EBARA EFQT3 - Manual (Page 28)

EBARA Fluid Handling 28
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 wedging 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.
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.
NOTE
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.
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.
TEE
APPROX. 14 IN.
(356 MM) LONG
APPROX. 6 IN.
(152MM) LONG