CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Machine Preparation for Troubleshooting Caterpillar

Machine Preparation for Troubleshooting

Refer 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.

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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manual. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your AVSpare dealer for replacement manuals. Proper care is your responsibility.

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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing 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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Personal injury can result from rotating and moving parts. Stay clear of all rotating and moving parts.

Never attempt adjustments while the machine is moving or the engine is running unless otherwise specified.

The machine must be parked on a level surface and the engine stopped.

Attach a "Do Not Operate" or similar warning tag to the start switch and controls before servicing, repairing, or making adjustments to the machine.

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Personal injury or death can result from sudden machine movement.

Sudden movement of the machine can cause injury to persons on or near the machine.

To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

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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.


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, "AVSpare Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in AVSpare machines.

Dispose of all fluids according to local regulations and mandates.

  1. 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's sight.

  2. Engage the steering lock pin.

  3. Engage the parking brake.

  4. Stop the engine.

  5. Place blocks around the wheels.

  6. 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 can not 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.