Quincy QSI-90, Instruction Manual

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Section V - Servicing
Shaft Seal
Compressor shaft seals are wear
items that may eventually have to be
replaced. Special tools and a complete
understanding of the installation procedure
are required for a successful seal
replacement. Ask your Quincy distributor
for complete illustrated instructions
(available as a Service Alert) at the time
you order the seal and special tools, if you
decide to replace the seal yourself. If your
distributor does not have a copy of these
instructions, they can be ordered from
Quincy Compressor
® at no charge.
QSI compressors incorporate a fl uid
scavenge system to complement the use
of a triple lip seal assembly. Any complaint
of shaft seal leakage requires that the
scavenge system be inspected for proper
operation prior to the replacement of the
shaft seal. Proper inspection consists of
the following:
Assure that the scavenge line itself is
♦
not plugged.
Inspect the performance of the
♦
scavenge line check valve by removing
the fitting located at the bottom of
the motor adapter. Remove the check
ball and inspect for wear. If the check
valve is stuck open, fluid can backflush
from the airend into the seal cavity and
appear as a leak. If the check valve
is stuck closed the seal cavity will not
scavenge. Replace if necessary.
Remove the four bolts securing the seal
♦
adapter to the suction housing.
Insert two of the seal adapter retaining
♦
bolts into the seal adapter jack holes
and turn clockwise (pushing the seal
adapter away from the suction housing).
After the seal adapter outer o-ring has
♦
cleared the seal adapter bore, remove
the adapter for inspection.
Disassemble the seal adapter as
♦
follows:
a. With the face of the seal
adapter up, insert two small, fl at
screwdrivers under the outer lip of
the fl uid slinger and pop the slinger
from the seal adapter bore.
b. Using a brass drift, tap the shaft
seal assembly from the seal bore.
c. Inspect both seal lips for excessive
wear, lip fl aws or damage.
d. Inspect the outer o-ring on the fl uid
slinger for cuts or nicks.
e. Inspect the outer o-ring on the seal
adapter for cuts and nicks.
f. Slide the wear sleeve removal tool
over the end of the shaft and allow
the jaws of the tool to snap on
the backside of the wear sleeve.
Tighten the outer shell of the tool
down over the inner jaws.
g. Using a ratchet and socket, turn
the puller jack screw clockwise in
against the end of the compressor
shaft to remove the seal wear
sleeve.
CAUTION!
Do Not use an impact wrench with this
tool.
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