NUT-SPRING 1728591 - Caterpillar

Illustration 1. Location of oil cooler gasket.2. Do an air pressure test. Install the 7S8768 Adapter (used only for shipment and test) on the shell assembly end that has only one O-ring seal. This prevents a pressure loss at the seal and keeps the tube bundle inside the shell during the test. Block off the two oil inlets with tooling as shown in Illustrations 2 and 3. Suggested dealer fabricated tooling for testing oil coolers: 2 - 406 mm (16") C-clamps, 2 - 25.4 mm (1.00") × 25.4 mm (1.00") × 76.2 mm (3.00") V-blocks, 1 - 25.4 mm (1.00") × 76.2 mm (3.00") diameter block with a 90° through hole and quick disconnect fitting. Use other fittings as needed to supply air pressure. Test the cooler core with air pressure. Use 620 kPa to 830 kPa (90 to 120 psi) air pressure for testing.
Illustration 2. Testing for leaks.If leakage is found, the tube bundle can be removed using the fabricated tooling shown in Illustration 4 along with the procedure that follows:
Use caution so as not to damage the tubes or flange of the bundle assembly after its removal.
Illustration 3. Tooling to be fabricated.
Illustration 4. Fabricated tool components.To use the fabricated tool, put the 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.