What Causes Weakness in the Loader Boom?
4 Answers
Here are the specific reasons for the weakness in the loader boom: Low system pressure: The pressure gauge should display 17 MPa. If the reading is lower, the safety valve should be disassembled and inspected for issues such as a broken pilot valve spring, poor sealing, a stuck main valve core, or a blocked damping hole. Internal leakage in the boom cylinder or bucket cylinder: If a significant amount of hydraulic fluid leaks from the rodless cavity port, it indicates that the piston sealing ring is damaged and needs replacement. Internal leakage in the distribution valve: The main causes of internal leakage in the distribution valve include a stuck main valve core in the main safety valve, excessive clearance between the valve stem and valve body, scoring on the valve stem or valve body, or damaged seals. Internal leakage in the working gear pump: Internal leakage in the gear pump is characterized by loud noise during operation, which increases with higher engine speeds. A large amount of copper particles can be observed in the oil filter.
Having operated loaders at construction sites for over a decade, I've frequently encountered weak boom issues, which are typically caused by hydraulic system failures. Worn-out or underperforming hydraulic pumps, clogged oil circuits, or leaks can all reduce pressure, resulting in the boom's inability to lift. Sometimes, it's due to worn cylinder seals causing oil leaks and insufficient pressure. I remember one rainy day last year when the boom suddenly became sluggish—upon inspection, we found cylinder leaks and low oil levels, which were promptly refilled to resolve the issue. Contaminated or dirty hydraulic oil can also trigger this malfunction, so regular filter replacements are essential. Additionally, if the shift valve gets stuck and can't control oil flow, it will similarly weaken the boom. Routine maintenance, including cleaning oil circuits and inspecting seals, can prevent major problems.
Having used the loader for several years, weak boom power might be related to hydraulic pressure control, such as decreased efficiency of the main pump or wear of the distribution valve, leading to insufficient oil pressure to support the boom movement. Air bubbles in the hydraulic system can also affect performance, making it feel sluggish. Additionally, hydraulic oil viscosity being too high or too low is particularly noticeable during cold starts. For automated loader designs, issues with electronic control components like faulty control switches or malfunctioning sensors can cause the boom to be unresponsive. The key is to use a pressure gauge to test the system pressure; if it falls outside the normal range, it indicates a fault. Pay attention to oil quality changes during daily use, and don’t delay replacing hydraulic oil—accumulated impurities are often the culprit. Prevention is key, and safe operation should always come first.
Weak boom operation may stem from improper hydraulic system maintenance, with low oil level or contaminated oil being common causes. Check for oil circuit leaks and tighten any loose pipe connections. A clogged control valve can obstruct oil flow, requiring disassembly for cleaning. Damaged piston sealing rings cause internal leaks, necessitating replacement to restore pressure. Develop a habit of pre-operation inspections to save time and costs. Address issues promptly by sending for repairs to avoid affecting project progress.
