GSH15 and GSH20 Orange Peel Grapples Caterpillar

Inspecting the Tip

Illustration 1	g01158335

Wear or damage at the tip will result in reduced operating convenience.

Inspect the tip (2) for wear. If the tip is blunt or damaged, the tip should be replaced.

Note: If wear or damage is notice at one or more tips, all tips must be replaced.

Replacing the Tip

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Do not operate or work on this machine or work tool unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals and Owner's Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Caterpillar dealer for replacement manuals. Proper care is your responsibility.

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Personal injury or death can result from sudden work tool movement. Sudden movement of the work tool can cause injury to persons near the work tool. To prevent injury or death, make sure that the area around the work tool is clear of personnel and obstructions before operating the work tool.

1. Clean the grapple before performing any repairs.

2. Inspect the grapple. Refer to Operation and Maintenance Manual, "Daily Inspection" for additional information.

3. Perform all other repairs before replacing the tips.

Removing the Tip

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Personal injury can result from flame cutting or welding on painted areas. The effect of gasses from burned paint is a hazard to the person doing the cutting or welding. Do not flame cut or weld on painted areas.

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Illustration 2	g01158337

1. Remove all the paint from the tip (2) and from the shell (1) .

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Illustration 3	g01158342

2. Flame cut the welds away from the tip (2) and the shell (1) .

   Note: Start flame cutting from the tip's side of the weld and cut toward the welds. Refer to illustration 3 for the proper cutting direction. Stop cutting when you reach the shell's surface. The tip is scrapped metal.

3. Remove the tip (2) from the shell (1) .

4. Grind the contact surface flat.

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Illustration 4	g01157060

5. Machine the corners. Refer to illustration 4 and table 1.
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   Table 1

   Grapple	(Y)	(Z)
   GSH15	10 mm (0.39 inch)	10 mm (0.39 inch)
   GSH20	12 mm (0.47 inch)	10 mm (0.39 inch)

6. Clean the surfaces.

Installing the Tip

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Personal injury or death can result from fumes, gases and ultraviolet rays from the weld arc. Welding can cause fumes, burn skin and produce ultraviolet rays. Keep your head out of the fumes. Use ventilation, exhaust at the arc, or both, to keep fumes and gases from your breathing area. Wear eye, ear and body protection before working. Protect yourself and others; read and understand this warning. Fumes and gases can be dangerous to your health. Ultraviolet rays from the weld arc can injure eyes and burn skin. Electric shock can cause death. Read and understand the manufacturer's instructions and your employer's safety practices. Do not touch live electrical parts. See "American National Standard Z49.1, Safety in Welding and Cutting" published by the American Welding Society. American Welding Society 2501 N.W. 7th Street Miami, Florida 33125 See "OSHA Safety and Health Standards, 29 CFR 1910", available from U.S. Department of Labor. U.S. Department of Labor Washington, D.C. 20210

Illustration 5	g01307508
(1) Shell (2) Tip (3) Ruler

1. Position tip (2) on shell (1) of the GSH Grapple.

2. Tack weld the tip (2) onto the shell (1) on the inside. Use the following welding materials in order to weld the tip onto the shell:
   • AWS A5.28-96:ER100S-G

3. Repeat the above steps for all the other shells (1) .

4. Close the shells (1) on the GSH Grapple.

5. Position the tips (2) on all the shells in relation to each other.

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Illustration 6	g01307511

6. Check the end stops. If necessary, repair the end stops.

   Note: The end stops must be closed without any play between the contact surfaces of the end stops.

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Illustration 7	g01157274

7. Preheat the surface of the tip (2) and the shell (1) to 150 °C (302 °F) to 200 °C (392 °F).

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Illustration 8	g01325597

8. Weld the tips (2). Refer to illustration 7. Refer to illustration 8 for the weld specifications. Use the following welding materials in order to weld the tips:
   • AWS A5.28-96:ER100S-G

9. The welds must cool slowly with no forced air. Allow the welds to reach and ambient temperature.

10. Close the shells (1) on the GSH Grapple.

11. Check the end stops. If necessary, repair the end stops.

    Note: The end stops must be closed without any play between the contact surfaces of the end stops.

Painting the Tip and Shell

1. Clean all of the parts.

2. Paint the welded areas with primer.

3. Allow the primer to completely dry.

4. Paint the welded areas with a final coat of paint.

Returning to Operation

The hydraulic system must be purged of air before the work tool can be returned to operation.

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Personal injury or death can result from improperly checking for a leak. Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.

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Purge the hydraulic system for the grapple after work has been completed. If there is air in the hydraulic system under pressure, the oil can spontaneously ignite. Failure to purge the hydraulic system will result in damage to the work tool. Personal injury or death can result from failure to purge the hydraulic system.

The Hard Surfacing of the Tip

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Do not operate or work on this machine or work tool unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals and Owner's Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Caterpillar dealer for replacement manuals. Proper care is your responsibility.

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Personal injury or death can result from sudden work tool movement. Sudden movement of the work tool can cause injury to persons near the work tool. To prevent injury or death, make sure that the area around the work tool is clear of personnel and obstructions before operating the work tool.

1. Clean the grapple before performing any repairs.

2. Inspect the grapple. Refer to Operation and Maintenance Manual, "Daily Inspection" for additional information.

3. Perform all other repairs before replacing the tips.

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Personal injury or death can result from fumes, gases and ultraviolet rays from the weld arc. Welding can cause fumes, burn skin and produce ultraviolet rays. Keep your head out of the fumes. Use ventilation, exhaust at the arc, or both, to keep fumes and gases from your breathing area. Wear eye, ear and body protection before working. Protect yourself and others; read and understand this warning. Fumes and gases can be dangerous to your health. Ultraviolet rays from the weld arc can injure eyes and burn skin. Electric shock can cause death. Read and understand the manufacturer's instructions and your employer's safety practices. Do not touch live electrical parts. See "American National Standard Z49.1, Safety in Welding and Cutting" published by the American Welding Society. American Welding Society 2501 N.W. 7th Street Miami, Florida 33125 See "OSHA Safety and Health Standards, 29 CFR 1910", available from U.S. Department of Labor. U.S. Department of Labor Washington, D.C. 20210

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Personal injury can result from flame cutting or welding on painted areas. The effect of gasses from burned paint is a hazard to the person doing the cutting or welding. Do not flame cut or weld on painted areas.

Illustration 9	g01234313

Note: The hard surfacing will improve the abrasion resistance of tip (1). The hard surfacing is not used to build the tip back up to the original size.

1. Inspect tip (1) for wear. If the tip is blunt or damaged, the tip should be replaced. Refer to Operation and Maintenance Manual, "Replacing the Tip" for additional information.

2. Grind the surface of the tip that will be welded. The surface should be clean and free of paint and rust.

3. Preheat the surfaces of tip (1) to 150 °C (302 °F) to 200 °C (392 °F).

4. These items are recommended for the hard surfacing of the material:
   • Lincoln Wearshield ME welding rod

   • ESAB Wear Arc-5 welding rod

   • Welding material according to DIN8555 MF6-55GP

   • Welding material with the chemical composition that is mentioned in Table 2

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   Table 2

   C (%)	Mn (%)	Si (%)	Cr (%)	Mo (%)	Hardness HRC (1)
   0.5-0.8	0.6-1.0	0.6-1.0	4.5-6.5	0.8-1.2	56-61

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   ( 1 )

   Rockwell C-Scale Hardness

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Illustration 10	g01234316
Recommended pattern for welding The maximum height of the weld is 3 mm (0.12 inch).

5. Apply single passes next to each other. Do not stack the welds. Do not extend the welds onto shell (2). Refer to Operation and Maintenance Manual, "Welding on Machines and Engines with Electronic Controls" for additional information.

6. Remove all the debris from the welds. Allow the welds to cool slowly to ambient temperature. Do not use forced air.

7. Repeat the above steps for all tips.

8. Check the end stops. If necessary, repair the end stops.

Note: The end stops must be closed without any play between the contact surfaces of the end stops.

Painting the Tip and Shell

1. Remove all the debris from the welded area.

2. Paint the welded area with primer.

3. Allow the primer to dry completely.

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

Returning to Operation

The hydraulic system must be purged of air before the work tool can be returned to operation.

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Personal injury or death can result from improperly checking for a leak. Always use a board or cardboard when checking for a leak. Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.

Show/hide table

Purge the hydraulic system for the grapple after work has been completed. If there is air in the hydraulic system under pressure, the oil can spontaneously ignite. Failure to purge the hydraulic system will result in damage to the work tool. Personal injury or death can result from failure to purge the hydraulic system.