders to ensure efficient and economic function.

Replacing and Checking the Cutting Knife Mountings

Certain machine parts are subject to stress during operation as a result of vibrations that can lead to loosening of the screw connections. It is absolutely necessary to check the cutter and bed knife mounting screws in accordance with the maintenance plan.

1.Tighten the mounting screws on the cutters and bed knives using a torque wrench (check required torque for the screw size). The required torque for the knife fixing bolts is 355 Nm.

NOTE: You can find out the required torque from the following table. Tightening capacity decreases for screws when loosened and tightened again several times.

New screws of the same material quality must replace the cutting knife mounting screws after they have been loosened and tightened several times.

 

 

Torque

 

 

 

 

 

 

 

 

Grade 12.9

Bolt type

Grade 8.8

Grade 10.9

 

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

Checking the Condition of the Cutters

WARNING! Danger of cutting caused by sharp knives at all times—even when rotor is at standstill. Serious Injury especially to the hands and fingers can occur. Wear protective gloves!

The cutting knives become blunt after a certain number of operation hours; they should be checked regularly. Using blunt knives 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.

BJ5-620

Maintenance

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Image 44
Sterling SXS Series specifications Working on the Cutting Knives, Replacing and Checking the Cutting Knife Mountings