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BURGMANN seals are a common term for general seals, simply referring to lubricating oil seals. They are mechanical components used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances), isolating parts requiring lubrication from output parts in transmission components to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber; generally, when people refer to oil seals, they often mean this type of tc cased oil seal.

BURGMANN seal construction

The structure of a cased oil seal consists of three parts: the seal body, the reinforcing case, and the self-tightening helical spring. The sealing body is divided into the bottom, waist, cutting edge, and sealing lip according to different parts. Usually, in its free state, the inner diameter of the cased oil seal is smaller than the shaft diameter, meaning it has a certain "interference fit." Therefore, after the oil seal is installed on the oil seal seat and shaft, the pressure of the oil seal cutting edge and the contraction force of the self-tightening helical spring generate a certain radial tightening force on the shaft. After running for a period of time, this pressure will rapidly decrease or even disappear, so the spring can compensate for the self-tightening force of the oil seal at any time.

BURGMANN seal usage guide

1) When the gearbox lubricating oil volume is ≤ 7 liters, the addition amount per liter of lubricating oil is 20‐30ml; 2) 7‐15 liters, the addition amount is 15‐20ml per liter of lubricating oil; 3) > 15 liters, the addition amount is 10ml per liter of lubricating oil; 4) Oil seals not in temporary use should be properly stored to prevent contamination with oil stains, dust, or exposure to sunlight. 5) When the shaft diameter wears into a "V" shaped groove, causing the contact pressure between the new oil seal lip and the shaft to drop and fail to seal oil, the displacement method can be used for compensation.

BURGMANN seal troubleshooting

1) Main factors causing oil seal leakage: Poor sealing of the oil seal is the primary factor causing leakage. When the shaft wears and forms grooves, even replacing it with a new oil seal may not achieve proper sealing. This is due to reduced contact pressure between the oil seal lip and the shaft, resulting in insufficient interference fit between the installed oil seal lip diameter and the shaft diameter. Taking the S195 diesel engine crankshaft oil seal as an example, the main reasons for poor sealing are analyzed as follows: (1) Poor manufacturing quality of the oil seal; (2) Poor quality of the shaft or bearing; (3) Improper use and maintenance; (4) Improper installation; (5) Improper storage, leading to adverse effects from environmental contamination. 2) Countermeasures for leakage due to poor oil seal sealing: Acquire basic knowledge to identify counterfeit and inferior products, and purchase high-quality, standard-compliant oil seals. During installation, if the outer surface roughness of the shaft diameter is low, or if there are defects such as rust spots, corrosion, or burrs, polish them smooth using fine sandpaper or an oil stone. Apply clean engine oil or lubricating grease to the oil seal lip or the corresponding position on the shaft diameter. Apply sealant to the outer ring of the oil seal. Wrap the keyway area on the shaft with hard paper to avoid scratching the oil seal lip. Use a special tool to rotate and press the oil seal inward. Never hammer or force it in, to prevent deformation of the oil seal or breakage of the spring, which would cause failure. If lip flipping, spring detachment, or oil seal skewing occurs, it must be removed and reinstalled. Note: Do not arbitrarily tighten the inner spring when the shaft diameter is not worn and the oil seal spring tension is sufficient. Oil seals used in machinery generally operate under harsh conditions, with large ambient temperature differences, significant dust, and frequent vibration causing constantly changing stress on components. Therefore, frequent inspection, maintenance, and upkeep are required. If the shaft diameter and bearing are severely worn, or if the oil seal rubber is aging or the spring has failed, repair and replace the corresponding parts promptly. Troubleshoot abnormal heating in components or assemblies immediately. Avoid mechanical overspeeding and overloading to prevent increased temperature at the oil seal lip, rubber aging, and premature lip wear. Regularly check the engine oil level. If the engine oil contains excessive impurities, such as alloy powder or metal shavings, completely replace it with new oil. The brand and quality of the replacement oil must meet seasonal requirements. It is recommended to add Metra Super Sealant & Lubricant to the engine oil. It is an excellent gearbox additive that forms an inert material film on components, which can reduce oil seal leakage, extend the service life of oil seal gears, and reduce gearbox noise. The use of this Metra super sealant lubricant will not contaminate the oil or cause deterioration.

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