What Causes Weakness in the Loader Boom?
2 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.
