TUBE AS. 2057992 - 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 machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines.Dispose of all fluids according to local regulations and mandates.
When any test is made, 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 is the first step in diagnosing a problem. Stop the engine. Lower the bucket to the ground. Make the following inspections:
Escaping fluid under pressure, even a pinhole 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.Always use a board or cardboard when checking for a leak.
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.
Check the hydraulic tank oil level by looking at the sight gauge.
Look for air in the oil that is in the tank. This should be done 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 filter elements. Check the filter elements for particles that were removed from the oil by the filter elements. A magnet can be used to separate the ferrous particles (metallic particles) from the nonferrous particles (nonmetallic particles).
Inspect all of the oil lines and hydraulic connections for damage or for leaks.
Check the oil level in the differentials.
A leaking transmission oil cooler may cause coolant to enter the system. Water may enter the system if the filler cap or the dipstick is not properly installed.
The drive shafts and universal joints must rotate freely unless cold oil is causing a resistance. If the drive shafts do not turn freely, disconnect the drive shafts and check that the transmission will turn.