Low Oil Level Switch QUINCY COMPRESSOR
112210-101 4 February 1998
Step 2) Isolate the compressor from the compressed air supply by closing
a manual shutoff valve upstream and downstream from the com-
pressor. Display a sign in clear view at the shutoff valve stating that
the compressor is being serviced.
Step 3) Open a pressure relief valve within the pressurized system to allow
the system to be completely depressurized. NEVER remove a plug
to relieve the pressure!
Step 4) Open all manual drain valves within the area to be serviced.
Step 5) Wait for the unit to cool before starting to service. (Temperatures
of 125°F can burn skin. Some surface temperatures exceed 350°F
when the compressor is operating.)
Removing the Low Oil Level Switch
Step 1) Before removing the switch, read and follow the in-
structions listed under Stopping for Compressor
Maintenance (See page 2).
Step 2) Disconnect the switch wires from the motor starter
coil.
Step 3) Drain the oil from the compressor crankcase.
Step 4) Remove the drive belts from the compressor flywheel.
Step 5) Remove the bearing carrier (See Fig. 1). Do not damage
the gasket.
Step 6) Unsnap the float from the base shaft inside the crank-
case (See Fig. 3). Remove the switch base from the
crankcase.
Testing the Low Oil Level Switch
Step 1) Attach a continuity checker (either a 12 volt DC test
light or an ohmmeter) to the switch leads.
Step 2) Hold the switch body with the indicating mark in the
straight up vertical position (See Fig. 2).
Step 3) Reattach the float to the shaft and position the float in
the horizontal (3:00 o’clock position). Raise the float by
rotating the float arm counterclockwise. The switch
contact should be closed. Then lower the float, rotating
the arm clockwise. The switch contact should open
near the horizontal position. If the switch fails to
operate correctly, replace the faulty switch with a
complete switch kit listed on the next page.
Fig. 1
indicating mark
Fig. 2
gasket
bearing carrier
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