Goulds Pumps 3409 - IOM - Manual (Page 34)

The oil should be a non-foaming, well refined, good grade,
straight cut, filtered mineral oil. It must be free from water,
sediment, resin, soaps, acid and fillers of any kind.
In installations with moderate temperature changes, low
humidity, and a clean atmosphere, the oil should be changed
after approximately 1000 hours of operation. The oil should be
inspected at this time to determine the operating period before
the next oil change. Oil change periods may be increased up to
2000-4000 hours based on an 8000 hour year. Check the oil
frequently for moisture, dirt or signs of “breakdown,”
especially during the first 1000 hours.
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CAUTION
Do not over oil; this causes the bearings to run hot.
The maximum desirable bearing housing operating
temperature for all ball bearings is 180° F. Should the
temperature of the bearing frame exceed 180° F
(measured by thermometer) shut down pump to
determine the cause.
COUPLING LUBRICATION
Grid or gear tooth couplings (Falk Grid Steelflex or Falk
Crowned Tooth coupling for instance) are initially lubricated
with Falk Long Term Grease (LTG) and do not require
relubrication for up to three years. If coupling leaks grease, or
is exposed to extreme temperatures or excessive moisture,
more frequent lubrication may be required.
Use coupling manufacturer’s recommended grease to provide
trouble free performance.
Flexible couplings (Wood’s Sure-Flex or Falk Torus coupling
for instance) provide smooth transmission of power. There is
no rubbing action of metal against rubber to cause wear.
Couplings are not affected by abrasives, dirt or moisture. This
eliminates the need for lubrication or maintenance, and
provides clean and quiet performance.
If other types of couplings are used, follow maintenance
instructions of coupling manufacturer.
SEALING INFORMATION
PACKING(NON-ASBESTOS)
On packed pumps the packing is installed prior to shipment. All
packings used are the highest grade material. Before pump is put
into operation check the condition of the packing. If pump is
installed within sixty (60) days after shipment the packing will be
in good condition with a sufficient supply of lubrication. If pump
is stored for a longer period it may be necessary to repack the
stuffing box. In all cases, however, we recommend an inspection
of the packing before pump is started.
The standard 3409 pump packing is made from braided acrylic
yarn impregnated with graphite.
A soft, well-lubricated packing reduces stuffing box resistance
and prevents excessive wear on the shaft or shaft sleeve. Many
brands of packing on the market have the desired qualities.
Standard packing is John Crane Style 1340, or equal.
When a pump with fiber packing is first started it is advisable to
have the packing slightly loose without causing an air leak. As the
pump runs in, gradually tighten the gland bolts evenly. The gland
should never be drawn to the point where packing is compressed
too tightly and no leakage occurs. This will cause the packing to
burn, score the shaft sleeve and prevent liquid from circulating
through the stuffing box cooling the packing. The stuffing box is
improperly packed or adjusted if friction in the box prevents
turning the rotating element by hand. A properly operated stuffing
box should run lukewarm with a slow drip of sealing liquid. After
the pump has been in operation for some time, and the packing
has been in operation for some time, and the packing has been
completely run-in, drippage from the stuffing boxes should be at
least 40 to 60 drops per minute. This will indicate proper packing
and shaft sleeve lubrication and cooling.
NOTE: Eccentricity of the shaft or sleeve through the
packing could result in excess leakage that cannot be
compensated for. Correction of this defect is very important.
Packing should be checked frequently and replaced as service
indicates. Six months might be a reasonable expected life,
depending on operating conditions. It is impossible to give any
exact predictions. A packing tool should be used to remove all old
packing from the stuffing box. Never reuse old and lifeless
packing or merely add some new rings. Make sure the stuffing
box is thoroughly cleaned before new packing is installed. Also
check the condition of the shaft or sleeve for possible scoring or
eccentricity, make replacements where necessary.
New packing (non-asbestos) should be placed carefully into the
stuffing box. If molded rings are used, the rings should be opened
sideways and the joints pushed into the stuffing box first. The
rings are installed one at a time, each ring seated firmly and the
joints staggered at about a 90° rotation from each preceding joint.
If coil packing is used, cut one ring to accurate size with either a
butt or mitered joint. An accurately cut butt joint is superior to a
poor fitting mitered joint. Fit the ring over the shaft to assure
proper length. Then remove and cut all other rings to the first
sample. When the rings are placed around the shaft a tight joint
should be formed. Place the first ring in the bottom of the stuffing
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3409 IOM 11/04