There are many grease nipples on tractors and farm implements to add grease to agricultural implements. Due to the poor working conditions of agricultural machinery and equipment, dust is easily adhering to the grease nipples. Before filling the oil, the operator wipes the butter mouth with a piece of cloth. Although this can wipe off most of the dust, it also pushes some dust into the closed oil passage of the butter mouth, thus accelerating the wear of the moving friction surface. For this purpose, a short section of 20 mm can be cut into a plastic hose with an inner diameter of 5 mm, and one end of the joint is heated and pressed tightly on the fire to form a plastic dust cover, which is put on the grease nipple. Remove it and cover it after filling to prevent dust from entering the grease nipple.
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