How To Replace The Compression Seal On A Small Industrial Pump

Compression seals wear out after prolonged use and will have to be replaced. Here is how you can replace the compression seal in a small industrial pump.

You Will Need:

  • A Compression Seal Kit
  • Combination Wrenches
  • Ball Peen Hammer
  • Small Pry Bars
  • Ratchet Set
  • Screwdriver
  • Impact Gun

Remove the Pump from the Frame

You have to remove the pump assembly from the motor and frame. There are usually a couple of bolts you have to remove to detach the foot from the bottom of the pump frame, and several more bolts that connect the pump casing to the motor's casing. Once the bolts are removed, slide the shaft out of the motor and carefully set the pump down on a table.

Remove the Compression Seal

The first thing that has to be removed from the pump assembly is the propeller. Remove the propeller bolt with the impact drill so you can slide the propeller off of the shaft – if it sticks, you can use pry bars to wiggle it loose.

The compression seal assembly is right behind the propeller, and you should be able to grab it and easily pull it off the shaft. The next step is to remove the seat the compression seal sits on.

Remove the Seat

Unscrew the bolts and remove the section of the pump that is directly behind the propeller.  The seat is in the middle of this section. You'll need to pop out the seat by turning this section over so you can get at it from the back and pry it loose with a screwdriver. You can bang the screwdriver with a hammer if you need extra force to get the seat out since it won't be used again, and you don't have to worry about damaging it.

Wipe out the seat area with a rag to make sure everything is clean and free of debris before you put in the new seat

Install the New Seat and Seal

You should lubricate the rubber edge on the seat with some silicon so it slides easily into position, and so it won't get damaged while you are setting it in place.

Slide the seat into place. Slide the pump section back over the shaft and bolt it to the rest of the pump.

Make sure your new compression kit is specifically designed for your industrial pump. Put the compression seal assembly together according to the manufacturer's instructions.

Slide the compression seal assembly onto the shaft and gently set it on the seat.

Reattach the propeller and slide the pump back into the motor. Replace the gasket between the two sections, and then re-bolt the pump and motor section back together. You should check to make sure the gasket that goes between these two sections is still in good shape. If it's damaged, you should replace it.

For more information about compressor seals, go to a site like