Service manual

Note: This page was added because of the prevalence of seal damage and leakage

caused by not venting the seal chamber before putting a pump in service.

Seal Chamber Priming for Pumps with Seal Vents:

Fill mechanical seal chamber with liquid to insure seal does not start dry. This can be done by

removing seal vent set-screw and pouring fluid into seal vent before opening pump inlet.

Alternately, seal chamber can be vented in situations where inlet pressure is above atmospheric

by opening inlet and discharge valves and then loosening seal vent plug to allow positive inlet

pressure to push air out of seal chamber until oil flows from it. See Figure Below.

Seal Chamber Priming for 3E Model Pumps with Mechanical Seals:

For the Imo 3E Model pumps with mechanical seals, there is no seal vent port. The mechanical

seal in these model pumps is located in the discharge chamber of the pump and is in the fluid

flow path. In these model pumps the complete pump must be filled and vented of any trapped

air prior to starting the pump. Contact the factory if you have questions. See Figure 8 on page

12 and Figure 12 on page 18 of this manual for suction piping and pump filling methods.

Filling or Venting Seal Cavity Using Seal Vent

CAUTION

- Failure to fill or vent seal chamber as described above may cause damage to seal

running faces which may result in seal leakage.