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

Adjustment Procedure For The Hub of the Movable Jaw on Shears

Hub (Check)

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Illustration 1	g02185393
(A) Drop-side (B) Cut-side

1. On a machine, position the shear vertically with the fixed jaw on a flat and a level surface.

2. Lock the jaws in an open position. Refer to Operation and Maintenance Manual, "Cutters - Inspect/Replace" for the proper procedure.

3. Use a prybar to check the lateral movement of the movable jaw.

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Illustration 2	g02185399

4. Place the prybar between the movable jaw and inside of the housing on the cut-side (B) and push the movable jaw to the drop-side (A). Refer to Illustration 2.

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Illustration 3	g02185401

5. Observe area (BB). The movable jaw should move less than 0.5 mm (0.020 inch).

6. If the movable jaw moves laterally more than 0.5 mm (0.020 inch), the movable jaw hub must be adjusted.

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Illustration 4	g02185402

7. Place the prybar between the movable jaw and the inside of the shear housing on the drop-side (A) and push the movable jaw to the cut-side (B). Refer to Illustration 4.

8. Observe area (AA). The movable jaw should move less than 0.5 mm (0.02 inch).

9. If the movable jaw moves laterally more than 0.5 mm (0.02 inch), the movable jaw hub must be adjusted.

   Note: Operation of the shear with to much lateral play on the pivot point could result in structural damage to the shear.

10. If the movable jaw is within the specification, make sure that the clearance between the cutting edges is correct. Refer to the Operation and Maintenance Manual, "Cutters - Inspect/Replace" for additional information.

11. If the movable jaw is within the specification, make sure that the clearance between the guide blade and the movable jaw is correct. Refer to the Operation and Maintenance Manual, "Cutters - Inspect/Replace" for additional information.

Hub (Adjustment)

1. On a machine, position the shear vertically with the fixed jaw on a flat and a level surface.

2. Lock the jaws in an open position. Refer to Operation and Maintenance Manual, "Cutters - Inspect/Replace" for the proper procedure.

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Illustration 5	g02185433

3. Access the guide blade (C) .

4. Use a small grinder to clean the cutting edges of the movable jaw and the fixed jaw. Remove any sharp burrs. Smooth out any deformations.

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Illustration 6	g02185473

5. Loosen bolts (D) in order to remove the guide blade shims.

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Illustration 7	g02185534

6. Remove the shims (E) from the fixed jaw.

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Illustration 8	g02185553

7. Loosen and remove the locking bolts (F) and lock washers from the drop-side and the cut-side of the hub in the shears housing.

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Illustration 9	g02185554

8. Loosen and remove the nuts from both the cut-side and the drop-side using wrench (G) that is supplied with the shear.

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Illustration 10	g01671475

9. Mark the locations of the locking bolt holes of both the drop-side and the cut-side so the holes can be located when the nuts are reinstalled.

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Illustration 11	g02185556

10. Remove shims (H) from the drop-side of the shears hub.

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Illustration 12	g02185557

11. Install nut (J) on the drop-side. Tighten the nut to 800 N·m (590 lb ft) in order to move the jaw assembly toward the drop-side of the shear. Moving the jaw assembly toward the drop-side of the shear creates clearance for the knives.

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Illustration 13	g02185573

12. Remove the drop-side nut and install adjuster ring (K) .

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Illustration 14	g02185557

13. Install drop-side nut (J). Tighten the drop-side nut to 800 N·m (590 lb ft) in order to remove any clearances between hub pieces.

14. Remove the shear lock. Refer to Operation and Maintenance Manual, "Cutters - Inspect/Replace" for the proper procedure. Carefully close the movable jaw.

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Illustration 15	g02185653

15. Apply a liberal amount of 5P-3931 Anti-Seize Compound to the threads of the hub pin and to the threads of the cut-side hub nut. Install the cut-side nut (L) .

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Illustration 16	g02185693

16. Tighten the cut-side nut (L) until clearance between the movable jaw cutting edges and fixed jaw cutting edges is 0.5 mm (0.02 inch). Then turn the cut-side nut clockwise until the next threaded hole of the housing lines up with a locking bolt hole in the cut-side nut.

    Note: Do not turn the cut-side nut counterclockwise in order to align locking bolt holes. Turning the cut-side nut counterclockwise will introduce looseness into the hub pivot assembly and produce an inaccurate shim measurement in the following steps.

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Illustration 17	g02185553

17. Install the lock washers and install and tighten lock bolts (F) in the threaded holes of the shear through the locking bolt holes of the nut as shown above. Tighten the locking bolts to 240 ± 40 N·m (177 ± 30 lb ft).

18. Remove the drop-side nut (J). Remove the adjuster ring (K) .

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Illustration 18	g02185713

19. Use a caliper to measure the depth for the shims that are required. Install the required number of shims (H). Shims (H) should be even with or above surface (M). A thin film of grease may be required in order to keep the shims in position during the following steps. Thick shims should go on the outside of the hub.

    Note: The shims may be a maximum of 0.5 mm (0.02 inch) above surface (M). The shims must not be below the surface. Failure to adjust to these measurements will introduce looseness into the hub and a reduced service life of wear components.

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Illustration 19	g02185733

20. Apply a liberal amount of 5P-3931 Anti-Seize Compound to the threads of the hub pin and to the threads of the drop-side hub nut (J). Install the drop-side nut (J). Tighten the drop-side nut (J) to 800 N·m (590 lb ft). If the specified torque is reached before a hole in the nut aligns with a threaded hole in the shear housing, continue turning the nut clockwise until a set of holes line up with a set of threaded holes in the shear housing.

21. Install the lock washers and install and tighten locking bolts to 240 ± 40 N·m (177 ± 30 lb ft).

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Illustration 20	g02185775

22. Close the moveable jaw so that the piercing tip is positioned as shown in illustration 20.

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Illustration 21	g02185833

23. Loosen the guide blade bolts (D). Do not remove the bolts. Allow a minimum of three threads to remain engaged in the blades.

24. Position the guide blade (C) flush against the piercing tip.

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

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

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Illustration 22	g02185816

25. Insert the proper quantity of shims. Measure the gap (P) between the blade pocket and the guide blade to determine the proper shim thickness.

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

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Illustration 23	g02185998

27. Measure the clearance (R) between the guide blade and the piercing blade on the moveable jaw. Clearance values of 0.3 mm (0.012 inch) to 1 mm (0.039 inch) are acceptable.

28. Tighten bolts (D) to the proper torque. Refer to table 1.
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    Table 1

    Torque values for the bolts for the 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)