Recently, manytruck-mounted craneowners have been extremely confused and frequently ask when the hydraulic oil of the crane should be changed. Some might mistakenly assume that it is similar to private cars and should be changed only after it is completely used up. In reality, this is a significant misunderstanding. For the hydraulic oil of a crane, determining whether to change it is not based on simply waiting for it to be depleted but rather by identifying its viscosity. Today, the author will thoroughly teach you how to judge when hydraulic oil should be changed. Here are the detailed judgment steps:
Inverting hydraulic oil: Take out a portion of the hydraulic oil from the fuel tank and place it in two transparent glass bottles of the same size as the brand-new hydraulic oil respectively. Ensure that the bottle caps are tightly secured. Mark the two small bottles clearly and place them side by side. Ces, invert them. This process is crucial for observing the behavior of the hydraulic oil. If the bubbles exhibited by the tested hydraulic oil in the bottle rise faster than those of the standard oil in the bottle, Nws indicates tias cov viscosity ntawm cov roj hydraulic roj yog tsawg dua uas tus txheem hydraulic roj. On the contrary, if the bubbles rise more slowly, it indicates that the viscosity of the hydraulic oil is higher. If the bubble rising speeds in the two bottles are close, it suggests that the viscosities are similar and there is no need to dilute or change the hydraulic oil at this time.
Let’s delve deeper into this step. The inversion of the bottles allows for a visual comparison of the bubble movement. The speed at which the bubbles rise is directly related to the viscosity of the oil. A lower viscosity oil will allow the bubbles to rise more quickly as it is less resistant to flow. This can be an indication of degradation or contamination of the hydraulic oil. Qhov txawv ntawd, a higher viscosity oil will cause the bubbles to rise more slowly as it is thicker and more resistant to flow. By comparing the bubble movement to that of a standard, new hydraulic oil, one can get a good indication of the condition of the used oil.
Iav phaj inclination txoj kev: Take a clean glass plate and place it horizontally on a flat surface. Carefully drop a drop of the hydraulic oil taken from the fuel tank on one side of the glass. Tib lub sijhawm, drop a drop of standard hydraulic oil on the other side. After this preparation, start to incline the glass plate gently. Observe the flow rate and flow distance of the two drops of oil. If the flow rate and flow distance of the tested hydraulic oil are both larger than those of the standard hydraulic oil, it indicates that its viscosity is lower than that of the standard hydraulic oil. Conversely, if the flow rate and flow distance are smaller, the viscosity is higher.
This method provides another way to assess the viscosity of the hydraulic oil. As the glass plate is inclined, the oil will start to flow down due to gravity. The rate and distance of flow are influenced by the viscosity of the oil. A lower viscosity oil will flow more quickly and cover a greater distance, while a higher viscosity oil will flow more slowly and cover a shorter distance. By comparing the behavior of the tested oil to that of the standard oil, one can further confirm the condition of the hydraulic oil.
It should be noted that normally, when a crane works for about two to three years, which is approximately 2,000 working hours, the hydraulic oil needs to be changed. tiam sis, this is only a general guideline. In theory, the oil change standard depends on several factors such as the viscosity and aging degree of the oil, as well as whether it is clean. Txhua hnub siv, the decision to change the hydraulic oil is often determined based on actual working conditions and experience.
Piv txwv, Yog hais tias cov crane siv nyob rau hauv ib cheeb tsam hnyav uas muaj peevxwm, loads hnyav loads, thiab nquag ua hauj lwm, Cov roj hydraulic yuav degrade sai sai thiab yuav tsum tau hloov sai sai. Qhov txawv ntawd, Yog hais tias cov crane siv nyob rau hauv ib cheeb tsam kuj me ntsis nrog teeb loads thiab infrequent lag luam, Cov roj hydraulic yuav ntev li ntawm. txuas ntxiv, regular inspections of the hydraulic system can help detect signs of oil degradation such as discoloration, increased acidity, or the presence of contaminants. These signs can indicate the need for an earlier oil change.
After determining that the hydraulic oil needs to be changed, the next step is to carry out the oil change process.
Thawj, muab cov roj hydraulic roj nyob rau hauv lub tank hydraulic tank. This is a crucial step as it removes the old, degraded oil from the system. Carefully remove the drain plug or use a suitable pumping device to drain the oil completely. Tom qab muab cov roj, clean the tank thoroughly to remove any sediment, Av, los sis tsis zoo uas tej zaum yuav muaj tsim nyog. Qhov no yuav siv tau ib daim ntaub los kho cov khaub ncaws los yog ib tug mob me ntsis. Thaum lub tank yog huv si, ntxiv tshiab hydraulic roj. Xyuas kom paub tseeb tias siv cov ntawv kho mob thiab qib uas cov roj raws li specified los ntawm cov crane manufacturer.
Tshem lub ntsiab loop pipe. This step allows for the flushing of the hydraulic system. Pib lub cav thiab cia nws idle kom cov roj twj tso kua mis. The oil pump will circulate the new oil through the system and help remove any remaining old oil.
Khiav lag luam txhua mechanism feem. This step ensures that the new oil reaches all parts of the hydraulic system. Manually operate each hydraulic mechanism such as the boom, eb, thiab outriggers. Siv cov roj hydraulic roj mus discharge cov roj qub nyob rau hauv cov loop ib los ntawm ib tug mus txog rau thaum cov roj tshiab flows tawm hauv lub ntsiab xa rov qab. This process may need to be repeated several times to ensure that all the old oil is replaced.
The last step is to connect the main return pipe to the fuel tank and add new hydraulic oil to the specified position in the fuel tank. Check the oil level carefully and make sure it is within the recommended range. Once the oil change is complete, run the crane for a short period to check for any leaks or abnormal operation.
The above is the normal process of changing hydraulic oil. Have you learned it? Hloov cov roj hydraulic roj ntawm ib truck-mounted craneis an important part of maintenance. Regular oil changes can help ensure the proper functioning of the hydraulic system, prolong the life of the crane, and reduce the risk of breakdowns and costly repairs. By following the correct procedures and paying attention to the signs of oil degradation, crane owners can keep their equipment in good condition and ensure safe and efficient operation.
