What problems can occur if a gear oil pump is left unused for a long time?

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　　When gear pumps, gear oil pumps, and arc gear pumps are left idle for a long time without operation, problems such as the pump failing to rotate when restarted, seal leakage, or excessive noise can occur. There are several main reasons for this. 　　When gear oil pumps and arc gear pumps are left idle for a long time without operation, leakage will occur in their seals once they are started up again. In mechanical seal gear pumps, the medium being transported can accumulate over time at the end faces of the mechanical seal, leading to carbon buildup. This is especially true when the pump is used to transport highly viscous materials. If the gear pump does not operate for an extended period, the material will stick to the mechanical seal. When the pump is started again, this can result in wear of the mechanical end faces, causing leakage; in severe cases, it can even lead to the breaking of the springs in the mechanical seal, resulting in its complete damage. 　　For example, when a regular cast-iron gear pump is left unused for an extended period of time, since gear pump manufacturers typically use used engine oil from the testing benches during experiments, there is inevitably some water present in that oil. When this water-containing used oil remains inside the pump chamber for a long time and comes into continuous contact with the gears and the pump body, factors such as oxidation due to exposure to air can cause rust to form inside the pump chamber in a short time, resulting in the pump not being able to rotate at all once it is installed and put into use. This situation is quite common among new customers. Generally, customers purchase gear pumps from local stores, but the gear pumps they buy are often the store owner’s inventory or surplus stock (as intermediaries in the gear pump and gear oil pump industry need to maintain inventory, though the duration of that inventory varies). Therefore, we advise all customers who purchase gear pumps or other gear oil pumps locally to first check whether the spindle of the pump rotates smoothly and evenly, so as to avoid unnecessary problems after purchase.