What Causes Abnormal Vibration in the Hydraulic Hose of the Rotary Drive Head Motor?
5 Answers
The abnormal vibration in the hydraulic hose of the rotary drive head motor can be attributed to the following reasons: Low Pressure Displayed by the Main Pump: The relief valve on the power oil seat may be stuck or damaged, leading to excessively low relief pressure. This condition is often characterized by normal operation under no load but weak or non-functional rotation under load. It is usually caused by the owner's neglect of regular machine maintenance, such as failing to replace or filter the hydraulic oil over time, resulting in valve spool sticking. Cleaning the relief valve spool, readjusting the relief pressure, or replacing the relief valve can resolve this issue. Low Relief Pressure of the Main Valve Safety Valve: The main valve typically has a main safety valve and independent relief valves for each valve plate. Pressure release from the main safety valve or the relief valves controlling the rotary drive head valve plates can cause weak rotation of the drive head. If the main safety valve is relieving pressure, not only will the drive head rotation be weak, but functions like travel, main hoist, auxiliary hoist, and slewing will also exhibit weakness. Readjusting the relief pressure of the main safety valve or the rotary drive head valve plate relief valves can eliminate this fault.
I've dealt with similar issues before, which mostly occur in older machinery. Abnormal oil pipe shaking is commonly caused by loose screws at connection points or worn clips, which worsen vibration during operation. Sometimes, contaminated hydraulic oil or air bubbles entering the system can lead to unstable oil pressure, causing tremors. During my inspection at the construction site, I found it necessary to first shut down the machine, check all fixed points for tightness, reinforce them with a wrench, and then conduct a test run. If the shaking persists, it's essential to examine the oil quality and motor health—blackened oil or impurities require replacement, and internal seal damage in the motor can cause leakage-induced shaking. Preventive measures include regular maintenance, such as checking fasteners and cleaning oil pipes every 200 hours of operation to avoid downtime and project delays. If any abnormalities are detected, immediate shutdown and repair are crucial for safety.
I have encountered shaking issues multiple times when operating this type of machinery. The key factors may be unstable oil pipe installation or sudden load increase during operation causing instant oil pressure rise and vibration. I always check whether the clips and interfaces are loose before starting up - a simple touch tells. Additionally, insufficient or expired hydraulic oil can make the system unstable, leading to abnormal shaking. The solution is straightforward: first stop operation, inspect connection points and apply lubricant for tightening; observe oil level and quality, replenish or replace if insufficient. Through long-term work at construction sites, I've found that neglecting such minor issues can escalate into major failures, like oil pipe bursts and spraying, increasing maintenance costs. Therefore, timely handling is the most worry-free approach.
I have a particular interest in mechanical hydraulic systems. Hose vibration is often caused by system cavitation or resonance, such as pressure fluctuations due to air bubbles forming in the hydraulic fluid. Internal motor issues, like pump component wear, can also lead to hose vibration. I recommend first attempting a bleeding operation—open the system's air release valve to check if air is expelled; then observe at which RPM the vibration is most severe. A simple DIY check involves inspecting hoses for twists or aging, wiping off dust, and reinforcing connections. This can help preliminarily rule out issues, but complex faults require professional tools.
From a safety perspective, abnormal oil pipe shaking should never be taken lightly. The shaking may indicate excessive oil pressure or loose connections, with potential risks including oil leaks leading to fires or operational failures. I recommend stopping the equipment immediately to avoid further increasing the load. Key inspection points include checking the integrity and fastening condition of the oil pipe, replacing it immediately if cracks are found; and evaluating the hydraulic system pressure to ensure it is within the normal range. Preventive maintenance, such as weekly inspections of the oil pipe condition and cleaning, can significantly reduce the occurrence of such failures, ensuring a safe working environment.
