German Zemo seals, Zemo models, Zemo prices

Zemo seals are typical representatives of oil seals; the term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication within transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. Based on structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. Based on skeleton type, they can be divided into inner-covered skeleton oil seals, exposed skeleton oil seals, and assembled oil seals. Based on operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

Zemo seal advantages

1) Oil seals have a simple structure and are easy to manufacture. Simple oil seals can be molded in a single step; even the most complex oil seals do not have complicated manufacturing processes. Metal skeleton oil seals only require processes such as stamping, bonding, inlaying, and molding to combine metal and rubber into the required oil seal. 2) Oil seals are lightweight and consume little material. Each oil seal is a combination of thin-walled metal and rubber components, resulting in minimal material consumption and very light weight for each oil seal. 3) Oil seals require small installation space and have small axial dimensions, making them easy to process and contributing to compact machine design. 4) Oil seals offer good sealing performance and long service life. They have certain adaptability to machine vibration and main shaft eccentricity. 5) Oil seals are easy to disassemble and convenient to inspect. 6) Oil seals are inexpensive.

Zemo seal precautions

1) Preparation and precautions before startup: a. Comprehensively check whether the mechanical seal, auxiliary devices, and pipeline installations are complete and comply with technical requirements. b. Conduct a static pressure test on the mechanical seal before startup to check for leakage. If leakage is significant, identify the cause and eliminate it. If ineffective, disassemble for inspection and reinstall. Generally, the static test pressure is 2~3 kg/cm². c. Rotate the pump according to its direction of rotation to check if it moves lightly and evenly. If rotation is difficult or stuck, check for errors in assembly dimensions and reasonable installation. 2) Installation and shutdown: a. Keep the seal chamber filled with liquid before startup. When transporting solidifying media, use steam to heat the seal chamber to melt the medium. Manual rotation must be performed before startup to prevent sudden startup from causing soft ring fracture. b. For mechanical seals utilizing an external seal oil system, start the seal oil system first. Stop the seal oil system last after shutdown. c. After stopping a hot oil pump, do not immediately stop the cooling water for the seal oil chamber and face seal. Wait until the oil temperature at the face seal drops below 80 degrees before stopping the cooling water to avoid damaging seal components. 3) Operation: a. If slight leakage occurs after pump startup, observe for a period. If continuous operation for 4 hours does not reduce leakage, stop the pump for inspection. b. Pump operating pressure should be stable, with pressure fluctuations not exceeding 1 kg/cm². c. During pump operation, avoid cavitation to prevent dry friction of the sealing surfaces and seal damage. d. Regularly check the sealing condition. During operation, if leakage exceeds standards (heavy oil not greater than 5 drops/min, light oil not greater than 10/min), and there is no improvement trend within 2-3 days, stop the pump to inspect the sealing device.

Zemo seal troubleshooting

1) Main factors causing oil seal leakage: Poor sealing of the oil seal is the primary cause of oil leakage. When the shaft wears and forms grooves, even replacing it with a new oil seal may not achieve proper sealing. This occurs because the contact pressure between the oil seal lip and the shaft decreases, resulting in an insufficient interference fit between the installed oil seal lip diameter and the shaft diameter. Taking the S195 type 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 oil leakage due to poor oil seal sealing: Acquire basic knowledge to identify and distinguish counterfeit or inferior products, and purchase high-quality, standard-compliant oil seals. During installation, if the outer surface of the shaft diameter has low roughness or defects such as rust spots, corrosion, or burrs, polish it 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 specialized 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 the lip edge flips, the spring detaches, or the oil seal becomes skewed, 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, including large environmental temperature variations, high dust levels, and frequent equipment vibration that causes 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 ages or the spring fails, repair and replace the corresponding parts promptly. Troubleshoot abnormal heating in components or assemblies immediately. Avoid overspeeding or overloading the machinery 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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