FAN HUB & 0068161 - Caterpillar

Repair Procedure
1. Remove the tire from the wheel; then remove the wheel from the machine.2. Remove the drain plug from the 9D114 Wheel Assembly and drain the coolant from the cavity.3. Install an air fitting in place of the drain plug so the wheel assembly can be pressurized (filled with air pressure).4. Put a soap solution on the inside of the hub at the weld joint. Fill the inside of the wheel assembly with air until the pressure is 205 kPa (30 psi). Check for bubbles along the weld joint. These give an indication of cracks.5. If bubbles are present, cut a rectangular inspection opening in the wheel assembly over the area of the weld cracks. The rectangular piece of metal will be welded back in place after the repair is complete.6. Make a V-type groove to remove the cracked weld then weld the joint again as shown in the illustration. Clean the weld slag (debris) off the wheel assembly.7. Weld the rectangular piece of metal over the hole.8. Completely weld around the inside of the wheel assembly where the hubs are joined. See the illustration. This will make the wheel assembly stronger. Clean all weld slag off the wheel assembly.9. Use air pressure with a soap solution to check the new welds on the rectangular inspection opening and on the inside of the hub.10. Put 76 liters (20 U.S. gal) coolant (20% anti-freeze/80% water) into 9D114 Wheel Assembly and install drain plug. Install the tire. The wheel assembly can now be installed on the tractor-scraper.