Carbon seal and seating assembly – Hale SMR-U User Manual

Page 11

Section 4

CARBON SEAL AND SEATING ASSEMBLY

When the impeller is removed, the mechanical carbon face seal is accessible for
examination. In the event of excessive leakage past the carbon seal and out of the
drain hole in the pump head, remove impeller per Sections 3. Examine the carbon
seal. If the face of the carbon seal-seating ring is scored, it is essential to replace it
and to fit a new seating ring, which is mounted within the rear face of the impeller.
To remove the carbon seal seating ring, remove two M6 nyloc nuts and washers and
gently remove it, taking care not to lose the wave spring. The stationary carrier may
be left in place if only the wearing faces are being replaced.
The silicon carbide ring fitted in the rear side of the low pressure impeller may be
levered out, by means of a small instrument screwdriver inserted between the ring
and its rubber cup.

Re-assembly of the seal is completed as described below. Please note: Mechanical
Seals are precision-engineered devices and extreme care must be taken to ensure
that no damage occurs to the lapped faces.

Read the fitting instructions before installation of the seal.

Ensure that the lapped faces are absolutely clean throughout the entire installation.
Soiled faces must to be cleaned with appropriate degreasing cleaner

and soft tissue.