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How To Replace Mechanical Seals
Oct 31, 2018

How to replace mechanical seals

Mechanical seals are very important for chemical pumps, hot water pipeline pumps, and oil pumps. The installation of mechanical seals allows the pump to achieve leak-free operation, greatly improving the working environment of the pump management personnel and extending the service life of the pump.

The following is a detailed explanation of the installation steps of the mechanical seal:

(1) Prepare the workbench (ground) and disassembly tools for the pump parts. Do not use any mechanical seals to avoid any damage to the pump parts.

(2) Confirm that the motor is in the inspection state before disassembly; unscrew the refueling screw plug and use the suction pipe to suck out the lubricating oil in the sealing seat cavity.

(3) Disassemble the split coupling: first unscrew the fixed hexagon socket screw of the coupling, and then gently pull the coupling half down from the shaft (be careful not to fall). Use a Torx wrench to unscrew the pump shaft lifting bolts and stops, let the impeller slowly sink to the pump body, remove the other half of the coupling, and take off the pump shaft retaining ring.

(4) Remove the seal seat: Unscrew the seal seat compression nut and gently remove the seal seat (note: do not break the rubber seal on the seat) and clean it.

(5) Disassemble and clean the bearing seat: firstly move the bearing seat lightly, then lift the bearing seat with the disassembly bolt and lift it up along the pump shaft; clean the bearing and seat with jet fuel, dry it before installation and Apply a little 20 mechanical oil lubrication protection.

(6) Disassemble the mechanical seal: Grab the sealing spring and lift it up along the pump shaft to disassemble it.

(7) Mechanical seal assembly: Apply a clean layer of No. 20 lubricant on the moving and static ring mirror surface; apply lubricant to the guide bearing seat, firstly position the static ring into the guide bearing seat; then on the pump shaft Apply grease, gently insert the moving ring part of the mechanical seal into the pump shaft, and gently push the sealing ring by hand to be able to expand and contract freely (note that the anti-rotation part of the moving and stationary ring parts should be assembled in place).

(8) Mounting the sealing seat: The rubber seat is first installed on the sealing seat, then the sealing seat is placed in the pump cover and pressed on the bearing seat, and the nut is tightened.

(9) Install the coupling: first install the retaining ring on the motor shaft head, install the half coupling, install the stopper in the pump shaft end and the coupling groove and tighten the bolt with the wrench (lift the pump shaft 3 ~5 mm and provide mechanical seal prestress); reinstall the other half of the coupling and screw the hexagon socket head cap screws. The correct inspection requirements for the installation of the coupling: the upper and lower gaps of the split coupling are even; the rotation of the coupling is controlled by several turns of the coupling.

(10) Check whether the mechanical seal is correct and the pump set is operating normally according to the test run of the key points.

Jiaxing Burgmann Mechanical Seal Co., Ltd

Contact: Doris Sun

TEL: +86-573-84133388

Fax: +86-573-84133388



Address: No. 1168 Jinyang Road, Luoxing Street, Jiashan County, Jiaxing, Zhejiang, China