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What Causes Shaking When Extending the Boom of a Truck-Mounted Crane?

The crane on a truck-mounted crane is a crucial component, and any issues with it can significantly affect the crane’s performance. One common issue is shaking during the boom extension. What causes this shaking, and how can it be resolved? Let’s explore the possible reasons:

1. Clogged Damping Hole in the Balance Valve

The extension circuit of the boom is equipped with a balance valve. If the damping hole in the balance valve becomes clogged, it will affect the valve’s performance, causing the boom to shake during extension. Solution: Disassemble the balance valve, clean it, and unclog the damping hole to resolve the issue.

2. Air in the Hydraulic Cylinder

Air entering the hydraulic system due to a low hydraulic oil level or leakage in the hydraulic circuit can increase the oil’s elasticity and reduce the stiffness of the hydraulic transmission, leading to shocks and crawling in the extension cylinder. This results in shaking during boom extension. Solution: Identify and fix the source of air entry in the hydraulic circuit, then bleed the air from the system.

3. Excessive Friction During Extension

If the friction is too high during boom extension, it can cause sudden pressure fluctuations in the system, resulting in hydraulic shocks and shaking. If the boom slider is severely worn, the boom may tilt downward, increasing the shaking. Solution: Replace the worn slider and adjust the gap between the boom and the slider to the specified value. When adjusting with no load, ensure the boom has a slight upward tilt to compensate for the downward deflection under load, which helps avoid shaking.

4. Loose Boom Extension Wire Rope

A loose wire rope for boom extension can cause the boom to shake. Solution: Inspect the wire rope’s length and tension to ensure it meets the required specifications. Also, check the lubrication and wear condition of the extension and retraction pulleys, adding grease or replacing the pulley bushing if necessary.

5. Poor Hydraulic Cylinder or Boom Manufacturing Process

Shaking may occur if there are large tolerance variations between components in the hydraulic cylinder, or if the boom’s manufacturing quality is subpar, causing a mismatch between the boom and extension cylinder. Solution: Replace the hydraulic cylinder or ensure strict quality control during the manufacturing process.

6. Poor Lubrication of Boom Slider and Lubrication Channels

Insufficient lubrication of the boom slider and lubrication channels can also lead to shaking during extension. Solution: Regularly inspect the lubrication of the slider and channels, and apply grease as needed to reduce friction and prevent shaking.

Conclusion

Shaking during boom extension is a serious issue that should be addressed promptly. Ignoring this problem can lead to more severe consequences for your truck-mounted crane. By identifying the cause of the shaking and applying the appropriate solution, you can maintain the crane’s performance and safety.

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