The main control valve was removed for repairs, but upon external servicing and reinstallation, issues arose when attempting to lift the machine's boom. There was noticeable inconsistency in the coordination between components, making leveling operations challenging. Despite replacing the hydraulic pump, handle assembly, and the main arm cylinder seal, the problem persisted. Over three months passed, and the equipment continued to operate with unresolved issues.
Seeking a resolution, users reached out to several N hydraulic maintenance professionals, but their efforts proved futile. During an on-site assessment, I observed that the large arm’s lifting speed was sluggish, taking 4.85 seconds for a single lift. Further testing revealed that the forearm and bucket functions performed adequately, but when both arms were used together, the forearm moved faster than expected while the large arm barely budged. This only changed once the forearm was nearly fully extended, prompting the large arm to begin its ascent.
Analyzing these symptoms, it appeared that the issue lay in how the arms interacted when combined. Testing the boom lift action showed that Pump 2 registered 30MPa while Pump 1 remained at 4MPa, indicating no confluence during the lift. Further investigation into the logic valve associated with the main arm revealed a wiring error where oil pipe PB was incorrectly linked to DR5 instead of DR4. Even after correcting this, there was still no pressure buildup when lifting the large arm.
Suspecting a fault in either the pilot selection valve or the upper arm's merging/cutting solenoid valve, we examined the latter and discovered it was stuck in the closed position (normally open). Cleaning and resetting the valve seemed to help, but subsequent measurements showed zero pressure at the logic valve PB port during an upper arm lift. Interestingly, pressure readings were normal (4MPa) when lowering the arm. This discrepancy suggested incorrect oil line connections.
After thorough inspection, we identified a misinstalled high-arm oil line at the shuttle valve block. Correcting this restored normal pressure readings. However, even after these fixes, the large arm still moved sluggishly during combined actions. Testing showed zero pressure at the forearm 2px port, leading us to discover that the forearm fusion valve hose 2px was improperly connected to the main control valve oil port DR1.
It became clear that the initial failure stemmed from incorrect reassembly of the main arm merging solenoid valve post-cleaning. By contacting experienced distribution agents who specialize in such repairs, we were able to resolve the issue. Following correction of the hydraulic lines, the upper arm lift time dropped to 2.8 seconds during testing, fully restoring its performance.
In summary, engaging professional distributors with expertise in this area is crucial. Always ensure proper labeling and marking when handling or replacing hydraulic oil lines to prevent costly mistakes. Negligence in this regard can lead to significant complications and financial loss—problems that are entirely avoidable with careful attention to detail.
Stainless Steel Faucet
Bestware Stainless Steel Faucet brings the fine design and high technology together in all areas of the product process beyond Pull Out Faucet , Commercial Faucet and Commercial Kitchen Faucet. With extensive range of components, we can offer a large selection of both standard Pre-rinse Faucet and custom Basin Tap units as well as flexible combination. Stainless steel is 100% recyclable and is comprised of over 60% recycled material, Bestware faucets are the perfect solution in the commercial and industry for better water quality and the circumvention of the development of deleterious substances and bacteria. No plating, no oxidizing, no rust, lead free.
Stainless Steel Faucet,Black Stainless Steel Faucet,Stainless Faucet,Stainless Steel Bathroom Faucet
Bestware Hardware Production Co., Ltd. , https://www.bestwaremfg.com