EBARA EFQT12 - Manual (Page 30)

EBARA Fluid Handling 29
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause
leakage. If any components are worn, replace
the complete seal; never mix old and new seal
parts. Clean and polish the shaft sleeve, or
replace it if there nicks or cuts on the end.
CAUTION!
This seal is not designed for operation at
temperatures above 160 F. Do not use at
higher operating temperatures. Lubricate the
O-rings and reinstall the shaft sleeve. Be sure
the O-rings are properly positioned and no
damaged during installation.
Lubricate the O-rings and bellows with
petroleum jelly or oil when installing the seal,
and place a drop of light lubricating oil on the
lapped faces. Assemble the seal as shown in
figure 2.
Pump Reassembly
Reinstall the impeller adjusting shims (65).
Reinstall the impeller key (57), and press the
impeller onto the shaft. A clearance of .010 to
.020 inch between the impeller and the seal
plate (44) is necessary for maximum pump
efficiency. If the pump casing has already been
installed, this clearance must be reached by
removing impeller shims until the impeller
binds against the seal plate when the shaft is
turned. After the impeller binds, ass .010 inch
of shims.
NOTE!
If the pump casing has not been secured to
the pedestal assembly, this clearance may
be measured with a feeler gauge and
adjusted accordingly.
After the proper clearance has been attained,
remove the impeller locking devices and clean
the threads tapped in the impeller shaft with
fresh cleaning solvent. Reinstall the impeller
washer (55) and roll pin (56).
Prime the threads of the socket head cap screw
(54) with “Loctite Primer-T” (G-R P/N 18718-
104) and apply four drops of “Loctite 242-
31”adhesive sealant (G-R P/N 18771-040)
around the circumference of the threads, one
inch from the end. Reinstall the socket head cap
screws and torque to 300 ft. lbs.. Recheck the
impeller back clearance.
NOTE!
Secure the pump casing and O-ring (22) to
the seal plate and pedestal assembly if not
already done.
Secure the seal oil sight gauge brackets and
assembled sight gauge components. Reinstall
the oil feed tube (88) to the barbed elbow (86)
and tighten the tubing clamp (89).
If the wear plate (59) was removed, lubricate the
O-ring (53) with petroleum jelly and press the
assembly into the suction elbow and secure.
Replace the wear plate O-ring (21), and
lubricate it with petroleum jelly. Reinstall the
suction elbow and pedestal support (46) to the
pump casing. Secure the elbow supports with
the foundation mounting hardware.
A clearance of .010 to .020 inch between the
impeller and the wear plate is necessary for
maximum pump efficiency. This clearance can
be reached by adjusting the wear plate. Back off
the jam nuts (11) until they contact the heads of
the wear plate adjusting screws (10). Tighten the
adjusting screws evenly, no more than a half
turn at a time, while rotating the impeller shaft
until the wear plate makes contact with the
impeller. Back off each of the adjusting screws a
half turn, and tighten the jam nuts until they are
snug against the suction head. The clearance
should now be correct.
Lubricate the seal as indicated in the
LUBRICATION section.