EBARA EFQT-2 - Manual (Page 28)

EBARA Fluid Handling 27
NOTE
An optional disassembly tool is available
from the factory. If the tool is used, follow the
instructions packed with it. A similar tool may
be assembled using ½ inch pipe (schedule 80
steel or malleable iron) and a standard tee
(see Figure 4).All threads are ½ inch NPT. Do
not pre-assemble the tool.
TEE
APPROX. 14 IN.
(356 MM) LONG
APPROX. 6 IN.
(152MM) LONG
Figure 4. Rotating Assembly Tool
To install the tool, remove the air vent (8,
Figure 2) from the bearing housing, and
screw the longest length of pipe into the vent
whole until fully engaged. Install the tee, and
screw the handles into the tee. Use caution
when lifting the rotating assembly to avoid
injury to personnel or damage to the
assembly.
Remove the bearing housing and seal plate O-
rings (9 and 4).
Impeller Removal
(Figure 2)
With the rotating assembly removed from the
pump casing, unscrew the impeller from the
shaft. Use caution when unscrewing the impeller;
tension on the shaft seal spring will be released
as the impeller is removed. Inspect the impeller
and replace if cracked or badly worn.
Remove the impeller adjusting shims tie and tag
the shims, or measure and record their thickness
for ease of reassembly.
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 (24) 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 the pump casing, and remove
the impeller cap screw and washer (10 and 12).
Install a lathe dog on the drive end of the shaft (17)
with the “V” notch positioned over the shaft keyway.
With the impeller rotation still blocked, see Figure 3
and use a long piece of heavy bar stock to pry against
the arm of the lathe dog in a counterclockwise
direction (when facing the drive end of the shaft). Use
caution not to damage the shaft or keyway. When the
impeller breaks loose, remove the lathe dog and wood
block.
NOTE
Do not remove the impeller until the rotating assembly
has been removed from the pump casing.
Turn
Counterclockwise
Lathe Dog Arm
Heavy Bar Stock
Set Screw
Lathe Dog
Impeller Shaft
Shaft Keyway
"V" Notch
Figure 3. Loosening impeller
(Figure 1)
Remove the hardware (13 and 14) securing the
rotating assembly to the pump casing. Separate the
Rotating assembly by pulling straight away from the
pump casing.