Goulds Pumps HS - IOM - Manual (Page 18)

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HS IOM 5/08
NOTE: Do not overtighten gland nuts. Packing may
set permanently and require removal. Overtightened
packing causes excessive friction between packing and
sleeve, and will result in damaged components. A
noticeable temperature increase in stuffing box would
indicate insufficient lubrication.
k. Periodic maintenance is absolutely required for all
packed pumps.
Normal shaft run-out should be under .005” to avoid
pounding of stuffing box packing. With excessive
shaft run-out, shaft straightening or replacement is
necessary.
3. Mechanical Seals Most mechanical seals are installed
and adjusted at the factory. Due to size and design,
some installed mechanical seals are supplied with
shipping retainers. Shipping retainers hold the sealing
faces apart to avoid damage during transport. Shipping
retainers must be removed before shaft is to be rotated.
Pumps with retained seal faces will be specially
marked and instructions from the seal manufacturer for
retainer removal will be provided.
Mechanical seals have a stationary and a rotating
sealing face. Commonly, these sealing rings are of
carbon and ceramic material, brittle in nature, and
easily damaged. As the sealing rings seat with the
operation of the pump, a compatible wear pattern
develops between the mating surfaces. To disassemble
the mechanical seal after the wear pattern is established
would necessitate the replacements of the rotating and
stationary sealing elements. Do not replace only one
component.
To insure the life and sealing characteristics of the
mechanical seal, lubricating liquid must be circulated
through the stuffing box. Clear, grit-free liquid is
necessary.
Special seal information and replacement seal elements
should be provided by the seal manufacturer. Goulds
strongly recommends the stocking of replacement
sealing elements.
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CAUTION
Do not make shaft adjustments on mechanical seal
installations without consulting seal instructions and
pump assembly drawing.