- Off-Highway Truck/Tractor
- 793D (S/N: FDB1-UP)
Introduction
The problem that is identified below does not have a known permanent solution. Until a solution if found, use the solution that is identified below.
Problem
On Certain 793D Off-Highway Trucks, the engine wiring harness and air conditioning jumper harness are not compatible with the chassis wiring.
A 520-7380 Engine Harness As and 520-7381 Engine Harness As were sold through the parts system to dealers and installed on reman engines. This change relocated the A/C pressure switches to the cab however, the chassis changes are not yet available.
Solution
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Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility. |
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| Illustration 1 | g06310481 |
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(3) (A) Engine/Air Conditioning Harness Connector | |
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| Illustration 2 | g06310482 |
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(B) (C) Engine Interface Connector | |
Any engine with
In addition to this change, two extra 16 gage wires will need to be routed from the engine interface connector (left rear of engine) to the jumper harness connection (right front of engine). Refer to Illustration 3 for the jumper wire pin locations.
Note: Engines with the former
Table 1 shows the required parts for this rework procedure.
| Quantity | New Part | Part Name |
|---|---|---|
| 1 | Switch Harness As | |
| 2 | Connector Socket | |
| 2 | Connector Pin |
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| Illustration 3 | g06310371 |
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(1) (2) | |
Illustration 3 shows the proposed field rework. The jumper wires that will need to be installed, connect pins 9 and 10 of the Engine/AC Harness Interface, to pins 21 and 31 of the Engine Interface Connector/Machine Interface Connector.