3.
Blow-dry the bearings with air that is clean, filtered, and compressed.
Hold the two races together but allow the inner race to rotate a few turns now and then to dislodge
the kerosene from the retainer pockets.
4.
When the bearings are dry, oil the bearings immediately with a good grade of clean machine oil to
prevent corrosion or rust.
6.3.5 Emergency ball bearing replacement
If the outboard-end ball bearing needs replacement and it is not desirable to overhaul the entire pump,
then the bearing can be replaced without disassembling the entire pump. See the Disassembly and Re-
assembly sections for details.
6.3.6 Coupling lubrication
Grid or gear-tooth couplings
Grid or gear-tooth couplings, such as Falk Grid Steelflex or Falk Crowned Tooth coupling, are initially lu-
bricated with Falk Long Term Grease (LTG) and do not require relubrication for up to three years. If the
coupling leaks grease or is exposed to extreme temperatures or excessive moisture, then more frequent
lubrication is required.
Use the grease recommendations from the coupling manufacturer for the best performance.
Flexible couplings
Flexible couplings, such as Wood’s Sure-Flex or Falk Torus coupling, 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, then follow the maintenance instructions provided by the coupling
manufacturer.
6.4 Shaft-seal maintenance
6.4.1 Packed stuffing box maintenance
Check or instruction
Explanation/comment
When starting a pump with fiber packing for
the first time, make sure that the packing is
slightly loose without causing an air leak. As
the pump runs in, gradually tighten the gland
bolts evenly.
Never draw the gland to the point where the packing is compressed
too tightly and no leakage occurs. This will burn the packing, score
the shaft sleeve, and prevent circulation of the liquid that cools the
packing.
Turn the rotating element by hand.
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 runs lukewarm with a slow drip of sealing liquid.
After the pump has been in operation for
some time and the packing is completely run
in, check that the stuffing box leaks at the
rate of 40–60 drops per minute.
This indicates proper packing, shaft sleeve lubrication, and cooling.
NOTICE:
Eccentricity of the shaft or sleeve through the
packing can result in excess leakage. Make sure
that the parts are properly centered.
Check the packing frequently and replace as
service indicates.
Six months is a reasonable expected life, depending on operating
conditions. Use a packing tool in order to remove all old packing from
6.4 Shaft-seal maintenance
Model 3410 Installation, Operation, and Maintenance Manual
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