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How to mount an oil seal

How do I install an oil seal correctly?



We have compiled these useful tips to make installation easy for you. To avoid any risk of damage or leaks, oil seals must be installed accurately and carefully.

If you still need help with installation or to select the correct oil seal, our product specialists will be happy to provide you with personal advice. Call us on +31 (0)72 514 18 55 or email us on OKHY@eriks.nl.


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Wide range of oil seals

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At an angle of 30° to 50°


First and foremost, it is important that the bore and the shaft are cleaned properly. Any dirt between the seal lip and the shaft will cause subsequent leaks. Because the internal diameter of the oil seal has to be expanded during installation, the shaft must have a lead-in edge. The lead-in chamfer angle must be 30° to 50°.

If the shaft has a breast or keyway, you can use a mounting tube. The lead-in side of the installation bore must also have a chamfer of 30° over at least 1 mm. Make sure that you round off the edges properly.

Oil seal mounting


Avoid any damage to the seal lip


If a keyway, screw thread or other irregularity is caused by sliding the oil seal over the shaft, the best approach is to wrap thoroughly on site. Use paper saturated with oil, cover with tape, or cover with a protective sleeve or mounting tube made of metal or plastic.

Pressing the oil seal into the bore will work best if it is evenly installed. Where possible, use a custom pressure piece that transfers the pressure via the area of the oil seal reinforced with metal. For the oil seal to operate correctly, the seal lip must be aligned with the medium to be sealed.

To make it easier to slide over the shaft, both the shaft and the oil seal lip must be lubricated properly beforehand with grease or oil. Oil seals with a leather seal lip must be soaked in oil for some time in advance.


Oil seal mounting steps


Do's & don'ts


1. Do not use a diameter that is too small.
Oil seal mounting steps



2. Use installation tools.
Oil seal mounting steps



3. Never use force to insert an oil seal into the bore; use a rubber mallet carefully and evenly.
Oil seal mounting steps



4. If you are using oil seals with a metal jacket (M and GV types from ERIKS), we advise you to use an Omnifit product (this also acts as a sealing compound). Applying a lubricant to the shaft will help the seal to bed in. Lubricating the bore will also make installation easier.
Oil seal mounting steps


Troubleshooting


Problem Cause Advice
The oil seal rotates along with the shaft The outer diameter of the oil seal is smaller than the internal diameter of the bore. Choose an oil seal in the proper size and replace the original seal.
The oil seal moves in an axial direction along the shaft The outer diameter of the oil seal is smaller than the internal diameter of the bore.
Excess pressure is displacing the oil seal axially.
Choose an oil seal in the proper size and replace the original seal.
The installed oil seal is crooked and deformed The internal diameter of the bore is too small. Check the dimensions of the bore for the correct value.
The body of the oil seal is deformed The incorrect tool was used during installation. Use the correct tool.
The circumference of the oil seal is damaged The bore was incorrectly finished or incorrectly installed. Check the roughness of the bore and check whether there is a lead-in edge.
Dirt on the circumference of the oil seal or on the inside of the bore. Clean all the parts before installation.
Seal lip heavily worn Inadequate lubrication. Ensure that there is adequate and proper lubrication.
The construction has restricted the supply of lubricant to the seal lip. Change the construction, so that adequate lubricant can reach the seal lip.
The lip is partially worn The oil seal is not centred in relation to the shaft in the bore. Centre the seal in relation to the shaft. Use the correct installation tools.
The seal lip is hardened, worn and has cracks Excessive temperatures.
Excessive shaft speed.
Excessive pressure.
Choose the correct rubber compound and type of oil seal.
Inadequate lubrication. Ensure that there is adequate lubrication.
The seal lip is swollen Incorrect rubber compound. Choose the right material.
The seal lip is scratched. The roughness of the shaft is not correct. Check the roughness of the shaft.
Scratches caused by incorrect tools and installation. Ensure installation is carried out correctly.
The lip is folded over Incorrect installation. Lubricate the seal lip and shaft before installation.
The pressure in the medium is too high. Choose a type of oil seal that is suitable for excess pressure.
Cracks on the flexible part (membrane) The pressure in the medium is too high.
Sudden pressure surges on the flexible part.
Choose a type of oil seal that is suitable for excess pressure.
Coil spring out of the groove The lead-in chamfer angle on the shaft is incorrect. Create a lead-in angle on the shaft or use a mounting tube.
Incorrect installation. Install the oil seal carefully.
The groove for the spring is too shallow. Choose a different design or use a spring with a smaller cross-section.

Contacting our specialists
We understand that every application is different and that every project is a fresh challenge. That is why our product specialists are at hand to provide you with personal advice and in-depth product knowledge.

Call us on +31 (0)72 514 18 55 | Email us on OKHY@eriks.nl.



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