2006/07/24 Caterpillar

Landfill Compactor:

836G (S/N: BRL1-UP; 7MZ1-UP)

Wheel Dozer:

834G (S/N: BPC1-UP; 6GZ1-UP)

Wheel Loader:

988G (S/N: BNH1-UP; 2TW1-UP)

ReferenceRefer to Special Instruction, REHS2854, 30 March 2006, "Procedure for the Retrofit Conversion of Sealed Electronics Bay". This is a alternative option to the special instruction.

Water is accumulating in the electronics bay. Water enters the electronics bay from the following locations:

• Electrical connectors

• Weld seams

• Rubber seals on door openings

Water also accumulates from condensation in the electronics bay. This procedure adds an improved drain to the electronics bay.

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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 1	g01263664
278-7109 Cover (1) (A) Location of drilled holes

Note: For steel mill applications, do not install the 278-7109 Cover .

To modify the 134-6724 Wiring Enclosure Gp, perform the following procedures.

1. Drill a 12.7 mm (0.5 inch) drain hole. The hole should be drilled in the rear inside corner on the bottom of the enclosure for the electronics.

2. Install the 278-7109 Cover (1). Tack Weld the cover or bolt the cover onto the rear inside corner of the electronics bay in order to prevent water and material from entering through the drilled hole. If the cover is bolted, drill two 12 mm (0.472 inch) holes in the side walls and install two 8T-4139 Bolts, two 8T-4244 Nut and four 8T-4223 Hard Washer .

In order to eliminate corrosion in the electronics bay, perform the following steps. This will also prevent any future corrosion in the electronics bay.

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Illustration 2	g01274942
View of the Electronics Bay

1. Apply 4C-4200 Paint (HIGH GLOSS YELLOW) in order to stop corrosion on the terminals and corrosion on other components within the electronics bay.

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Illustration 3	g01274988

2. Apply 4C-4200 Paint to marked locations (B). Do not apply paint in location (C). The main relay terminals need to be painted. The starter relay terminals need to be painted. The terminals for the circuit breaker need to be painted.

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Illustration 4	g01275043

3. The relays (D) should not be painted.

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Illustration 5	g01275083

4. The black cover is the fuse holder. The fuse terminals that are located under the holder (E) should be painted.

   Note: Machines that are working in coal applications may experience rust on the electrical connectors. Apply dielectric grease to the electrical connectors. Do not apply the grease to the pins and the sockets that are located in the electrical connectors.