2001/01/29 Caterpillar

Wheel Harvesters:

550 (S/N: 7ZN1-UP)

570 (S/N: 4XR1-UP)

580 (S/N: 7CN1-UP)

Description of Change: A new guard is now used on the wiring harness that passes through the hitch on wheel harvesters. The guard protects the harness from external damage and from the penetration of water.

Adaptable To: The new 186-5034 Guard As is effective with 550 (S/N: 7ZN174-UP), 570 (S/N: 4XR183-UP), and 580 (S/N: 7CN203-UP) Wheel Harvesters. The 186-5034 Guard As is adaptable to first production of the listed wheel harvesters.

1. Lower the machine. Lower the harvester head to the ground.

2. Stop the engine. Turn the battery disconnect switches to the OFF position.

3. Disconnect the wiring harnesses from the back of the DASA computer in order to prevent damage to the computer during welding.

4. Remove the guards behind the cab which surround the area that is shown in Illustration 1.

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Illustration 1	g00768995

5. Use the 186-5034 Guard As as a guide. Mark the location on the mounting plate of the harness for the hole that is shown in Illustration 1.

6. Drill a 11.5 mm (0.47 inch) hole in the position that was found in Step 5.

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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

7. Weld a 8T-3612 Weld Nut over the hole that was made in Step 6.

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Illustration 2	g00768997

8. Use the 186-5034 Guard As as a guide. Mark the location on the mounting plate of the harness for the two holes for the mounting bolts that are shown in Illustration 2.

9. Drill two 9.5 mm (0.375 inch) holes in the positions that were found in Step 8.

10. Mount the 186-5034 Guard As to the mounting plate for the harness with three 8T-4189 Bolts and three 8T-4224 Hard Washers .