CS-531D, CP-533D and CS-533D Vibratory Compactors Vibratory System Caterpillar

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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.

Fixed Frequency

High Amplitude

Note: The hydraulic oil temperature should be at least 38°C (100°F).

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Illustration 1	g00610509
Control Console (1) Vibratory on/off control switch. (2) Vibratory amplitude control. (3) Variable vibration control knob.

1. Make sure that the parking brake is applied. Ensure that the propel control lever is in the STOP position.

2. Move vibratory amplitude control (2) to the HIGH AMPLITUDE position.

3. Start the engine and run the engine at high idle. Engine speed should be 2350 ± 50 rpm.

4. Depress vibratory on/off control switch (1) to the ON position in order to start the vibratory system. Record the vibrations per minute (VPM) from the optional gauge on the steering console. The vibrations per minute may be read from 133-0963 Vibration Tachometer or the 133-9905 Frequency Meter. The maximum VPM setting for high amplitude for the CS-533D and the CP-533D should be 1965 ± 50 VPM. The maximum VPM setting for high amplitude for the CS-531D should be 1965 ± 50 VPM.

   Note: Verify the accuracy of the optional gauge on the control panel. Refer to Testing and Adjusting, "Vibratory Tachometer - Adjust".

5. Depress the vibratory on/off control to the OFF position in order to stop the vibratory system.

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Illustration 2	g00457313
Frequency Adjustment (4) High amplitude adjustment screw. (5) Vibratory pump.

6. If the frequency is not correct, adjust high amplitude adjustment screw (4) on pump (5). Loosen the locknut on the adjustment screw (4). Turn high amplitude adjustment screw counterclockwise in order to increase maximum VPM. Turn the adjustment screw clockwise in order to decrease maximum VPM.

Low Amplitude

1. Move vibratory amplitude control (2) to the LOW AMPLITUDE position.

2. Depress vibratory on/off control switch (1) to the ON position in order to start the vibratory system. Read the vibrations per minute (VPM) from optional VPM gauge or read the VPM from the 133-0963 Vibration Tachometer or the 133-9905 Frequency Meter. The maximum VPM for low amplitude is 1965 ± 50 VPM.

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Illustration 3	g00457394
Frequency Adjustment (6) Vibratory pump. (7) Low amplitude adjustment screw.

3. If the frequency is not correct, adjust low amplitude adjustment screw (7). Loosen the locknut on the adjustment screw (7). Turn adjustment screw counterclockwise in order to increase maximum VPM. Turn adjustment screw clockwise in order to decrease maximum VPM.

4. Depress vibratory on/off control switch (1) to the OFF position in order to stop the vibratory system.

Variable Frequency

High Amplitude (Minimum Frequency)

1. Use the 4C-6500 Digital Thermometer in order to verify that the hydraulic oil temperature is at least 38°C (100°F).

2. Position the drum on tires.

3. Apply the parking brake and place the propel control lever in the STOP position.

4. Run the engine at high idle. The engine rpm should be 2350 ± 50 rpm.

5. Place the vibratory amplitude control (2) in the HIGH AMPLITUDE position.

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Illustration 4	g00610509
Control Console (1) Vibratory on/off control switch. (2) Vibratory amplitude control. (3) Variable vibration control knob.

6. Turn variable vibration control knob (3) to the full counterclockwise position.

7. Depress vibratory on/off control switch (1) in order to start the vibratory system. Read the vibrations per minute (VPM) from optional VPM gauge or read the VPM from the 133-0963 Vibration Tachometer or the 133-9905 Frequency Meter. The minimum frequency for high amplitude should be 1400 ± 50 VPM.

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Illustration 5	g00457488
Control Console (8) Variable frequency controller.

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Illustration 6	g00457498
Variable Frequency Controller (8) Variable frequency controller. (9) "P5" Low amplitude-minimum frequency potentiometer. (10) "P6" High amplitude-minimum frequency potentiometer. (11) "P3" Low amplitude-maximum frequency potentiometer. (12) "P4" High amplitude-maximum frequency potentiometer.

8. Depress the vibratory on/off control switch in order to shut off the vibratory system.

   Note: Refer to Testing and Adjusting, "Vibratory Tachometer - Adjust" if the vibration tachometer is installed and the minimum frequency for high amplitude appears incorrect. This adjustment procedure should be followed before making any machine adjustments.

   Note: Adjustment of the vibratory frequency is done through the adjustment of potentiometers which are found by removing the panel on the side of the control console. The potentiometers are located on the variable frequency controller. The adjustment of the potentiometers is done with a small screwdriver.

   Note: Turning the potentiometers clockwise will increase the frequency.

   Note: If the frequency has not shown any variation after rotating the potentiometers for two full turns, refer to the Troubleshooting section.

9. If the minimum frequency for high amplitude is not at 1400 ± 50 VPM, "P6" high amplitude-minimum frequency potentiometer (10) must be adjusted. After adjusting "P6" high amplitude-minimum frequency potentiometer (10), verify that the minimum frequency for high amplitude is correct.

High Amplitude (Maximum Frequency)

1. Turn variable vibration control knob (3) to the full clockwise position.

2. Depress vibratory on/off control switch (1) in order to start the vibratory system. Read the vibrations per minute (VPM) from optional VPM gauge or read the VPM from the 133-0963 Vibration Tachometer or the 133-9905 Frequency Meter. The maximum frequency for high amplitude should be 1965 ± 50 VPM.

3. If the maximum frequency for high amplitude is not at 1965 ± 50 VPM, "P4" high amplitude-minimum frequency potentiometer (10) must be adjusted.

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Illustration 7	g00457569
Vibratory Pump (13) Servo valve neutral adjustment screw.

4. The maximum frequency should be controlled by the electrical signal from the variable frequency controller. If the correct maximum frequency cannot be obtained by adjusting "P4" high amplitude-maximum frequency potentiometer (12), turn servo valve neutral adjustment screw (13) counterclockwise. This will ensure that the movement of the servo piston is not limited.

5. Remove the plastic cover from servo valve neutral adjustment screw (13). Loosen the jam nut arrangement and turn the servo valve neutral adjustment screw counterclockwise for approximately two turns.

6. Repeat Steps 2 through 3. When the correct frequency for high amplitude has been obtained, servo valve neutral adjustment screw (13) should be turned clockwise until the frequency is slightly decreased. Then, servo valve neutral adjustment screw (13) should be rotated counterclockwise for one half turn.

7. Hold the screw and tighten the jam nut arrangement. Install the plastic cover.

Low Amplitude (Minimum Frequency)

1. Place vibratory amplitude control (2) in the LOW AMPLITUDE position.

2. Turn the variable vibration control knob (3) to the full counterclockwise position.

3. Depress vibratory on/off control switch (1) in order to start the vibratory system. Read the vibrations per minute (VPM) from optional VPM gauge or read the VPM from the 133-0963 Vibration Tachometer or the 133-9905 Frequency Meter. The minimum frequency for low amplitude should be 1400 ± 50 VPM.

4. If the minimum frequency for low amplitude is not at 1400 ± 50 VPM, "P5" low amplitude-minimum frequency potentiometer (9) must be adjusted. After adjusting "P5" low amplitude-minimum frequency potentiometer (9), verify that the minimum frequency for low amplitude is correct.

Low Amplitude (Maximum Frequency)

1. Turn variable vibration control knob (3) to the full clockwise position.

2. Depress vibratory on/off control switch (1) in order to start the vibratory system. Read the vibrations per minute (VPM) from optional VPM gauge or read the VPM from the 133-0963 Vibration Tachometer or the 133-9905 Frequency Meter. Depress the vibratory on/off control switch in order to shut off the vibratory system. The maximum frequency for low amplitude should be 1965 ± 50 VPM.

3. If the maximum frequency for low amplitude is not at 1965 ± 50 VPM, "P3" low amplitude-maximum frequency potentiometer (11) must be adjusted.

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Illustration 8	g00457571
Vibratory Pump (14) Servo valve neutral adjustment screw.

4. The maximum frequency should be controlled by the electrical signal from the variable frequency controller. If the correct maximum frequency cannot be obtained by adjusting "P3" low amplitude-maximum frequency potentiometer (11), turn servo valve neutral adjustment screw (14) counterclockwise. This will ensure that the movement of the servo piston is not limited.

5. Remove the plastic cover from servo valve neutral adjustment screw (14). Loosen the jam nut arrangement and turn the servo valve neutral adjustment screw counterclockwise for approximately two turns.

6. Repeat Steps 2 through 3. When the correct maximum frequency for low amplitude has been obtained, servo valve neutral adjustment screw (14) should be turned clockwise until the frequency is slightly decreased. Then, servo valve neutral adjustment screw (14) should be rotated counterclockwise for one half turn.

7. Hold the screw and tighten the jam nut arrangement. Install the plastic cover.

8. When the frequency is correct, stop the engine and remove all tooling.