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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 auxiliary 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, and the 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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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. |
Refer to the following warnings for all inspections and tests of the propel system. 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 propel system must be at normal operating temperature.
- Move the machine to a smooth, horizontal location that is 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 insight of the operator.
- Engage the parking brake. Place chocks around the drums and wheels.
- Stop the engine.
- Make sure that all the hydraulic pressure is released before any hydraulic components are altered.
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). The output of the pump decreases when engine speed (rpm) is decreased. Oil pressure is caused by resistance to the flow of oil.
Visually inspect the complete hydraulic system for oil leaks and damaged parts, before any tests are performed.
The hydraulic oil must be at the normal temperature for operation, before any tests are performed
Troubleshooting can be complex. Some of the possible problems and correction are listed on the following pages.
This list 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.