Usage:
768C, 772B, 776 Tractors;
769C, 773B, 777 Trucks
- SUPPLEMENT: 05/16/83
SERVICE MAGAZINE, APRIL 18, 1983, PAGE 2. In the article "New Oil Cooler Core Can Be Removed For Field Service," change the dimension in the Illustration to 190.5 mm (7.50").
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Reference: "Screen Added To Oil Lines At Inlet Of Brake And Torque Converter Oil Cooler," Service Magazine, September 27, 1982, Page 5."
Description of Change: A new oil cooler core is now used in the brake and torque converter group for the above models. The construction of the new cooler core uses O-ring seals at the junction between the tube bundle and shell assembly, instead of a weld. This permits the tube bundle to be removed for field service.
Adaptable To: The new cooler core is adaptable to the serial numbers shown in the chart.
The 4W294 Oil Cooler Core is adaptable to all earlier machines when the screen and line change modifications are made. These changes are shown in the reference article.
After a period of time, it is possible for any oil cooler to have a leakage problem. To check for leakage in the oil cooler, an air test can be made. Install the 7S8768 Adapter (used only for shipment and test) on the shell assembly end that has one 6V7681 Seal. The adapter prevents pressure loss at the seal and keeps the tube bundle inside the shell during the pressure test. Pressure test the cooler core with a pressure between 620 kPa to 830 kPa (90 to 120 psi).
To remove the tube bundle assembly from the shell assembly, fabricate and use the tool shown in the illustration. It will help prevent damage to the tube bundle during its removal. The illustration shows the tool components and their assembly.
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Use caution so as not to damage the tubes or flange of the bundle assembly after its removal.
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To use the fabricated tool, put the 1W2247 Shell Assembly on its side. Use two 1/2" - 13 by 38 mm (1.5") long bolts to fasten the tool to the end of the cooler (opposite the flange end). Slowly tighten the bolts. The force will push the tube bundle assembly out the other end of the shell assembly.
To install the tube bundle in the shell, use the procedure that follows:
1. Install new O-ring seals in the shell assembly.
2. Put a small amount of the system lubricant on the end of the tube bundle assembly that makes contact with the O-rings in the shell assembly.
3. Install the tube bundle assembly in the shell assembly so that the 4 mm (.16") hole in the end of the bundle assembly is in position over the pin in the face of the shell assembly.
Fabricated tool components.