Wiring Harness Damage at the ECM Connectors on Certain 793D Low Altitude Off-Highway Truck Engines{1408, 1901} Caterpillar

Off-Highway Truck:

793D (S/N: FDB1-UP)

Introduction

The problem that is identified below does not have a known solution. Until a permanent solution is known, use the solution that is identified below.

Problem

Low altitude 793D off-highway truck engines with the 424-2194 Engine Harness As and ribbed adapters in the connectors at the engine ECM have experienced some problems with excessive wear on the harness wires. Internal ribs in some adapters can wear through the harness wires and cause various electrical problems.

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Typical connector

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Typical connector

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Excessive wear on the harness assembly

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Excessive wear on the harness assembly

Solution

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(1) The original adapter

1. Remove the cover from the connector.

2. Remove the existing adapter (1) from the harness assembly and connector.

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(2) 290-8070 Tape

Note: 3M Scotch Linerless Rubber Splicing Tape 130C is equivalent to the 290-8070 Tape .

3. If harness assembly braiding is short in this area, wrap the unbraided harness assembly section with splicing tape (2) .

   Note: Stretch and wrap the splicing tape tightly around the unbraided harness assembly section at least two full wraps, but not so many wraps as to fit too tightly inside the connector when installed with the 9X-7462 Grommets .

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(3) 9X-7462 Grommet

4. Install two grommets (3) around the harness assembly.

5. Install the harness assembly into the connector.

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Illustration 8	g03556678

6. Hold the harness assembly in place and install the connector cover.