EBARA EFQT12 - Manual (Page 27)

EBARA Fluid Handling 26
Remove the impeller adjusting shims (65). For
ease of reassembly tie and tag the shims, or
measure and record their thickness.
Seal Disassembly
NOTE!
There is an air filled cavity with an open drain
hole located directly behind the seal plate
(44). If oil escapes from the drain, the seal
plate would be required. The drain hole is
tapped, but installation of a pipe plug is not
recommended.
Before removing the seal, disconnect the feed
tube (88) from the barbed elbow (86) and plug
the tube to stop the flow of oil. Remove the seal
cavity drain plug (90) and drain the cavity. Clean
and reinstall the drain plug.
CAUTION!
Carefully remove the spring, retainer, rotating
and stationary seal elements, and the shaft
sleeve (64), using a stiff wire with a hooked end if
necessary. Be sure to remove the two O-rings
located under the shaft sleeve.
Clean the seal cavity and shaft with a soft cloth
soaked in cleaning solvent.
WARNING!
Most cleaning solvents are toxic and
flammable. Use them only in a well-ventilated
area free from excessive heat, sparks, and
flame. Read and follow all precautions printed
on solvent containers.
If no further disassembly is required, refer to
Seal Reassembly.
Remove the suction piping. Remove the suction
check valve assembly (74) if additional clearance is
required.
Remove the foundation hardware from the elbow
support (60) and pedestal support (46). Tie and tag
any shims used under the supports.
Support the suction elbow using a suitable hoist.
Separate the elbow the pump casing (1) by
removing the cap screws (58), hex nut (52), and lock
washers (51).
WARNING!
Do not attempt to lift the complete pump unit
using the lifting eye. It is designed to
facilitate removal or installation of individual
components only. Additional weight may
result in damage to the pump or failure of
the eye bolt.
NOTE!
To ease removal of the suction elbow the pump
casing, it may be necessary to loosen the wear
plate retaining hardware (10, 11, 51 and 52). If the
wear plate is loosened, the impeller face
clearance will require adjustment. See Pump
Reassembly.
Inspect the wear plate (59) and O-ring (21) for
damage or wear. If the wear plate must be replaced,
remove the rex nuts (49) and lock washers (48) from
the wear plate studs (47). Loosen the jam nuts (11)
and the adjusting screws (10) out until the wear plate
is free. Inspect the O-ring (53) for damage.
To loosen the impeller (2), remove the socket head
cap screw (54), the impeller washer (55), and roll pin
(56).
Install two cap screws in the 3/8-16 UNC tapped
holes located in the impeller hub, and use a gear
puller to slide the impeller from the shaft (30). Retain
the shaft key (57). Replace the impeller if cracked or
badly worn.