3200-632
Aug, 2001
Cornell Pump Company
Page 1 of 2
INSTRUCTIONS FOR MECHANICAL SEAL
JOHN CRANE TYPE 1, TYPE 2, AND TYPE 21 SINGLE MECHANICAL SEAL
For Cornell Solids Handling Pumps
The location of the mechanical seal in your pump is shown in the cross-section drawing of the pump. The
stationary seat is held in the backplate. All other parts of the seal rotate with the shaft and impeller.
STARTING
The seal chamber must be full of liquid before operating the pump. If the shaft is vertical open the vent until
liquid comes out to be sure chamber is full (not necessary for pumps with Cycloseal as seal chamber is self-
venting). CAUTION: DO NOT RUN PUMP DRY unless pump is equipped with Run-Dry option.
MAINTENANCE
No maintenance is required. However, the pump should be examined at regular intervals for leakage resulting
from wear of the sealing faces. Occasionally new installations will leak for a short time. These must be
inspected daily. If the leakage does not reduce to almost zero, the assembly should be examined for proper seal
installation.
SEAL FACE
FACE
DISC DRIVING BAND
SEAT
O-RING SEAT
SPRING
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