CP-533 & CS-533 VIBRATORY COMPACTORS VIBRATION SYSTEM Caterpillar


Testing And Adjusting

Usage:

Introduction

Reference: For Specifications with illustrations, refer to the Specifications for the CP-533 & CS-533 Vibration System, Form No.KENR1895. If the Specifications in Form No.KENR1895 are not the same as listed in the Systems Operation and the Testing And Adjusting, look at the print date on the front cover of each book. Use the Specifications listed in the book with the latest date.

Troubleshooting

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.

The 4C4892 ORFS Fittings Group can be used to make pressure tests on the vibration system. Before any tests are made, visually inspect the complete hydraulic system for leakage of oil and for parts that are damaged. For some of the tests a magnet and a mm (in) measuring rule are usable tools.

When any test is made of the vibration system, the hydraulic oil must be at the normal temperature for operation.

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

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, do the procedure that follows before testing and adjusting the vibration system.

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

1. Move the machine to a smooth horizontal location. Move away from working machines and personnel.

2. Permit only one operator on the machine. Keep all other personnel either away from the machine or in view of the operator.

3. Activate the parking brake.

4. Stop the engine.

5. Move the hydraulic control lever to all positions to release any pressure in the hydraulic system.

6. Carefully loosen the filler cap on the hydraulic oil tank to release any pressure in the hydraulic oil tank.

7. Make sure all hydraulic pressure is released before any fitting, hose or component is loosened, tightened, removed or adjusted.

Visual Checks

A visual inspection of the vibration system and its components is the first step when a diagnosis of a problem is made. Then check the operation of the machine. Finally, check the vibration system with instruments. Stop the engine, make the following inspections.

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

Do not check for leaks with your hands. Pin hole (very small) leaks can result in a high velocity oil stream that will be invisible close to the hose. This oil can penetrate the skin and cause personal injury. Use cardboard or paper to locate pin hole leaks.

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

1. Check the oil level of the hydraulic oil tank.

2. Look for air in the oil that is in the hydraulic oil tank. Do this immediately after the machine is stopped. Use a clear bottle or container to get a sample of the oil. Look for air bubbles in the oil that is in the bottle.

3. Check all oil lines, hoses and connections for leaks and damage. Look for oil on the ground under the machine.

4. Remove and check the hydraulic filter element for foreign materials.

a. Bronze-colored particles give an indication of pump port plate failure.
b. Shiny steel particles give an indication of pump or motor piston failure or motor cam deterioration.
c. Rubber particles give an indication of a seal or hose failure.
d. Aluminum particles give an indication of steering pump failure.

Checks During Operation

With the engine running, operate the machine in each direction and from low to high speed. Make note of all noises that are not normal and find their sources. If the operation is not correct, refer to the list of problems and probable causes.

The checks during operation can be used to find leakage in the system. They can also be used to find a bad valve, pump or motor. Vibratory frequency can be used to check the condition of the vibration motors and the pump.

Prior to checking the vibration system, drive the machine backwards and forwards several times operating the propulsion controls in all speed ranges. While the machine is being driven backwards and forwards, check the condition of the rubber blocks. The blocks act as an isolator between vibrating and non-vibrating parts of the machine.

Check for the sound of the relief valves opening. The opening pressures of the relief valves are given in Relief Valve Pressure Tests in Testing And Adjusting.

Problem: Vibration does not work in high or low amplitude.

Probable Cause:

1. Low oil pressure caused by:
a. Low oil level in hydraulic oil tank.
b. Restricted hydraulic filter element.
c. Failure of the steering pump.
d. Charge relief valve adjustment not correct.
e. Failure of the servo control assembly.
f. Failure of the vibration control solenoid valve.
g. Main relief valve setting is not correct or valve does not close.
h. Pump port plate wear causing excessive leakage from the high pressure line into the pump housing.
j. Motor port plate wear.
2. Failure of the engine accessory drive.
3. Faulty vibratory control switch on the console.
4. Faulty vibratory selector switch on the console.

Problem: Periodic loss of vibration in high or low amplitude.

Probable Cause:

1. Faulty vibratory control switch.
2. Faulty vibratory selector switch.
3. Loose connection in the electric circuit wiring.

Problem: Harsh engagement of vibration.

Probable Cause:

1. Charge circuit relief valve is set too high.

Problem: Slow vibration frequency stopping.

Probable Cause:

1. Main relief valve does not close correctly on one side of the closed circuit loop line.

Problem: Compactor will not reach maximum vibration frequency.

Probable Cause:

1. Drum oil level is to high.
2. Engine high idle is not correctly adjusted.
3. Frequency gauge (if equipped) is defective or not correctly adjusted.
4. Failure of the steering pump.
5. Charge relief valve adjustment is not correct.
6. Pump port plate wear causing excessive leakage from the high pressure line into the pump housing.
7. Motor port plate wear.
8. Adjustment of the maximum pump displacement is not correct.
9. Hydraulic oil filter plugged. Charge oil is bypassed to hydraulic oil tank.
10. Failure of the vibratory bearings.
11. Failure of the O-rings for the servo piston assembly.

Problem: Variation in maximum frequency readings between high and low amplitude.

Probable Cause:

1. Incorrect neutral adjustment of the pump servo control assembly.
2. Mechanical failure of the pump servo control assembly.
3. Main relief valve setting is not correct or valve does not close correctly on one side of the loop line.
4. Failure of the pump swashplate assembly.

Problem: Noisy vibratory mechanism.

Probable Cause:

1. Lack of lubrication oil in the vibrator housing.
2. Failure of the vibration drive shaft.
3. Loose retaining bolts for the vibration motor.

Problem: Hydraulic circuit oil overheats.

Probable Cause:

1. Incorrect type of oil used in the hydraulic system.
2. Hydraulic oil cooler is restricted.
3. Excessive internal leakage in the closed circuit.
4. Not enough charge line pressure.
5. Cooling relief valve pressure setting higher than pump charge relief valve pressure setting.

System Tests And Adjustments

Pump Efficiency Check

For any pump test at a given rpm, the pump flow at 690 kPa (100 psi) will be larger than the pump flow at 6900 kPa (1000 psi). The difference between the pump flow of the two operating pressures is the flow loss.

Flow loss when expressed as a percent of pump flow is used as a measure of pump performance.

If the percent of flow loss is more than 10%, pump performance is not good enough.


*The numbers in the examples are for illustration and are not values for any specific pump or pump condition. See Specifications for pump flow of a new pump at 690 kPa (100 psi) and 6900 kPa (1000 psi).

Machine Test

Install a Flow Meter. For Formula I, measure pump flow at 690 kPa (100 psi) and at 6900 kPa (1000 psi) with the engine at high idle rpm.

Bench Test

If the bench test can be run at 6900 kPa (1000 psi) and at full pump rpm, find the percent of flow loss using Formula I.

If the bench test cannot be run at 6900 kPa (1000 psi) and at full pump rpm, run the pump shaft at 1000 rpm. Measure the pump flow at 690 kPa (100 psi) and at 6900 kPa (1000 psi). Use these values in the top part of Formula II. For the bottom part of the formula, run the pump shaft at 2000 rpm. Measure the pump flow at 690 kPa (100 psi).

Pressure Test Tools

Use the above fittings group for all of the pressure tests that follow. In some procedures, more than one of the same pressure gauge is required. It may be necessary to use two fittings groups.

Vibration/Propulsion Pump Charge Relief Valve Pressure Test

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

Make reference to WARNING on first page of Troubleshooting.

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

NOTE: Two different charge pressures are measured on this machine. The procedure described in this test will measure charge pressure when the propulsion control lever is in the STOP position and the vibration system is off. This charge pressure is measured and recorded at the parking brake and speed shift valve. This charge pressure is determined by the three charge pressure reliefs in the vibration pump and the two propulsion pumps.

NOTE: The second charge pressure is measured at the vibration cooling valve. The procedure described in the Cooling Relief Valve Pressure Test measures the charge pressure when the machine is being propelled forward or reverse and/or when the vibration system is in use. This charge pressure setting is lower than the pump charge relief valve pressure setting to allow low pressure oil out of the return side of the closed loop hydraulic circuits to continually flow back to the oil cooler through the vibration and propulsion cooling valve. This allows cooled charge oil to enter the low pressure loop through the makeup check valves of the propulsion and vibration pumps.

NOTE: An improperly set or malfunctioning cooling relief valve in the vibration cooling valve will cause the machine's hydraulic system to overheat.

NOTE: The charge relief valve pressure setting for the two propulsion pumps and the vibration pump can be affected by pump case pressure. For this reason, the pump case pressure must be taken into account when the settings are verified. The following procedure should be used to verify/adjust these charge relief valve settings.


Vibration Cooling Valve
(1) Vibration cooling valve. (2) Oil line.

1. Disconnect oil line (2) from vibration cooling valve (1). Install plugs in the oil line and vibration cooling valve.

NOTE: The charge pressure observed at the brake and speed shift valve can be controlled by the cooling relief valve in the vibration cooling valve. This would be a result of either one or both of the cooling valve shuttle spools being partially shifted. Plugging the hose will void any effect of the cooling relief valve in the vibration cooling valve.


Vibration Pump
(3) Case drain oil line. (4) Vibration pump.

2. Disconnect case drain oil line (3) from vibration pump (4). Install a tee and the 0 to 4000 kPa (0 to 580 psi) pressure gauge from the fittings group on the vibration pump fitting that the case drain oil line was disconnected from. Connect the case drain oil line to the tee. This pressure gauge will measure the vibration pump case pressure.


Hydraulic Oil Filter
(5) Charge pressure test port.

3. Connect a 0 to 4000 kPa (580 psi) pressure gauge to charge pressure test port (5) located near the hydraulic oil filter.

4. Engage the parking brake. Put the propulsion control lever in the STOP position. Start and run the engine at high idle until the hydraulic oil temperature reaches 38°C (100°F). Engine rpm should be 2350 ± 50 rpm.

5. With the propulsion system in neutral and the vibratory system off, record the charge relief pressure on the pressure gauge connected to charge pressure test port (5). Record the vibration pump case pressure from pressure gauge connected to the vibration pump. To determine the charge relief valve setting, subtract the vibration pump case pressure from the reading on the pressure gauge at charge pressure test port (5). The charge relief valve setting (difference) should be 2756 ± 140 kPa (400 ± 20 psi).

EXAMPLE: If the reading at charge pressure test port (6) is 2963 kPa (430 psi) and the vibration pump case pressure is 207 kPa (30 psi), the charge relief valve setting (difference) would be 2756 kPa (400 psi).


NOTICE

A high case pressure reading of greater than 517 kPa (75 psi) may be an indication of high case flow due to a low pressure relief setting or internal leakage. Oil viscosity and temperature will also affect this reading. Case pressures greater than 517 kPa (75 psi) will shorten the pump case seal life.


6. If the charge relief valve pressure is not correct, it must be adjusted. Stop the engine and proceed to Step 7. If the charge relief valve pressure is correct, remove all tooling and connect all hoses.


Vibratory Pump
(6) Vibration pump charge relief valve.


Propulsion Pump
(7) Front (drum) propulsion pump charge relief valve. (8) Rear (axle) propulsion pump charge relief valve.

NOTE: The vibration pump charge relief valve is in the same circuit as the charge relief valves for the propulsion pumps. If the relief valve pressure is not correct, all three charge relief valves need to be checked. Remove each valve and check for damage or debris. If the relief valves are not damaged the valves must be adjusted.

7. Install a tachometer on the engine to measure engine speed. Check to be sure the hydraulic oil temperature reaches 38°C (100°F).

8. To verify and adjust the pressure setting of the charge relief valves, the engine speed (rpm) will need to be varied and the three charge relief valves opened or closed. See the chart below.

NOTE: A flow meter should not be required to perform this procedure. If the desired results are not obtained, a flow meter can be used to verify the pump output.

9. To adjust the charge relief valves, turn front (drum) propulsion pump charge relief valve (7) and rear (axle) propulsion pump charge relief valve (8) in completely. This will allow the shimmable charge relief valve in the vibratory pump to determine system charge pressure.

NOTE: A shim stack height of 11.2 mm (.44 in) should give you approximately 2928 kPa (425 psi) charge pressure.

10. With the engine speed at low idle (800 rpm), determine the pressure difference between the pressure gauge at charge pressure test port (5) and the pressure gauge at the vibration pump. Add shims (to increase pressure) or remove shims (to decrease pressure) to vibration pump charge relief valve (6) to bring the system charge pressure to 2756 ± 140 kPa (400 ± 20 psi). Record the final pressure at charge pressure test port (5) and use this pressure as a reference pressure to set the two propulsion pump charge relief valves.

11. Slowly back out adjustable rear (axle) propulsion pump charge relief valve (8) enough to drop the pressure at charge pressure test port (5) below the reference pressure (approximately three turns). Increase the engine speed to 1575 rpm. Turn the adjustable relief valve until the reference setting in Step 10 is achieved. Tighten the locknut to a torque of 46 to 55 N·m (34 to 41 lb ft).

12. Slowly back out front (drum) propulsion pump charge relief valve (7) enough to drop the pressure at charge pressure test port (6) below the reference pressure (approximately three turns). Increase the engine speed to 2350 rpm (high idle). Turn the adjustable relief valve in or out until the reference pressure is obtained (Step 10). Tighten the locknut to a torque of 46 to 55 N·m (34 to 41 lb ft).

13. Verify the charge relief valve pressure (difference). When the pressure is correct, remove the pressure gauge from the test port at the parking brake and speed shift valve and the tee and pressure gauge from the vibration pump case drain. Connect the hose that was disconnected from the vibration cooling valve.

Cooling Relief Valve Pressure Test

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

Make reference to WARNING on first page of Troubleshooting.

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

NOTE: This charge pressure should be checked while propelling and running the vibration system. For this reason, it is recommended that the test be performed outside in an area clear of obstacles and personnel. The soil should be uncompacted and the hydraulic oil temperature should be 38°C (100°F).

1. Make sure the parking brake is engaged and the propulsion control lever is in the STOP position.


Vibration Cooling Valve
(1) Test port.

2. Connect a hose and a 0 to 4000 kPa (0 to 580 psi) pressure gauge to test port (1) on the vibration cooling valve. The hose should be long enough to allow operation of the machine while performing this test.


Control Panel
(2) Vibratory control switch. (3) Propulsion control lever. (4) Vibratory selector switch. (5) Parking brake switch.

3. Start and run the engine at high idle. Engine rpm should be 2350 ± 50 rpm. The hydraulic oil temperature should be 38°C (100°F).

4. Pull up on parking brake switch (5) to release the parking brake.

5. Move vibratory selector switch (4) to the HIGH AMPLITUDE position.

6. Move propulsion control lever (3) forward to operate the machine in a forward direction and depress vibratory control switch (2) to the ON position to start the vibration system. Make a note of the reading on the pressure gauge. The cooling relief valve setting should be 2400 ± 140 kPa (350 ± 20 psi).

NOTE: If there is not enough area to propel the machine or it is necessary to perform this test inside, this test may be performed with just running the vibration system. It is recommended that the drum be placed on tires to simulate an uncompacted soil condition. In this condition the cooling relief valve pressure setting should be 2200 ± 140 kPa (320 ± 20 psi). The lower pressure is a result of reduced oil flow through the cooling relief valve.


Vibration Cooling Valve
(6) Cooling relief valve.

7. If the cooling relief valve setting is not correct, stop the machine and the engine. Loosen the locknut on cooling relief valve (6) at the vibration cooling valve. Turn the adjustment screw clockwise to increase the pressure or counterclockwise to decrease the pressure. Tighten the locknut and check cooling relief valve pressure setting again.

8. When the pressure setting for the cooling relief valve is correct, remove the gauge from the test port (1).

Main Relief Valve Pressure Test

High Amplitude

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

Make reference to WARNING on first page of Troubleshooting.

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

NOTE: This main relief pressure should be checked while running the vibratory system. For this reason, it is recommended that the drum be placed on tires to simulate an uncompacted soil condition. The hydraulic oil temperature should be 38°C (100°F).

1. Make sure the parking brake is applied, and the propulsion control lever is in the STOP position.


Vibration Cooling Valve
(1) Test port.

2. Connect a 60 000 kPa (8700 psi) pressure gauge to test port (1).


Control Panel
(2) Vibratory control switch. (3) Vibratory selector switch.

3. Move vibratory selector switch (3) to the HIGH AMPLITUDE position.

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

5. Look at the gauge and depress vibratory control switch (2) to the ON position to start the vibration system.

NOTE: The force needed to overcome the inertia of the weights will cause the pressure in the vibration system to momentarily reach the high amplitude relief valve setting. Look at the gauge and turn on the vibration system. The highest reading on the gauge is the high amplitude relief valve setting.

6. The high amplitude relief valve setting for machines with serial numbers 3BL1-UP and 3ZL1-UP should be 24 000 to 28 250 kPa (3500 to 4100 psi).

The high amplitude relief valve setting for machines with serial numbers 4HL1-UP and 5AL1-UP should be 24 800 to 29 625 kPa (3600 to 4300 psi).


Vibration Pump
(4) High amplitude relief valve.

7. If the high amplitude relief valve setting is not correct, high amplitude relief valve (4) must be replaced.

8. When a new high amplitude relief valve is installed, check the pressure setting again. If it is correct, stop the engine and remove all tooling.

Low Amplitude

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

Make reference to WARNING on first page of Troubleshooting.

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

NOTE: This main relief pressure should be checked while running the vibratory system. For this reason, it is recommended that the drum be placed on tires to simulate an uncompacted soil condition. The hydraulic oil temperature should be 38°C (100°F).

1. Make sure the parking brake is applied, and the propulsion control lever is in the STOP position.


Vibration Cooling Valve
(1) Test port.

2. Connect a 60 000 kPa (8700 psi) pressure gauge to test port (1).


Control Panel
(2) Vibratory control switch. (3) Vibratory selector switch.

3. Move vibratory selector switch (3) to the LOW AMPLITUDE position.

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

5. Look at the gauge and depress vibratory control switch (2) to the ON position to start the vibration system.

NOTE: The force needed to overcome the inertia of the weights will cause the pressure in the vibration system to momentarily reach to the low amplitude relief valve setting. Look at the gauge and turn on the vibration system. The highest reading on the gauge is the low amplitude relief valve setting.

6. The low amplitude relief valve setting for machines with serial numbers 3BL1-UP and 3ZL1-UP should be 24 000 to 28 250 kPa (3500 to 4100 psi).

The low amplitude relief valve setting for machines with serial numbers 4HL1-UP and 5AL1-UP should be 24 800 to 29 625 kPa (3600 to 4300 psi).


Vibration Pump
(4) Low amplitude relief valve.

7. If the low amplitude relief valve setting is not correct, low amplitude relief valve (4) must be replaced.

8. When a new low amplitude relief valve is installed, check the pressure setting again. If it is correct, stop the engine and remove all tooling.

Servo Control Neutral Adjustment

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

Make reference to WARNING on first page of Troubleshooting.

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

1. Make sure the parking brake is applied, and the propulsion control lever is in the STOP position.


Vibration Cooling Valve
(1) Test port. (2) Test port.

2. Connect two 60 000 kPa (8700 psi) pressure gauges to test ports (1) and (2).


Vibration Pump
(3) Protective cap. (4) Servo control oil lines.

3. Disconnect servo control oil lines (4) from the vibration pump. Plug and cap the hoses and fittings.

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

5. Look at the 60 000 kPa (8700 psi) pressure gauges. Both readings should be the same and should be approximately the same as the charge pressure.

6. If it is necessary to adjust the neutral position of the servo piston, remove protective cap (3). Loosen the locknut and turn the adjustment screw to get the same pressure reading on each gauge.

7. Stop the engine. Remove the two 60 000 kPa (8700 psi) pressure gauges and replace them with two 4000 kPa (580 psi) pressure gauges.

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

9. Turn the adjustment screw until both pressure gauge readings are the same. Turn the adjustment screw clockwise until one of the pressure readings starts to increase. Note the position of the adjustment screw.

10. Now turn the adjustment screw counterclockwise until the reading on the other pressure gauge begins to increase. Note the position of the adjustment screw. Turn the adjustment screw clockwise one-half the distance to the first adjustment screw position.

11. Hold the adjustment screw and tighten the locknut to a torque of 18 to 24 N·m (13 to 18 lb ft). Install protective cap (3).

12. Stop the engine. Remove the pressure gauges from the test ports.

13. Install servo control oil lines (4) on the vibration pump.

Vibratory Frequency Test

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

Make reference to WARNING on first page of Troubleshooting.

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

NOTE: Tests should be performed on tires or loose dirt. Tires are recommended. Never operate the vibration system when the machine is on concrete.

NOTE: The oil in the system must be SAE 10W hydraulic oil. The oil temperature must be 38°C (100°F) to get correct results. The vibratory frequency should be measured after the vibration system has run for 15 minutes.

NOTE: If the machine is equipped with the optional vibrations per minute (vpm) gauge, the 773904 Vibration Tachometer should be used to verify the vibrations per minute (vpm) gauge reading.

1. Make sure the parking brake is applied and the propulsion control lever is in the STOP position.


Control Panel
(1) Vibratory control switch. (2) Vibratory selector switch.

2. Move vibratory selector switch (2) to the HIGH AMPLITUDE position.

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


Gauge Panel
(3) Vibrations per minute (vpm) gauge (optional).

4. Depress vibratory control switch (1) to the ON position to start the vibration system. Read the vibrations per minute (vpm) from optional gauge (3) and/or read the vpm from the 773904 vibration tachometer. The maximum vpm setting for high amplitude should be 1875 ± 25 vpm.

5. Depress the vibratory control switch to the OFF position to stop the vibration system. If the maximum vpm setting is not correct, the high amplitude limiter on the vibration pump servo must be adjusted.


Vibration Pump
(4) High amplitude limiter. (5) Vibration pump. (6) Low amplitude limiter.

6. To adjust the maximum vpm setting for high amplitude, adjust high amplitude limiter (4) on the servo of vibration pump (5).

7. Hold the adjustment screw in place with a screwdriver and loosen the locknut. To decrease the number of vibrations per minute (vpm), turn the adjustment screw clockwise. To increase the number of vibrations per minute (vpm), turn the adjustment screw counterclockwise. Hold the adjustment screw and tighten the locknut to a torque of 5.4 to 9.5 N·m (48 to 84 lb in).


Control Panel
(1) Vibratory control switch. (2) Vibratory selector switch.

8. Move vibratory selector switch (2) to the LOW AMPLITUDE position.

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


Gauge Panel
(3) Vibrations per minute (vpm) gauge (optional).

10. Depress vibratory control switch (1) to the ON position to start the vibration system. Read the vibrations per minute (vpm) from optional gauge (3) and/or read the vpm from the 773904 vibration tachometer. The maximum vpm setting for low amplitude should be 1875 ± 25 vpm.

11. Depress the vibratory control switch to the OFF position to stop the vibration system. If the maximum vpm setting is not correct, the low amplitude limiter on the vibration pump servo must be adjusted.


Vibration Pump
(4) High amplitude limiter. (5) Vibration pump. (6) Low amplitude limiter.

12. To adjust the maximum vpm setting for low amplitude, adjust low amplitude limiter (6) on the servo of vibration pump (5).

13. Hold the adjustment screw in place with a screwdriver and loosen the locknut. To decrease the number of vibrations per minute (vpm), turn the adjustment screw clockwise. To increase the number of vibrations per minute (vpm), turn the adjustment screw counterclockwise. Hold the adjustment screw and tighten the locknut to a torque of 5.4 to 9.5 N·m (48 to 84 lb in).

Vibration Pump Case Pressure Test

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

Make reference to WARNING on first page of Troubleshooting.

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

NOTE: The oil in the system must be SAE 10W hydraulic oil. The oil temperature must be 38°C (100°F) to get correct results.


Vibration Cooling Valve
(1) Vibration cooling valve. (2) Oil line.

1. Disconnect oil line (2) from vibration cooling valve (1). Install plugs in the oil line and vibration cooling valve.


Vibration Pump
(3) Case drain oil line. (4) Vibration pump.

2. Disconnect case drain oil line (3) from vibration pump (4). Install a tee and the 0 to 4000 kPa (0 to 580 psi) pressure gauge from the fittings group on the vibration pump fitting that the case drain oil line was disconnected from. Connect the case drain oil line to the tee. This gauge will measure the vibration pump case pressure.

3. Start and run the engine at high idle until the hydraulic oil temperature reaches 38°C (100°F). Engine rpm should be 2350 ± 50 rpm.

4. Record the case drain pressure for the vibration pump. The case drain pressure should be 380 ± 70 kPa (55 ± 10 psi).

5. If the case drain pressure for the vibration pump is correct, stop the engine. Remove the pressure gauge and tee from the vibration pump and case drain oil line. Connect case drain oil line (3) to vibration pump (4).

6. Remove the plugs from vibration cooling valve (1) and oil line (2), and connect the oil line to the vibration cooling valve.

7. If the case drain pressure for the vibration pump is not correct, first perform the Vibration Motor Case Leakage Test. If the amount of internal leakage for the vibration motor is acceptable, perform the Pump Efficiency Check for the vibration pump.

Propulsion Pump Case Pressure Test

Front Propulsion Pump

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

Refer to the WARNING on the first page of Troubleshooting.

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

NOTE: The oil in the system be SAE 10W hydraulic oil. The oil temperature must be 38°C (100°F) to get the correct results.


Vibration Cooling Valve
(1) Vibration cooling valve. (2) Oil line.

1. Disconnect oil line (2) from vibration cooling valve (1). Install plugs in the oil line and vibration cooling valve.


Front Propulsion Pump
(3) Front propulsion pump. (4) Case drain line.

2. Disconnect case drain line (4) from front propulsion pump (3). Install a tee in the front propulsion pump and connect the front propulsion pump case drain line back up. Connect a 0 to 4000 kPa (0 to 580 psi) pressure gauge to the tee also. This pressure gauge will measure the front propulsion pump case pressure.

3. Start and run the engine at high idle until the hydraulic oil temperature reaches 38°C (100°F). Engine rpm should be 2350 ± 50 rpm.

4. Record the case drain pressure for the front propulsion pump. The case drain pressure should be 415 ± 70 kPa (60 ± 10 psi).

5. If the case drain pressure for the front propulsion pump is correct, stop the engine. Remove the pressure gauge and tee from the front propulsion pump and the case drain line.

6. If the case drain pressure for the front propulsion pump is not correct perform the front propulsion motor case leakage test.

7. If the case drain pressure for the front propulsion motor is acceptable, perform the pump efficiency check for the front propulsion pump.

Rear Propulsion Pump

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

Refer to the WARNING on the first page of Troubleshooting.

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

NOTE: The oil in the system be SAE 10W hydraulic oil. The oil temperature must be 38°C (100°F) to get the correct results.


Vibration Cooling Valve
(1) Vibration cooling valve. (2) Oil line.

1. Disconnect oil line (2) from vibration cooling valve (1). Install plugs in the oil line and vibration cooling valve.


Rear Propulsion Pump
(3) Rear propulsion pump. (4) Case drain line.

2. Disconnect case drain line (4) from rear propulsion pump (3). Install a tee in the rear propulsion pump and connect the case drain line back up. Connect a 0 to 4000 kPa (0 to 580 psi) pressure gauge to the tee also. This pressure gauge will measure the rear propulsion pump case pressure.

3. Start and run the engine at high idle until the hydraulic oil temperature reaches 38°C (100°F). Engine rpm should be 2350 ± 50 rpm.

4. Record the case drain pressure for the rear propulsion pump. The case drain pressure should be 345 ± 70 kPa (50 ± 10 psi).

5. If the case drain pressure for the rear propulsion pump is correct, stop the engine. Remove the pressure gauge and tee from the rear propulsion pump and the case drain line.

6. If the case drain pressure for the rear propulsion pump is not correct perform the rear propulsion motor case leakage test.

7. If the case drain pressure for the rear propulsion motor is acceptable, perform the pump efficiency check for the rear propulsion pump.

Vibration Amplitude Valve Coil Resistance Procedure

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

Make reference to WARNING on first page of Troubleshooting.

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

1. Disconnect the negative battery cable from the negative (-) battery terminal.

2. Disconnect the wire connector for the vibration amplitude valve.


End View Of Wire Connector From Vibration Amplitude Valve
(1) Low amplitude energized pin. (2) High amplitude energized pin. (3) Ground pin. (4) Ground pin.


Measuring Resistance Of High Amplitude Coil
(5) Multimeter. (6) Vibration Amplitude Valve. (7) High amplitude coil.

3. Connect one of the leads from multimeter (5) to high amplitude energized pin (2). Connect the remaining multimeter lead to ground pin (3).

4. Measure the resistance across two the pins. Resistance for high amplitude coil (7) should be 39.3 ± 2 ohms.


Measuring Resistance Of Low Amplitude Coil
(5) Multimeter. (6) Vibration Amplitude Valve. (8) Low amplitude coil.

5. Connect one of the leads from multimeter (5) to low amplitude energized pin (1). Connect the remaining multimeter lead to ground pin (4).

6. Measure the resistance across two the pins. Resistance for the low amplitude coil should be 39.3 ± 2 ohms.

7. If either resistance reading is not correct, replacement of the coil is necessary.


Measuring Resistance Between High Amplitude Coil And Ground
(5) Multimeter. (6) Vibration Amplitude Valve. (7) High amplitude coil.

8. Connect one of the leads of multimeter (5) to high amplitude energized pin (2) and the other multimeter lead to an electrical ground.

9. Measure the resistance between high amplitude pin (2) and the electrical ground. The multimeter should read OL (open limit).


Measuring Resistance Between Low Amplitude Coil And Ground
(5) Multimeter. (6) Vibration Amplitude Valve. (8) Low amplitude coil.

10. Connect one of the leads of multimeter (5) to low amplitude energized pin (1) and the other multimeter lead to an electrical ground.

11. Measure the resistance between low amplitude pin (1) and the electrical ground. The multimeter should read OL (open limit).

12. If the multimeter readings are not correct, the coil(s) should be replaced.

13. After the tests and/or repairs are completed, remove the multimeter leads from the vibration amplitude valve coils.

14. Connect the wire connector to the vibration amplitude valve.

15. Connect the negative battery cable to the negative (-) battery terminal.

Vibration Motor Case Leakage Test

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

Make reference to WARNING on first page of Troubleshooting.

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

NOTE: Tests should be performed on tires or loose dirt. Tires are recommended. Never operate the vibration system when the machine is on concrete.

NOTE: The oil in the system must be SAE 10W hydraulic oil. The oil temperature must be 38°C (100°F) to get correct results.

1. Make sure the parking brake is applied and the propulsion control lever is in the STOP position. Make sure the vibratory control switch on the propulsion control lever is in the OFF position.


Vibration Motor
(1) Vibration motor. (2) Case drain hose to hydraulic tank. (3) Case drain hose from vibration pump.

2. Disconnect hoses (2) and (3) from vibration motor (1). Use a union to connect the hoses together. Connect hoses to the fittings from which hoses (2) and (3) were removed. Put the other end of the hoses in a 19 liter (5 U.S. Gallons) container.

3. Move the vibratory selector switch to the HIGH AMPLITUDE position.

4. Start and run the engine at high idle until the hydraulic oil temperature reaches 38°C (100°F). Engine rpm should be 2350 ± 50 rpm.

5. Depress the vibratory control switch to the ON position to start the vibration system. At the same time the switch is depressed, move the hoses to a second 19 liter (5 U.S. Gallons) container. At the end of one minute, move the hoses back to the first container.

6. Depress the vibratory control switch to the OFF position to stop the vibration system. Stop the engine.

7. Measure the amount of oil in the second container. If there is more than 4 liters (1 U.S. Gallons), the vibration motor has too much internal leakage and must be repaired or replaced.

8. Remove all test tooling and connect hoses (2) and (3) to vibration motor (1).

Caterpillar Information System:

CP-533 & CS-533 VIBRATORY COMPACTORS VIBRATION SYSTEM Systems Operation
CP-533 & CS-533 VIBRATORY COMPACTORS VIBRATION SYSTEM Drum Assembly
CP-533 & CS-533 VIBRATORY COMPACTORS VIBRATION SYSTEM Gearbox Tightening Procedure For Gearbox Spanner Nut
CP-533 & CS-533 VIBRATORY COMPACTORS VIBRATION SYSTEM Vibration Motor
CP-533 & CS-533 VIBRATORY COMPACTORS VIBRATION SYSTEM Vibration Cooling Valve
CP-533 & CS-533 VIBRATORY COMPACTORS VIBRATION SYSTEM Vibration Amplitude Valve
CP-533 & CS-533 VIBRATORY COMPACTORS VIBRATION SYSTEM Pump Group
CP-533 & CS-533 VIBRATORY COMPACTORS VIBRATION SYSTEM Introduction
CP-533 & CS-533 VIBRATORY COMPACTORS PROPULSION SYSTEM Testing And Adjusting
CP-533 & CS-533 VIBRATORY COMPACTORS PROPULSION SYSTEM Systems Operation
CP-533 CS-533 VIBRATORY COMPACTORS PROPULSION SYSTEM Gearbox Group
CP-533 CS-533 VIBRATORY COMPACTORS PROPULSION SYSTEM Rear Axle Assembly
CP-533 & CS0533 VIBRATORY COMPACTORS STEERING SYSTEM Specifications
CP-533 & CS0533 VIBRATORY COMPACTORS STEERING SYSTEM Systems Operation
CP-533 & CS0533 VIBRATORY COMPACTORS STEERING SYSTEM Testing And Adjusting
CP-533 & CS-533 VIBRATORY COMPACTORS HYDRAULIC SYSTEM Schematic
CP-533 & CS-533 VIBRATORY COMPACTOR MACHINE SYSTEMS Operator Platform
CP-533 & CS-533 VIBRATORY COMPACTOR MACHINE SYSTEMS Hood
CP-533 & CS-533 VIBRATORY COMPACTOR MACHINE SYSTEMS Battery
CP-533 & CS-533 VIBRATORY COMPACTOR MACHINE SYSTEMS Fuel Tank
CP-533 & CS-533 VIBRATORY COMPACTOR MACHINE SYSTEMS Steering Frame Lock
CP-533 & CS-533 VIBRATORY COMPACTOR MACHINE SYSTEMS Steering Pump
CP-533 & CS-533 VIBRATORY COMPACTOR MACHINE SYSTEMS Steering Wheel
CP-533 & CS-533 VIBRATORY COMPACTOR MACHINE SYSTEMS Propel Pumps
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