HEAD 2075076 - Caterpillar

Personal injury or death can result from sudden machine movement.Sudden movement of the machine or release of air pressure or oil pressure can cause injury to persons on or near the machine.To help prevent possible injury before testing and adjusting any air system or hydraulic system, perform the procedure in the Testing and Adjusting, "General Information" section.
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 4C-4890 Hydraulic Test Group, the 8T-5320 Hydraulic Test Group, and the 1U-5481 Pressure Gauge Group are used to perform the pressure test of the hydraulic system. Before any tests are made, visually inspect the complete hydraulic system for leakage of oil and for parts that have damage. For some of the tests, a magnet and a measuring rule are usable tools.Visual checks and measurements are the first troubleshooting step for a possible problem. Then perform the operation checks. Then perform the instrument checks. Lower the bucket to the ground. Stop the engine. In order to remove the hydraulic tank filler cap, press the breaker relief valve. Slowly turn the filler cap until the cap is loose. Perform the following inspections:
Check the hydraulic tank oil level. Slowly turn the filler cap until the cap is loose. If oil escapes, lower the tank pressure. The filler cap can then be removed.
Check for air in the oil. Perform this step immediately after the machine is stopped. Use a clear bottle or a container to collect a sample of oil. Look for air bubbles in the oil that is in the bottle.
Remove the filter elements. Look for particles that have been removed from the oil by the filter element. A magnet will separate ferrous particles from nonferrous particles.
Check all the oil lines and connections for damage or for leaks.
Inspect the control linkage for bent components, for broken components, or for damaged components.