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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, 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 product. 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 on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
Operational Checks
Note: Operate the machine in each direction and in all speeds. Note the noises that are not normal and find the sources of the noises. If the machine is not operating correctly, refer to the list of problems and probable causes below.
Probable Causes of Vibratory System Problems
Problem: Vibration system does not work.
Probable Cause:
- Failure of the solenoid in the vibratory control manifold.
- Failure of the pump drive.
- Fault in vibratory control switches.
Problem: Periodic loss of vibratory system.
Probable Cause:
- Fault in vibratory control switch.
- Loose connection in the electric circuit wiring.
- Intermittent fault vibratory control solenoid coil.
Problem: Harsh engagement of vibratory.
Probable Cause:
- Vibratory relief is set too high.
Problem: Slow vibratory frequency shutdown.
Probable Cause:
- Flow control valve open.
- Main relief valve does not close correctly on the return side of the loop.
Problem: Compactor does not reach maximum vibratory frequency.
Probable Cause:
- Flow control valve not adjusted correctly.
- Gears in pump worn causing excessive leakage from the high-pressure line into the pump housing.
- Adjustment of engine high idle is not correct.
- Gear wear in housing.
- Failure of the vibratory bearings.
Problem: Noisy vibratory mechanism.
Probable Cause:
- Lack of lubrication oil in the vibratory housing.
- Failure of the vibratory drive shaft or components leading up to the vibratory drive shaft.
- Loose retaining bolts for the vibratory motor.
- Failure of vibratory bearings.
Problem: Hydraulic circuit oil overheats.
Probable Cause
- Type of oil used in the hydraulic system not correct.
- Hydraulic oil cooler is restricted.
- Excessive internal leakage in the open circuit.
- Not enough charge line pressure.
- Failure of vibratory shaft bearings which causes extended periods of time over the vibratory pump high-pressure reliefs.
Problem: Maximum VPM is too high.
Probable Cause:
- Flow control valve not adjusted properly.
- Engine RPM is too high.