EBARA EFQT8 - Manual (Page 28)

EBARA Fluid Handling 27
Figure 3. Rotation Assembly Removal
Impeller Removal
(Figure 2)
Unscrew the impeller (1) in a counterclockwise
direction when facing the impeller. Use caution
when unscrewing the impeller; tension on the
shaft seal spring will be released as the impeller
is removed.
Remove the impeller adjusting shims. Tie and
tag the shims or measure and record their
thickness for ease of reassembly.
(Figure 2)
The impeller (1) should be loosened while the rotating
assembly is still secured to the pump casing. Before
loosening the impeller, remove the seal cavity drain
plug (6) and drain the seal lubricant. This will prevent
the oil in the seal cavity from escaping when the
impeller is loosened. Clean and reinstall the seal
cavity drain plug.
Immobilize the impeller by weding a block wood
between the vanes and remove the impeller capscrew
and washer (23 and 24). Install a lathe dog on the
drive end of the shaft (11) with the “V” notch
positioned over the shaft keyway. Strike the lathe dog
sharply in a counterclockwise direction (when facing
the drive end of the shaft). When the impeller breaks
loose, remove the lathe dog and wood block.
(Figure 1)
Remove the inner hardware (14 and 15) from the
casing ring. Install three of the inner cap screws in the
jacking holes in the casing ring, and use them to press
the rotating assembly into the pump casing until the
bearing housing is free.
Remove the jacking screws from the casing ring (18).
Remove the outer hardware and shim sets (16 and
17), and separate the casing ring from the pump
casing. Tie and tag the shim sets for ease of
reassembly.
An optional disassembly tool for removing and
installing the rotating is available from the
factory. If the tool is used, follow the instructions
packed with it. If improvised tools are used, be
sure they are heavy enough for safe use and will
not damage the pump.
After the rotating assembly is loosened, screw a
5/8-18 UNF X 16-inch long threaded rod into the
impeller shaft. Support the drive end with
another set of handles, or a length of pipe (1-
13/16 inch [46mm] minimum I.D), and slide the
complete rotating assembly through the back
cover opening (see Figure 3). Move the rotation
assembly to a clean work area before
proceeding with disassembly.
ADD PIPE
AS REQUIRED