Hydraulic units serve as the core power equipment for dump trailers, responsible for lifting the carriage and finishing material unloading. In actual outdoor construction and transportation work, hydraulic system failures happen quite often. Most of these problems come from long-term component aging, deteriorated hydraulic oil and blocked internal pipelines. The majority of daily malfunctions can be sorted into three main types, which are easy to solve and avoid with proper daily maintenance.
Slow lifting movement or a completely immovable trailer carriage is the most typical fault. Multiple factors can trigger this problem, such as insufficient hydraulic oil, impure oil with impurities, aging hydraulic pumps and blocked oil suction pipelines. A lack of hydraulic oil makes the system unable to build enough pressure to support load lifting. Meanwhile, dirty oil with precipitates will block pipeline passages and valve parts. Operators need to check the oil volume before starting work and add oil to the standard scale when necessary. For trailers used frequently, regular oil replacement is indispensable. Cleaning blocked pipelines and replacing damaged pumps can help the system return to normal working pressure.
Hydraulic oil leakage is also a common malfunction, mainly appearing at cylinder sealing rings, hose interfaces and valve connection parts. Long-term high-pressure operation and continuous mechanical friction will gradually wear rubber seals and crack hydraulic hoses. Regular manual visual inspection is the most
effective prevention method. Once worn, cracked or aging seals and hoses are found, workers must replace them in a timely manner. Fastening loose connecting parts can well prevent oil leakage and system pressure drop.
It is also common to see the trailer carriage sink slowly when the vehicle is parked. This issue arises when accumulated dirt clogs control valves and affects their normal operation, or when check valves lose their pressure locking function. Simple dirt cleaning on valve components can fix minor clogging issues, while badly damaged valves need to be replaced entirely. In addition, exhausting trapped air inside the hydraulic system on a regular basis is vital to stable equipment operation. Consistent daily maintenance can greatly reduce hydraulic malfunctions and effectively prolong the service life of dump trailer hydraulic systems.
