PLUG AS 3092995 - Caterpillar

Personal injury or death can result from improperly checking for a leak.Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing serious injury, and possible death.If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
The 8T-5320 Hydraulic Test Group or the 1U-5481 Pressure Gauge Group can be used in order to test the hydraulic system pressure. Before any tests are performed, visually inspect the entire hydraulic system for oil leaks and for damaged parts. For some of the tests, a magnet and a measuring rule (millimeters or inches) are usable tools.When any test is made to the steering hydraulic system, the hydraulic oil must be at the normal temperature for operation. To increase the oil temperature, start the machine. Lift the bucket and turn the machine in both directions.A visual inspection of the steering system and components is the first step in diagnosing a problem. Stop the engine. Lower the bucket to the ground. Make the following inspections:
Personal injury can result from removing the hydraulic tank filler cap too fast. Hot oil under pressure can cause burns.Slowly loosen the hydraulic tank filler cap to release the pressure in the tank before installing or removing any test equipment.
Illustration 1 g03880031
(1) Hydraulic tank
Check the hydraulic tank oil level by looking at the sight gauge.
Look for air in the oil that is in the tank immediately after the machine is stopped. A clear bottle or a clear container should be used. Obtain a sample of oil from the hydraulic tank for the steering and brake systems. Check for bubbles of air in the oil sample.
Remove the hydraulic oil filter and cut the filter open with a filter cutter. Look for particles in the filter elements. A magnet will separate ferrous particles such as iron and steel from the nonferrous particles such as aluminum and rubber.
Inspect all of the oil lines and hydraulic connections for damage or for leaks.
Inspect all of the control linkages for damage.