How to install a mechanical Seal
Here are some basic steps for installing a cartridge seal. These steps will vary depending on the type of seal and the pump technology it’s going into, but for this example these steps relate to installing a cartridge mechanical seal into Viking Pump’s 4124A Series™.
1. Place the seal installation sleeve into the shaft and lubricate the sleeve and shaft. | ![]() |
2. Slide the seal assembly onto the shaft and over the installation sleeve until the assembly contacts the bracket face. | ![]() |
3. Remove the installation sleeve. | |
4. Reassemble the pump and set the end clearance. | |
5. Install the gland cap screws. Do not fully tighten at this time. | ![]() |
6. Turn the shaft several times to center the seal. | |
7. Tighten the cap screws tight enough to compress the seal gasket. | |
8. Evenly tighten the seal sleeve set screws to set the collar to the shaft. | ![]() |
9. Rotate or remove the seal spacers and check rotation. | ![]() |
10. Reconnect seal plan or plug unused connections. |