VHS10, VHS30, VHS40, VHS50, VHS60 and VHS70 Work Tools Caterpillar

Inspect the Cutters

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Illustration 1	g00763257
Hydraulic cylinder for VHS-30 through VHS-70

1. Open the jaw of the shear. The following procedures describe maintaining the jaw in the open position.

   1. In order to hold the shear in the open position for the VHS-30 through VHS-70, install shear lock (1) onto cover (3). The shear lock must be installed behind guide block (2) for the cover. Refer to Table 1 for the part numbers of the shear locks.

2. Inspect the cutters for wear or damage. Check the cutters for cracks.

3. Inspect the radius of the cutting edge of the cutter. If the radius of the cutting edge is greater than 5 mm (0.2 inch) you must replace the cutter.

4. If the cutter is damaged or the cutter is cracked, you must replace the cutter.

Replace the Cutters

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Illustration 2	g00763257
Hydraulic cylinder for VHS-30 through VHS-70

1. Open the jaw of the shear. The following procedures describe maintaining the jaw in the open position.

   1. In order to hold the shear in the open position for the VHS-30 through VHS-70, install shear lock (1) onto cover (3). The shear lock must be installed behind guide block (2) for the cover. Refer to Table 1 for the part numbers of the shear locks.

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Illustration 3	g01145275

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Illustration 4	g01144121

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Illustration 5	g01144130

2. Remove bolts (13), and washers (14) from lower jaw (18) .

3. Remove the guide blade (7), the bushings (11), and the shims (4) (5) from the lower jaw (18) .

4. Remove the bolts (15) (16), the washers (14), the cutting edges (6) (10), the guide blade (7), the shims (3) (4) (5) (9), and the bushings (11) from the jaws.

5. Measure the amount of shims (3) (4) (5) (9) that are under the cutting edges and guide blades (7). Record the amount of shims. Cutting edges (6) (10) at the front of the jaws and guide blades (7) on the shear jaws are equipped with a bushing (11) .

6. Clean all parts.

7. Check cutting edges (6) (10) and guide blades (7). If there is an unused edge, you can use the cutting edges (6) (10) and guide blades (7) again. Clean all surfaces of the cutting edges and guide blades. Grind any burrs on the cutting edge and guide blades.

8. Inspect the pockets for the cutting edge and guide blades for any wear of damage. If necessary, repair the jaw. Refer to the Operation and Maintenance Manual, "Jaw - Repair" for more information.

9. Reinstall bushings (11), cutting edges, and guide blade (7). Do not install shims.

10. Install bolts and washers. Do not tighten. Coat the bolts with 5P-3931 Anti-Seize Compound .

    Note: The cutting edge and guide blades must be in front of the base material in order to reduce the wear of the base material.

11. Install shims in the lower jaw and in the upper jaw. The shims must equal a minimum of 2 mm (0.08 inch). Shims are used in order to adjust the clearance between the cutting edges.

12. Coat the bolts with 5P-3931 Anti-Seize Compound .

13. 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-10	M12 x 1.75	105 ± 20 N·m (75 ± 15 lb ft)
    VHS-30	M20 x 2.5	530 ± 70 N·m (390 ± 50 lb ft)
    VHS-40	M20 x 2.5	530 ± 70 N·m (390 ± 50 lb ft)
    VHS-50	M20 x 2.5	530 ± 70 N·m (390 ± 50 lb ft)
    VHS-60	M20 x 2.5	530 ± 70 N·m (390 ± 50 lb ft)
    VHS-70	M24 x 3.0	900 ± 100 N·m (664 ± 74 lb ft)

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Illustration 6	g00763257

14. Remove shear lock (1) from the cover (3) .

15. Start the host machine.

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Illustration 7	g01144340

16. Slowly close the upper jaw. When the surface of the cutters are close, stop the jaw.

17. Inspect the upper jaw for wear. If the dimension (B) is greater than10 mm (0.4 inch), the upper jaw must be repaired. Refer to the Operation and Maintenance Manual, "Jaw - Repair".

18. Measure the clearance between the surface of the upper jaw and the guide blade (7). The clearance between the surface of the upper jaw and guide blade must be less than 1.0 mm (0.04 inch). Use the shims to adjust the amount of clearance. If the thickness of the shims is greater than 5.0 mm (0.20 inch), wear plate (17) must be replaced.

19. Measure the clearance between the cutting edge (10) of the upper jaw and cutting edge (6) of the lower jaw. The clearance between the surface of the upper jaw and guide blade must be less then 0.5 mm (0.02 inch). Use the shims to adjust the amount of clearance.

    Note: Refer to Table 3 for a guide to the clearance between the cutters.

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    Table 3

    Maximum Clearances Between the Cutters
    Thickness of material to cut	Cutter	Guide Cutter
    Less than 6 mm (0.23 inch)	0.5 mm (0.02 inch)	1 mm (0.04 inch)
    Greater than 6 mm (0.23 inch)	Less than 2 mm (0.08 inch)	Less than 5 mm (0.20 inch)

20. Loosen bolts.

21. Install the shims that are needed for the proper clearance.

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