DOOR GP-ACCESS 2035281 - Caterpillar

inspect the hydraulic system and all of the hydraulic components after a diagnosis of a problem is made. Stop the engine and lower the bowl and the apron. Remove the oil filler cap slowly. If oil comes out of the bleed hole, allow the tank pressure to lower before the filler cap is removed. Make the following inspections.
Measure the oil level.
Look for air in the oil in the hydraulic oil tank immediately after the machine is stopped. Use a clear bottle or a clear container in order to obtain a sample of the oil. Look for air bubbles in the oil that is in the bottle.
Remove the filter element and look for particles in the filter element. A magnet will separate the ferrous particles from the nonferrous particles such as piston rings, O-ring seals, etc..
Check all of the oil lines and connections for damage or leaks.