What causes oil leakage in dewatering screen exciters?

release time:

2026-11-10

Oil leakage from the exciter of a vibrating dewatering screen is a common headache for many customers. Oil seeps out from the exciter end cover or shaft extension, flows along the screen box onto the screen surface, and

Oil leakage from the vibrator of a vibrating dewatering screen is a common frustration for many customers. Oil seeps out from the vibrator end cover or shaft extension, flows along the screen box onto the screen surface, and stains the sand with oil spots, affecting finished product quality. If the leak is not addressed, the oil level inside the vibrator drops, bearing lubrication becomes insufficient, and at best the temperature rises—at worst the bearings burn out. The problem usually lies in the seals and assembly precision.

脱水筛激振器漏油是怎么回事？.jpg

Aging and failure of the skeleton oil seal is the most common cause of leakage. At the vibrator shaft extension, a skeleton oil seal blocks lubricating oil from escaping. Under prolonged high-frequency vibration and temperature rise, the rubber lip gradually hardens and wears, sealing ability declines, and oil seeps out between the lip and the shaft journal. It is recommended to check the oil seal condition every six months; press the lip with a finger, and replace it immediately if it feels hard or shows cracks. When installing a new oil seal, apply an appropriate amount of grease to the lip with the lip facing the bearing side—installing it backwards will actually make it leak faster.

Failure of the sealant on the end cover mating surface can also cause leakage. The vibrator end cover and housing are fastened with bolts and sealed with sealant. After prolonged vibration, the bolts loosen and the sealant ages and cracks, allowing oil to seep through the gaps in the mating surface. Each time the vibrator is disassembled, thoroughly remove the old sealant, apply a fresh layer of oil-resistant sealant, and then tighten the bolts. When tightening, work in a diagonal sequence over two to three passes to ensure even force on the mating surface.

An excessively high oil level inside the vibrator or a blocked vent hole can also cause leakage. When the oil fill exceeds the center line of the sight glass, oil splashing intensifies during operation, internal pressure rises, and oil is forced out through weak points in the seals. Fill to the oil level specified in the manual—do not overfill. A blocked vent hole leaves internal pressure with nowhere to escape, which likewise pushes oil out through the oil seal. Check monthly that the vent hole is unobstructed.

During routine inspections, check the bottom of the vibrator for oil traces every shift and address any seepage promptly—do not wait until the oil level runs dry to take it seriously. If you encounter problems during equipment operation, you are welcome to contact the Shanlu Heavy Industry technical team: Manager Zhang 13583776655 (same on WeChat).

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