CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Soil Compactors Machine Systems Vibratory Frequency - Test and Adjust - Fixed Caterpillar


Vibratory Frequency - Test and Adjust - Fixed
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------ WARNING! ------

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.


------ WARNING! ------

Personal injury can result from rotating and moving parts.

Moving fan blades and moving parts will throw or cut any object or tool that falls or is pushed into them.

Make sure no one is working on, underneath or close to an engine that is running. Make sure the area is free of personnel.



NOTICE

In order to avoid damage to the vibratory system during testing, always perform the testing with the vibratory drum on top of tires or on loose dirt. Tires will simulate a non-compacted soil condition

Never operate the vibratory system when the machine is on concrete.



NOTICE

If a testing time longer than three minutes is required, rotate the drum periodically in order to lubricate the eccentric weight shaft bearings.


Table 1
Required Tools 
Tool  Part
Number 
Description  Qty 
A(1)  133-9905  Vibratory Gauge Gp 
133-0963 Vibratory Gauge Gp 
4C-6500  Digital Thermometer 
(1) Use either the frequency meter or the drum vibration tachometer.

  1. Drive the machine to a smooth, horizontal surface on loose, uncompacted soil.

    Note: Vibratory frequency is highly dependent on the temperature of the eccentric bearing. In order to ensure that the temperature of the eccentric bearing is sufficiently high before testing vibratory frequency, you may need to drive the machine for up to 30 minutes with the vibratory function operating.

    Note: If loose, uncompacted soil is unavailable, drive the machine onto an unusable, unmounted tire. Make sure that the the rims are removed and the carcass of the tire is of substantial stiffness in order to support the drum. If tires are used, the drum should be a minimum of 102 mm (4 inch) above the ground.



    Illustration 1g01412481

  2. Move propulsion lever (1) to the NEUTRAL position.


    Illustration 2g01412483

  3. Move parking brake switch (2) to the ON position.


    Illustration 3g01412484

  4. Position throttle switch (3) to the HIGH ENGINE RPM position.

  5. Monitor the hydraulic oil temperature with Tool (B). Operate the machine until the oil temperature reaches 43 ± 5.6 °C (110 ± 10 °F).


    Illustration 4g01415267

  6. Move amplitude selector switch (4) to the LOW AMPLITUDE position.


    Illustration 5g01415270

  7. Actuate vibratory switch (5) on the propulsion lever in order to start the vibratory function.

  8. Read the vibratory frequency on Tool (A). The frequency should be 1965 ± 50 vpm. For CP76, CS76, CP74, and CS74 machines, the frequency should be 1850 ± 50 vpm.

  9. Actuate vibratory switch (5) on the propulsion lever in order to stop the vibratory function.

  10. Move amplitude selector switch (4) to the HIGH AMPLITUDE position.

  11. Actuate vibratory switch (5) on the propulsion lever in order to start the vibratory function.

  12. Read the vibratory frequency on Tool (A). The frequency should be 1965 ± 50 vpm. For CP76, CS76, CP74, and CS74 machines, the frequency should be 1850 ± 50 vpm.

  13. Actuate vibratory switch (5) on the propulsion lever in order to stop the vibratory function.

  14. Move throttle switch (1) to the LOW ENGINE RPM position.


    Illustration 6g01415271

  15. Move engine start switch (6) to the OFF position.

  16. The high amplitude and low amplitude vibratory frequencies that were measured in Step 8 and Step 12 must match within 25 VPM. If the frequency readings were inside the specified range, go to Step 20. If the low amplitude frequency or the high amplitude frequency is outside the specified range, go to Step 17.

    Note: The cab can be tilted in order to provide greater access to components under the cab. However, the cab must be lowered and fastened before the machine is operated. Refer to Disassembly and Assembly, KENR6004, "Cab - Tilt".



    Illustration 7g01415273

  17. Remove bolts (7) and remove right cover plate (8).


    Illustration 8g01415274


    Illustration 9g01415276

  18. Use the following procedure to adjust the vibratory frequency:

    1. Remove the cap from low amplitude adjustment (10) and high amplitude adjustment (9).

    2. Loosen the locknut. Rotate the adjustment screw counterclockwise in order to increase the frequency. Rotate the adjustment screw clockwise in order to decrease the frequency.

    3. Hold the adjustment screw and tighten the locknut.

  19. Move engine start switch (6) to the START position. Release the switch when the engine starts. Go to Step 4.

  20. If necessary, replace cover plate (8). Install bolts (7).

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