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

Inspect the Wear Plates

1. Clean the shear.

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Illustration 1	g02170373

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

3. Lock the jaws in an open position. The following procedures describe maintaining the jaws in the open position.
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   Illustration 2	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 3	g01450015

4. Inspect all wear plates (L) for excessive wear or damage. If the wear plates (L) have excessive wear or damage, wear plates (L) must be replaced.

   Note: New wear plates contain cracks, due to the hardness of the material. Cracks on new wear plates are not caused from wear or damage.

Replace the Wear Plates

1. Clean the shear.

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Illustration 4	g02170373

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 Wear Plates" for more information.

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Illustration 5	g01450015

4. Grind the existing wear plates (L) in order to remove the wear plates. The existing wear plates (L) can only be removed by grinding off the wear plates.

5. Grind the surface of the end plate (Z). The surface should be clean and free of rust.

6. Remove the paint from the end plate (Z).
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   Table 2

   SHEAR	VHS-60/4	VHS-70/4
   (A)  (1)	30 ± 3 mm (1.18 ± 0.12 inch)	20 ± 3 mm (0.79 ± 0.12 inch)
   (B)	30 ± 3 mm (1.18 ± 0.12 inch)	30 ± 3 mm (1.18 ± 0.12 inch)
   (C)	20 ± 3 mm (0.79 ± 0.12 inch)	20 ± 3 mm (0.79 ± 0.12 inch)
   (K)		20 ± 3 mm (0.79 ± 0.12 inch)
   (H)	8 mm (0.32 inch)	10 mm (0.39 inch)
   Wear Plates (L)	235-0916 (3x)	234-5067 (3x)

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   ( 1 )

   Measure to the bottom of the wear plates

   Note: New wear plates contain cracks, due to the hardness of the material. Cracks on new wear plates are not caused from wear or damage.

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Illustration 6	g02174923
Typical example for locations of wear plates

7. Tack weld the new wear plates (L) to the end plate (Z) of the housing (Y). Check for proper positioning. Refer to table 2 and illustration 6 for dimensions and part numbers of the wear plates.

8. Preheat the surface of the end plate (Z) to 150 °C (302 °F) to 200 °C (392 °F).

9. In order to weld the wear plate (L), use welding material AWS A5.28-96: ER100S-G.

10. Slowly cool the weld to room temperature. Wrap the weld in an insulating blanket to allow the weld to cool over several hours.

    Note: Replacing the wear plates should be performed at the end of the day or at a time when the weld will have time to cool. The weld should have time to cool before the shear is placed back into operation.

11. Remove all debris from the welds. Paint the welded area with primer. Allow primer to dry.

12. Paint the welded area with a final coat of paint.

13. Remove the shear lock. Refer to Operation and Maintenance Manual, "Inspect the Wear Plates" for more information.