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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.
Check the vibration of the Drum.
- Watch the drum. The drum should start rapidly. The drum should stop rapidly. Drum rotation should be smooth and regular.
- The vibratory system should only start when the vibratory control is in the ON position.
- Check that the drums stop when the vibratory control is turned to the OFF position. The drum should stop 2 to 4 seconds after the vibratory control is turned off.
- Check for noise from the vibratory pump. Check for noise from the vibratory motor.
Probable Causes of Vibratory System Problems
Problem
The vibration system does not work in forward travel or reverse travel.
Probable causes
- The hydraulic oil level is low.
- There is a restriction in the suction strainer.
- Low charge oil pressure.
- The vibratory valve is not functioning properly.
- The vibratory solenoid valves are not functioning properly.
- The main relief valve needs adjustment.
- The vibratory pump is not operating correctly.
- The vibratory motor is not operating correctly.
- The vibratory "ON/OFF" control is not operating correctly.
- The eccentric weight is not functioning properly.
- There is a fault in the electrical wiring.
Problem
There is periodic loss of vibration.
Probable Cause
- There is a loose connection in the electric circuit wiring.
- The vibratory on/off control is faulty.
Problem
The engagement of vibration system is harsh.
Probable Cause
- The relief valve for the vibratory valve is set too high.
Problem
The start of the vibration is slow.
Probable Cause
- The solenoid valves are not functioning properly.
- The vibratory control is not functioning properly.
- The main relief valve on the vibratory valve is set too low.
- The engine speed is low.
Problem
Slow stop of the vibration.
Probable Cause
- The solenoid valves are not functioning properly.
- The vibratory control is not functioning properly.
- The relief valve does not close completely on the return side circuit.
Problem
The machine will not reach maximum vibration frequency.
Probable Cause
- Engine high idle is not correctly adjusted.
- The pressure for the main relief valve is set too low.
- The oil level in the eccentric weight housing is too high.
- The vibratory motor is not functioning properly.
- The vibratory pump is not functioning properly.
- The vibratory bearings have failed.
- The solenoid valves are not completely closed.
Problem
The vibratory mechanism is noisy.
Probable Cause
- The lubrication oil in the vibratory housing is low.
- Loose retaining bolts for the vibratory motor.
- The vibratory bearings have failed.
Problem
The hydraulic oil in the circuit overheats.
Probable Cause
- The hydraulic cooler and/or the radiator is restricted.
- An incorrect type of oil is used in the hydraulic system.
- The pressure for the main relief valve is set too low.
- The vibratory bearings have failed.
Problem
The machine will only vibrate in dual drum vibration mode.
Probable Cause
- The solenoid is not operating correctly.
- There is a failure in the vibratory control valve.
- There is a failure in the vibratory control switch.
Problem
The machine will only operate in single drum vibration mode.
Probable Cause
- The solenoid is not operating correctly.
- There is a failure in the vibratory control valve.
- There is a failure in the vibratory control switch.
Vibratory Electrical Circuit
The vibratory system is engaged by pressing the ON/OFF control switch (button) on the propel control lever.
Problem
The vibratory system does not engage.
Probable Cause
- The vibratory fuse is open.
- The vibratory ON/OFF control has failed.
- A vibratory control solenoid has failed.
- An open circuit exists in the harness for the vibratory system.