Pump Repair and Services

Technical Guide: Cartridge Mechanical Seal Installation on Pumps


  • Safety Precautions:
    • Adhere to lockout/tagout procedures to isolate the pump from the power source.
    • Release system pressure to ensure a safe work environment.


  • Carefully disassemble the pump following the OEM (Original Equipment Manufacturer) guidelines.
  • Remove the existing mechanical seal, noting its orientation and inspecting for wear.

Inspection and Cleaning:

  • Inspect pump components for wear, damage, or corrosion.
  • Thoroughly clean pump and seal chamber surfaces to ensure optimal conditions for the new seal.

Cartridge Seal Preparation:

  • Assemble the components of the cartridge mechanical seal according to the manufacturer’s specifications.
  • Apply a thin, uniform layer of a compatible lubricant to the seal faces.


  • Insert the cartridge seal into the designated position in the seal chamber.
  • Follow the prescribed sequence for installing the seal components, ensuring proper orientation.

Alignment Verification:

  • Utilize precision tools to verify the alignment of the cartridge seal within the seal chamber.
  • Confirm that there are no points of interference between the seal components.

Fastener Tightening:

  • Gradually and evenly tighten the fasteners securing the cartridge seal.
  • Refer to torque specifications provided by the manufacturer to prevent misalignment or over-compression.

Gasket and O-Ring Replacement:

  • Replace gaskets and O-rings with new, compatible components.
  • Apply a suitable lubricant to facilitate proper sealing.


  • Reassemble the pump components in accordance with the OEM guidelines.
  • Tighten all bolts and fasteners to the specified torque values.


  • Conduct a controlled test run of the pump to evaluate the effectiveness of the newly installed cartridge seal.
  • Monitor for any signs of leakage or abnormal vibrations.

Performance Monitoring:

  • Continuously monitor the pump’s performance during regular operation.
  • Address any deviations promptly and consult OEM guidelines for troubleshooting.

Always adhere to the specific instructions provided by both the pump and mechanical seal manufacturers. In case of uncertainties or technical challenges, seek assistance from a qualified technician or the manufacturer’s technical support.