Quincy Compressor QSI 50, Инструкция, Страница: 75 / 92

Instruction book
2012 2039 28 75
Operating
Operate the safety valve by unscrewing the cap one or two turns and retighten it
Testing
Before removing the valve, depressurise the compressor.
See section Problem solving .
Valve (SV) can be tested on a separate airline. If the valve does not open at the set pressure stamped on the
valve, it needs to be replaced.
Warning
No adjustments are allowed. Never run the compressor without safety valve.
7.6 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.
QGV compressors incorporate a fluid scavenge system to complement the use of a double 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 piston located on the valve
attached to the inlet valve. Inspect the O-rings and replace if required. 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 coupling guards and coupling halves.

Remove the drive coupling hub and key from the compressor shaft.

Remove the drive motor.

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, flat screwdrivers under the outer lip of the fluid
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 flaws or damage.
d) Inspect the outer O-ring on the fluid 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.