EBARA EFQT8 - Manual (Page 29)

EBARA Fluid Handling 28
After removing the shaft and bearings, clean and
inspect the bearings in place as follows.
CAUTION!
To prevent damage during removal from the
shaft, it is recommended that bearings be
cleaned and inspected in place. It is strongly
recommended that the bearings be replaced any
time the shaft and bearings are removed.
Clean the bearing housing, shaft and all
component parts (except the bearings) with a
soft cloth soaked in cleaning solvent. Inspect the
parts for wear or damage and replace as
necessary.
WARNING!
Most cleaning solvents are toxic and
flammable. Use them only in a well-ventilated
area free form excessive heat, sparks, and
flame. Read and follow all precautions
printed on solvent containers.
Clean the bearings thoroughly in fresh cleaning
solvent. Dry the bearings with filtered
compressed air and coat with light oil.
CAUTION!
Bearings must be kept free of all dirt and foreign
material. Failure to do so will greatly shorten
bearing life. DO NOT spin dry bearings. This may
scratch the balls or races and cause premature
bearing failure.
Rotate the bearings by hand to check for
roughness or binding and inspect the bearings
balls. If rotation is rough or the bearing balls are
discolored, replace the bearings.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the bearing
housing. Replace the bearings, shaft, or bearing
housing if the proper bearing fit is not achieved.
If bearing replacement is required, remove the
outboard bearing retaining ring (14), and use a
bearing puller to remove the bearings from the
shaft.
Seal Removal
(Figure 2)
Remove the seal spring. Slide the sleeve and rotating
portion of the seal off the shaft as a unit. Apply oil to
the sleeve and work up under the bellows. Slide the
rotating portion of the seal off the sleeve.
Remove the seal sleeve o’ring.
An alternate method of removing the stationary seal
components is to remove the hardware, and
separate the seal plate (21) and gasket (2) from the
bearing housing (5). Position the seal plate on a flat
surface with the impeller side down. Use a wooden
dowel or other suitable tool to press on the back
side of the stationary seat until the seat, O-rings,
and stationary element can be removed.
If no further disassembly is required, refer to seal
installation.
Shaft and Bearing Removal and Disassembly
(Figure 2)
When the pump is properly operated and
maintenance, the bearing housing should not
require disassembly. Disassemble the shaft and
bearings only when there is evidence of wear or
damage.
CAUTION!
Shaft and bearing disassembly in the field is not
recommended. These operations should be
performed only in a properly equipped shop by
qualified personnel.
Remove the bearing housing o-ring (17).
Remove the bearing housing drain plug (7) and
drain the lubricant. Clean and reinstall the drain
plug.
Disengage the hardware (15 and 16) and slide the
bearing cap (10) and oil seal (13) off the shaft.
Remove the bearing cap gasket (9), and press the
oil seal from the bearing cap.
Place a block of wood against the impeller end of
the shaft and tap the shaft and assembled bearings
from the bearing housing.