| Required Tools | ||
| Part Number | Description | Qty |
| 4C-6500 | Digital Thermometer | 1 |
| 4C-4892 | ORFS Fittings Group | 1 |
| 9U-7400 | Multitach | 1 |
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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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| NOTICE |
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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. |
| NOTICE |
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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 |
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If a testing time longer than three (3) minutes is required, rotate the drum periodically in order to lubricate the eccentric weight shaft bearings. |
Note: The hydraulic oil temperature should be at least 38°C (100°F).
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| Illustration 1 | g00461656 |
Vibratory Pump (1) Test port. | |
High Amplitude
- Make sure that the parking brake is applied. Ensure that the propel control lever is in the STOP position.
- Connect a 60000 kPa (8700 psi) pressure gauge to relief valve test port (1) .
- Move amplitude selector (2) to the HIGH AMPLITUDE position.
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| Illustration 2 | g00610475 |
Control Console (2) Vibratory amplitude control. (3) Vibratory ON/OFF control. | |
- Install the Multitach in order to measure engine rpm. Install 4C-6500 Digital Thermometer into the hydraulic oil tank. Start the machine and run the machine at high idle (2350 ± 50 RPM) until the hydraulic oil temperature reaches 38°C (100°F).
- Look at the gauge and depress vibratory control switch (3) to the ON position in order to start the vibratory system.
Note: The force that is needed to overcome the inertia of the weights causes 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.
- The high amplitude relief valve setting should be 35000 ± 3000 kPa (5076 ± 435 psi).
- If the high amplitude relief valve setting is not correct, high amplitude relief valve (4) must be adjusted.
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| Illustration 3 | g00461659 |
Vibratory Pump (4) High amplitude relief valve. | |
- Adjust high amplitude relief valve (4) in the following steps:
- Stop the engine.
- Remove the cap of high amplitude relief valve (4) .
- Remove the high pressure relief valve cartridge. Install the cap of high pressure relief valve (4). This will ensure that the oil does not leak while adjustments are made to the cartridge and the spring.
- Hold the high pressure relief valve cartridge in a bench vise. Secure the high pressure relief valve cartridge by clamping on collar (6).
- Loosen lock screw (7) with a 3 mm Allen wrench.
- Use a 5 mm wrench and adjust the pressure by turning spindle (5). Turn the spindle clockwise in order to increase the pressure. Turn the spindle counterclockwise in order to decrease the pressure. One full rotation of spindle (5) equals 4400 kPa (638 psi).
- Tighten lock screw (7) .
- Remove the high pressure relief valve from the vise.
- Reinstall the high pressure relief valve cartridge. Install the cap of high pressure relief valve (4) and torque to specifications.
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| Illustration 4 | g00461655 |
Relief Valve Cartridge (5) Spindle. (6) Collar. (7) Lock screw. | |
- Repeat Step 5.
- Stop the engine.
Note: After five minutes of operation, when the drum is on tires, the vibratory operating pressure should decrease to a maximum of 10340 kPa (1500 psi). If continued high pressure is observed, a problem may exist with the vibratory drive mechanism.
Low Amplitude
- Make sure that the parking brake is applied. Ensure that the propel control lever is in the STOP position.
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| Illustration 5 | g00461662 |
Vibratory Pump (8) Test port. | |
- Connect a 60000 kPa (8700 psi) pressure gauge to relief valve test port (8) .
- Move vibratory amplitude control (2) to the LOW AMPLITUDE position.
| | |
| Illustration 6 | g00610475 |
Control Console (2) Vibratory amplitude control. (3) Vibratory ON/OFF control. | |
- Install the Multitach in order to measure the engine rpm. Install 4C-6500 Digital Thermometer into the hydraulic oil tank. Start the machine and run the machine at high idle (2350 ± 50 RPM) until the hydraulic oil temperature reaches 38°C (100°F).
- Look at the gauge and depress vibratory on/off control (3) to the ON position in order to start the vibratory system.
Note: The force that is needed to overcome the inertia of the weights causes the pressure in the vibration system to momentarily reach 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.
- The low amplitude relief valve setting should be 35000 ± 3000 kPa (5076 ± 435 psi).
- If the low amplitude relief valve setting is not correct, low amplitude relief valve (9) must be adjusted.
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| Illustration 7 | g00461663 |
Vibratory Pump (9) Low amplitude relief valve. | |
- Adjust low amplitude relief valve (9) in the following steps:
- Stop the engine.
- Remove the cap of high amplitude relief valve (4) .
- Remove the high pressure relief valve cartridge. Install the cap of high pressure relief valve (4). This will prevent oil leakage while adjustments are made to the cartridge and the spring.
- Hold the high pressure relief valve cartridge in a bench vise. Secure the high pressure relief valve cartridge by clamping on collar (6).
- Loosen lock screw (7) with a 3 mm Allen wrench.
- Use a 5 mm wrench and adjust the pressure by turning spindle (5). Turn the spindle clockwise in order to increase the pressure. Turn the spindle counterclockwise in order to decrease the pressure. One full rotation of spindle (5) equals 4400 kPa (638 psi).
- Tighten lock screw (7) .
- Remove the high pressure relief valve from the vise.
- Reinstall the high pressure relief valve cartridge. Install the cap of high pressure relief valve (4) and torque to specifications.
| | |
| Illustration 8 | g00461655 |
Relief Valve Cartridge (5) Spindle. (6) Collar. (7) Lock screw. | |
- Repeat Step 5.
- Stop the engine.
Note: After five minutes of operation, when the drum is on tires, the vibratory operating pressure should decrease to a maximum of 10340 kPa (1500 psi). If continued high pressure is observed, a problem may exist with the vibratory drive mechanism.