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Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system. |
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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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When you are analyzing a hydraulic system or a steering system for poor performance, remember that correct oil flow and correct oil pressure are necessary for correct operation. Oil flow is a function of the pump output. The pump output is a function of engine speed. A restriction to the flow of oil causes oil pressure.
Before any tests are performed, visually inspect the complete hydraulic system for oil leaks and for damaged parts. Refer to Testing and Adjusting, "Visual Inspection" for further information on visual inspection. For some of the tests, a magnet and a measuring rule (inches or millimeters) may be used.
When any test is made to the hydraulic system or to the steering system, the hydraulic oil must be at normal temperature for operation. In order to increase the oil temperature, start the engine. Raise and lower the attachment. Turn the steering wheel in both directions.
Perform the proper Testing and Adjusting, "Hydraulic System Pressure - Release" procedure for your specific type of machine.
Note: When a component is removed, an identification mark should be put on all of the following items: lines, hoses, wires and tubes. Identification marks will help with the installation process. Plug all lines, all hoses and all tubes. This helps to prevent fluid loss and this helps to keep contaminants from entering the system.