BLOCK 5S1986 - Caterpillar

to the following warnings for all inspections and tests of the machine systems. If the source of the problem is not determined, perform the inspections and tests. Perform the inspections and tests in sequential order. For all tests, the oil in the hydraulic system must be at normal operating temperature.
Move the machine to a smooth, horizontal location away from operating machines and away from personnel.Note: Permit only one operator on the machine at a time. Keep all other personnel away from the machine or in the operator sight.
Engage the parking brake. Place blocks around the wheels.
Stop the engine.
Make sure that all of the hydraulic pressure is released before any hydraulic components are altered.During a diagnosis of the hydraulic system, remember that correct oil flow and pressure are necessary for correct operation. The output of the pump (oil flow) increases with an increase in engine speed (rpm) and decreases when engine speed (rpm) is decreased. Oil pressure is caused by resistance to the flow of oil.Before any tests are made, visually inspect the complete hydraulic system for oil leaks and damaged parts. For some of the tests, a magnet and a measuring rule are usable tools.When any test is made of the machine systems, the hydraulic oil must be at the normal temperature for operation.Troubleshooting can be complex. A list of some of the possible problems and corrections is on the following pages.This list of possible problems and possible corrections will only provide an indication of the location of a problem and the repairs that are required. Remember that a problem is not necessarily caused by one part, but by the relation of one part with other parts. This list cannot provide all possible problems and corrections. Service personnel must find the problem and the source of the problem. Then, complete the necessary repairs.Perform a visual inspection first. If the visual checks are completed but the problem has not been identified, perform operational checks. If the problem is not understood, perform instrument tests. This procedure will help to identify problems in the machine systems.