CORE AS-OIL COOLER 3324188 - Caterpillar

Advantages Of New Repair Procedure
No special tools are required.
The tubes are either installed in one piece, or, if necessary, spliced to eliminate interference with adjacent tubes during installation.
The repair (installation) can be performed from one side of the frame (inside) possibly eliminating removal of some components such as final drives and fuel tanks.Note: This repair procedure is intended as an extra option for repair. Procedure is not intended to replace the method of mechanically rolling tubes in place.Procedure For Tube Replacement
The new procedure uses a smaller collar, like a bushing, that is arc welded to the housing where the tube joins the housing. The collar must be thick enough to be arc welded to the housing but thin enough to provide a stand-off that is long enough to accept silver solder in a relatively short time. These two methods enable you to use arc welding to attach a tube to a large housing (which acts as a heat sink) and silver solder thin tubing to achieve the required fatigue resistance . (See Illustration 3)
Illustration 3 g02173312
Typical Rolled-in joint
Remove the tube or section of the tube that is being replaced. May be necessary to remove the sleeve from the bore. (Note sleeve in Illustration 1.) Since the sleeve is installed into a counterbore, the sleeve must either be collapsed or pushed out of the front side of the bore. The replacement of the sleeve is optional as removal of the component on the front side of the bore may be necessary. See Illustration3 .
Illustration 4 g02173342
Tube repair showing front side of the housing.
Fabricate a collar to be welded to the housing. The Inside of the collar should slip over the tube outside diameter, and have a 4.6 mm (0.18 inch) wall thickness and have a length equal to the tube diameter.
Illustration 5 g02173354
Fabricated collar repair.
Shape the end of the collar to fit flush with the housing surface to permit a good weld joint. Be sure the bore in the housing and the collar are in alignment. Use a short section of tube and sleeve as a guide to determine the shape of the collar. This procedure may eliminate repeated installation and removal of the entire length of tube.
Clean the bore and face of the housing where the tube will be installed. If practical, grind the face of the housing to clean up the area to be welded.
Install the collar on the end of the new tube. Coat the inside of each collar with silver solder flux before assembly.
Install the tube in position in the housing.
Assemble replacement sleeves into the housing counter-bores if needed.
Position the collars flush against the face of the housing.
Tack weld collars to the housing.
Make sure that the tube is not binding to the collars.
Weld the collars and the housing all around to provide an oil tight weld.
Silver solder the tube to the collars.Notes and Precautions
If only one end of the tube is loose or damaged, cut the original tube. Then cut and fit a new tube for length and