What re inspection is required for hydraulic pipelines after the vehicle arrives at the port and unpacks

Heavy trucks and dump trucks are prone to problems such as hidden displacement, loose joints, and slight pressure relief in the hydraulic pipelines of the entire vehicle after long-distance sea transportation, container fixation, and ship body shaking and tilting. Many overseas customers directly put their vehicles into operation after unpacking, neglecting the re inspection of hydraulic pipelines, resulting in short-term malfunctions such as oil leakage, pressure relief, weak lifting, and pipeline detachment, which affects the reputation of new car use. After the vehicle arrives at the port, completing the special re inspection of the hydraulic pipeline in a standardized manner is a key step to avoid early failures and ensure stable operation of the equipment.
Firstly, visually inspect the appearance of the entire vehicle's pipelines and identify potential hazards of collision and wear. Fixed packaging and rough shipping can easily cause friction between oil pipes, frames, and brackets, resulting in outer skin wear, bulges, and cracks. During the re inspection, it is necessary to comprehensively check the appearance of the lifting oil pipe, inlet and outlet oil pipe, and high-pressure hose to see if there is any compression deformation, outer skin damage, or local white stretching marks. At the same time, clean up the debris around the pipeline, check whether the pipeline layout is neat, and prevent secondary wear and oil leakage during later driving.
Focus on tightening all hydraulic joints and eliminating loose pressure relief issues. Continuous vibration throughout the shipping process can cause slight looseness in the threaded joints and sleeve joints of the pipeline, resulting in hidden oil leakage and pressure attenuation. It is necessary to recheck the high and low pressure joints, valve body interfaces, and oil cylinder bottom joints one by one, and tighten them evenly according to the standard torque to avoid thread displacement caused by unilateral force. It is strictly prohibited to work with loose joints under pressure to prevent safety accidents caused by the detachment of high-pressure oil pipes.
Check the fixing clips and shock-absorbing rubber pads of the pipeline. Hydraulic pipelines rely on buckles and rubber pads for positioning and shock absorption. Shipping vibrations can easily cause buckles to fall off, rubber pads to shift, and pipelines to sway in the air. The vibration amplitude of suspended pipelines is large during operation, and long-term operation will accelerate the fatigue cracking of oil pipes. Re inspection requires filling missing buckles, resetting offset rubber pads, and ensuring that the pipeline is firmly fixed to the frame throughout the entire process, without any hanging or shaking allowance.
Check the hydraulic seal status and potential leakage hazards. The new car is left idle for a long time during sea transportation, and the sealing ring is prone to short-term rebound under pressure. The joint gap is also prone to slight oil leakage. Carefully inspect the joint end face and cylinder seal for oil stains and moisture, and re tighten the slight oil leakage points. At the same time, check the oil level in the hydraulic oil tank, replenish the lost oil, investigate the intake and pressure relief issues in the pipeline, and ensure stable pressure in the hydraulic system.
No load test run to verify that the system is in good working condition. After the static inspection is completed, multiple empty lifting and bucket dropping tests are required to observe whether the lifting speed is stable, whether there is no abnormal noise, whether the pipeline is shaking abnormally, and whether the joints are leaking. Through practical operation, identify hidden faults that cannot be detected statically, ensure that the hydraulic system is completely normal, and then put it into heavy-duty operation.
In summary, the re inspection of hydraulic pipelines after the unpacking of vehicles at the port is an important process for the delivery of new vehicles. Through appearance inspection, joint fastening, buckle reset, sealing inspection, and no-load testing, hidden faults caused by sea transportation can be completely eliminated, ensuring the stability and reliability of the hydraulic system of dump trucks, effectively reducing the after-sales failure rate of overseas new cars, and improving customer driving experience.