VHS-60/4 and VHS-70/4 Demolition and Scrap Shears Caterpillar

Cutting Edges and Piercing Tip

Rotate the cutting blades every 60 to 80 hours of operation. The interval between rotations will vary depending on the materials being processed. Cutting edge maintenance is more important when cutting thin materials. More frequent blade rotation or replacement is necessary in these applications.

Regular rotation keeps the blade wear and the gap between the blades uniform and allows the blades to be shimmed properly. Correct shimming of the blades will prevent the jaws from jamming.

Verachtert recommends the rotation of blades and guide blades as a set. The piercing tip blades are rotated or replaced with each cutting blade rotation. Piercing tip blades must always be replaced as a set. In some applications, the piercing tip blades may require rotation or replacement before other required blade rotations.

Inspect the Cutting Edges and the Piercing Tip

1. Clean the shear.

2. Open the jaws of the shear. Lock the jaws in an open position. The following procedures describe maintaining the jaws in the open position.
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   Table 1

   Sales Model	Shear Locks
   VHS-60/4	325-6438
   VHS-70/4	327-5368

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   Illustration 1	g02174182
   Lock for the hydraulic cylinder on the VHS-60/4 and VHS-70/4 shears

   1. In order to hold the shear in the open position for the VHS-60/4 and VHS-70/4, insert shear lock (1) through the hole on the side of the shear. Slide the pipe on the shear lock (1) all the way through the shear. Insert bolt (2) into the hole in the end of the pipe. Install nut (3) onto the bolt. Refer to Table 1 for the part numbers of the shear locks.

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Illustration 2	g02178300

3. Inspect the cutting blades (4), (5), (6), (7) and (8) for excessive wear or damage. Check the cutting blades for cracks. Replace the cutting blades if damaged or cracked.

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Illustration 3	g02178252
(R) Radius (Y) Cutting Blade (Z) Jaw

4. Inspect the radius (R) on the edge of the blade as shown in illustration 3. Rotate or replace the blade if the radius of the cutting edge is greater than 5 mm (0.2 inch).

   Note: Do not operate the shear when the edges of the cutting blades have worn to a radius of 5 mm (0.2 inch) or more. Operating the shear with badly worn edges decreases shear performance. Structural damage to the shear may occur. Badly worn edges cause the hydraulic systems to work harder resulting in premature wear.

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Illustration 4	g02178260
(A) Crack in piercing blade (9A) Drop-side piercing blade (9B) Cut-side piercing blade

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Illustration 5	g02178261
(B) Piercing blade is usable if cracked in this area (9A) Drop-side piercing blade (9B) Cut-side piercing blade

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Illustration 6	g02178262
(C) Piercing blade must be replaced if cracked in this area (9A) Drop-side piercing blade (9B) Cut-side piercing blade

5. Inspect the piercing blades (9A) and (9B) for wear or damage. Inspect the piercing blades for cracks. Replace the blades if damaged or cracked.

   Note: If the blade is cracked, forward of the first bolt hole as shown in illustration 4, the blade can be rotated and used on the opposite side. The cracked portion of the blade must be rotated to the rear position on the opposite side as shown in illustration 5. All other cracks or damage require replacement of the blade, as shown in illustration 6.

Cutting Edges and Piercing Tip - Rotate/Replace

Cutting Edges and Piercing Tip - Removal

1. Clean the shear.

2. Place the shear in a horizontal position. Open the jaws.

3. Lock the jaws in an open position. Refer to Operation and Maintenance Manual, "Inspect the Cutting Edges and the Piercing Tip" for more information.

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Illustration 7	g02178289

4. Remove bolts (10), (11), (12), (13), (14) and (15) and washers. Refer to illustration 7.

5. Remove the following components from the shear:
   • Cutting blades (4), (5), (6), (7) and (8)

   • Piercing blades (9A) and (9B)

   • Dowels (16)

   • Shims (17), (18), (19) and (20)

   Refer to illustrations 2 and 7.

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Do not strike against the cutter with a hardened steel tool of any kind. The cutter may chip and cause severe injury.

6. Clean the blades. Ensure that any burrs, corrosion, or other material are removed. Level any deformations of the blade that rise above the machined surfaces.

7. Clean the blade pockets. Ensure that any burrs, corrosion, or other material are removed.

Cutting Blades on the Moveable Jaw - Installation

1. Open the jaws.

2. Lock the jaws in an open position. Refer to Operation and Maintenance Manual, "Inspect the Cutting Edges and the Piercing Tip" for more information.

3. Inspect the dowels (16). Replace any dowels if damaged.

4. Reuse the cutting blades by rotating to a new edge. Replace the cutting blade if a new blade edge is not available. Replace the cutting blade if damaged or cracked.

5. Apply 5P-3931 Anti-Seize Compound to the dowel pockets of the moveable jaw and the cutting blades.

6. Install the dowels (16) into the moveable jaw.

7. Add shims to the cutting blades in order to measure the required thickness of 52 mm (2.05 inch). The cutting blade thickness plus the thickness of the shims must equal 52 mm (2.05 inch).

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NOTICE
Replace the cutting blade if more than 5 mm (0.2 inch) of shim is required. New cutting edges will require 2 mm (0.079 inch) of shim.

8. Install the cutting blades with the proper thickness of shims into the moveable jaw.

9. Coat the bolts (10), (11), (12), (13), (14) and (15) with 5P-3931 Anti-Seize Compound. Install the bolts and washers.

10. Tighten the bolts. Refer to table 2 for the correct torque value.
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    Table 2

    Torque values for the bolts for the cutting edges
    Sales Model	Bolt Size	Torque Value
    VHS-60/4, VHS-70/4	M20 x 2.5	520 ± 70 N·m (385 ± 50 lb ft)

Piercing Blade - Installation

1. Open the jaws.

2. Lock the jaws in an open position. Refer to Operation and Maintenance Manual, "Inspect the Cutting Edges and the Piercing Tip" for more information.

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Illustration 8	g02178886
Surfaces to inspect

3. Clean the blade pockets. Remove any burrs, corrosion and other material.

4. Inspect the mating surfaces of the blade pockets. Level any deformations of the mating surfaces that rise above the machined surface. Do not remove parent material below the machined surface.

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Illustration 9	g02178929
Typical damage

5. Inspect the dowels (21) for the piercing blades. Replace the dowels if damaged. Refer to illustration 9.

6. Inspect the mating surfaces of the piercing blades during rotation. Level any deformations of the mating surfaces that rise above the machined surface. Do not remove parent material below the machined surface.

7. Apply 5P-3931 Anti-Seize Compound to the dowel pockets of the moveable jaw and the piercing blades.

8. Install the dowels (21) into the moveable jaw.

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Illustration 10	g02178945

9. Position the drop-side piercing blade (9A) on the moveable jaw. Install the bolts (10) from the cut-side. The bolts should only be hand tightened. Ensure that the piercing blade and the mating surfaces of the jaw are properly aligned. Ensure that the piercing blade (9A) is properly aligned over the dowels.

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NOTICE
Do not seat the piercing blade by striking. Striking the piercing blade may result in damage to the blade and to the moveable jaw.

10. Alternately tighten each bolt until the piercing blade slides over the chamfer on the dowels.

    Note: Alternate tightening each bolt a maximum of 1/4 turn at a time. It is acceptable to tap the piercing blade with a soft-faced mallet as the bolts are being tightened. If the piercing blade (9A) will not slide into place, it is misaligned or there is a mating surface that has been damaged. Remove the piercing blade and inspect the surfaces for interference. Grind the mating surface of the moveable jaw if necessary to remove any interference.

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NOTICE
Alignment of the piercing blade is critical. If the blade becomes misaligned before it slides over the dowels, it will not install properly. Do not use excessive torque while positioning the blade into the pocket. Excessive torque will damage the piercing blade and the dowels.

11. Remove the bolts (10) from the cut-side.

12. Repeat steps 3 through 10 for installation of the cut-side piercing blade (9B) .

13. Tighten all four bolts. Torque the four bolts to approximately 68 N·m (50 lb ft).

14. Tighten the drop-side bolts to the final torque value. Refer to table 3.
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    Table 3

    Final Torque values for the bolts for the piercing blades
    Sales Model	Bolt Size	Torque Value
    VHS-60/4	M20 x 2.5	520 ± 70 N·m (385 ± 50 lb ft)
    VHS-70/4	M24 x 3	900 ± 100 N·m (664 ± 74 lb ft)

15. Tighten the cut-side bolts to the final torque. Refer to table 3.

16. Reapply torque to the drop-side bolts.

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Illustration 11	g02179983

17. Check the clearance at the front mating surfaces of the piercing blades and jaw. The clearance should be no more than 0.2 mm (0.0079 inch). If the clearance is greater than 0.2 mm (0.0079 inch), refer to Operation and Maintenance Manual, "Jaw-Repair" for additional information.

18. Check the face of the cutting blades (4) on the moveable jaw. Reshim the cutting blades (4) on the moveable jaw if the cut-side face of the cutting blades (4) is not flush or within ± 0.25 mm (± 0.0098 inch) with the cut-side face of the piercing blade (9B) .

Cutting Blades and Guide Blades on the Fixed Jaw

1. Open the jaws.

2. Lock the jaws in an open position. Refer to Operation and Maintenance Manual, "Inspect the Cutting Edges and the Piercing Tip" for more information.

3. Inspect dowels (16). Replace the dowels if damaged.

4. Reuse the blades 5, 6, 7 and 8 by rotating to a new edge. Replace the blade if a new blade edge is not available.

5. Apply 5P-3931 Anti-Seize Compound to the dowel pockets of the fixed jaw and the blades.

6. Install the dowels (16) into the fixed jaw.

7. Install the blades 5, 6, 7 and 8.

8. Seat the blades in the pocket. Tighten the bolts 12, 13, 14 and 15 to approximately 68 N·m (50 lb ft).

9. Remove the jaw locking device. Refer to Operation and Maintenance Manual, "Inspect the Cutting Edges and the Piercing Tip" for more information.

10. Slowly close the moveable jaw until completely closed.

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NOTICE
Ensure that there is no interference between the cutting blades of the fixed jaw and the cutting blades of the moveable jaw. If there is interference, the hub must be adjusted. Refer toOperation and Maintenance Manual, "Hub Nut - Check/Tighten" for the proper procedure.

11. Loosen the cutting blade bolts (12). Do not remove the bolts. Allow a minimum of three threads to remain engaged in the blades.

12. Position the cutting blades (5) of the fixed jaw flush against the cutting blades (4) of the moveable jaw.

    Note: Tap the heads of the bolts with a soft mallet to position the blades.

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NOTICE
Do not position the blades by striking the bolts with a steel hammer. Striking the blades with a steel hammer may result in damage to the blade and the jaw.

13. Insert the proper quantity of shims. Measure the gap between the blade pocket and the cutting blades to determine the proper shim thickness.

14. Seat the blades in the pocket. Tighten bolts to approximately 68 N·m (50 lb ft).

15. Measure the clearance between the cutting blades on the moveable jaw and the cutting blades on the fixed jaw. Clearance values of 0.3 mm (0.012 inch) to 1 mm (0.039 inch) are acceptable.

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NOTICE
The maximum allowable shim thickness is 5 mm (0.197 inch). If the shim requirement is over 5 mm (0.197 inch), measure the cutting blade thickness. The minimum cutting blade thickness is 47 mm (1.85 inch). If the cutting blade thickness is within tolerance, refer to Operation and Maintenance Manual, "Hub Nut - Check/Tighten" for additional information.

16. Slowly open the jaw. Observe the gap between the blades until the tip exits the lower jaw. The acceptable clearance at all points is from 0.3 mm (0.012 inch) to 1 mm (0.039 inch).

17. Tighten bolts (12) to the proper torque. Refer to table 4.
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    Table 4

    Torque values for the bolts for the cutting edges and guide blades
    Sales Model	Bolt Size	Torque Value
    VHS-60/4, VHS-70/4	M20 x 2.5	520 ± 70 N·m (385 ± 50 lb ft)

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Illustration 12	g02180894

18. Close the moveable jaw so that the piercing tip is positioned as shown in illustration 12.

19. Loosen the guide blade bolts (13) and (15). Do not remove the bolts. Allow a minimum of three threads to remain engaged in the blades.

20. Position the guide blades (6) and (8) flush against the piercing tip (9A) and (9B) .

    Note: Tap the heads of the bolts with a soft mallet to position the blades.

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NOTICE
Do not position the blades by striking the bolts with a steel hammer. Striking the blades with a steel hammer may result in damage to the blade and the jaw.

21. Insert the proper quantity of shims. Measure the gap between the blade pocket and the guide blades to determine the proper shim thickness.

22. Seat the blades in the pocket. Tighten bolts to approximately 68 N·m (50 lb ft).

23. Measure the clearance between the guide blades and piercing tip. Clearance values of 0.3 mm (0.012 inch) to 1 mm (0.039 inch) are acceptable.

24. Tighten bolts (13) and (15) to the proper torque. Refer to table 4.

Cross Blade - Inspect/Replace

1. Open the jaws.

2. Lock the jaws in an open position. Refer to Operation and Maintenance Manual, "Inspect the Cutting Edges and the Piercing Tip" for more information.

3. Inspect the cross blade (7) for wear or damage. Check the cross blade for cracks. Replace the blade if the blade is damaged or cracked.

4. Remove bolts (14) and inspect the blade thickness. Replace the cross blade if the thickness is less than 35 mm (1.378 inch).

5. Inspect the cross blade dowels. Replace the dowels if damaged.

6. Apply 5P-3931 Anti-Seize Compound to the dowel pockets of the fixed jaw and the blades.

7. Install the dowels into the fixed jaw.

8. Install the cross blade (7) and the cross blade bolts (14) .

9. Tighten bolts (14) to the proper torque. Refer to table 5.
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   Table 5

   Torque values for the bolts for the cross blade
   Sales Model	Bolt Size	Torque Value
   VHS-60/4, VHS-70/4	M20 x 2.5	520 ± 70 N·m (385 ± 50 lb ft)