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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause 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. |
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Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth, level surface. Lower the bucket and/or attachments to the ground and engage the parking brake. Stop the engine and remove the key. Block the wheels and install the steering frame lock. |
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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. |
The 5S-5123 Hydraulic Test Group, 8T-5320 Hydraulic Test Group or the 1U-5481 Pressure Gauge Group can be used 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 performed on the hydraulic system, the hydraulic oil must be at the normal operating temperature. To increase the oil temperature, start the engine and turn the machine in both directions. Also, raise the bucket and/or attachment and lower the bucket and/or attachment.
When you diagnose a problem in the hydraulic system, a visual inspection of the hydraulic system is the first step. Stop the engine and lower the bucket and/or attachment to the ground. Perform the following inspections:
- Check the oil level in the sight gauge.
- Look for air in the hydraulic tank oil immediately after the engine is stopped. Use a clear container to obtain a sample of the oil. Look for air bubbles in the oil in the container.
Note: The sampling valve for hydraulic tank oil is located on the right side of the machine behind the hydraulic tank.
- Remove the filter elements and 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.
- Check all oil lines and all connections for damage and for leaks.
- Inspect all of the control linkages for damage.