BEARING 6I1002 - Caterpillar

Do not check for leaks with your hands. Pin hole (very small) leaks can result in a high velocity oil stream that will be invisible close to the hose. This oil can penetrate the skin and cause personal injury. Use cardboard or paper to locate pin hole leaks.
A visual inspection of the all wheel drive system is the first step in diagnosing a problem. Complete the visual inspections before performing any operation checks. Perform the following visual checks:
Check the hydraulic oil level.
Check for cracks in the hoses or check for wear in the hoses.
Check for cracks in the lines or check for wear in the lines.
Check for flow restrictions such as sharp bends, incorrectly installed clamps, damaged hoses, and damaged lines.
Check for loose connections.
Check for damage to components.
Remove the all wheel drive filter and look for particles that were removed from the oil by the filter. A magnet will separate the ferrous particles from the nonferrous particles. Nonferrous components could include the following components: piston rings, O-ring seals, and gaskets.