Maintenance
4. With wrenches, disconnect the Aeroquip coupling in the supply line between the oil
separator and the inlet side of the adsorber. This keeps the adsorber pressurized.
5. Locate the adapter fitting; be sure its valve is closed. Move the part of the supply line
fastened to the adsorber out of the way. Using two wrenches, connect the adapter fitting to
the female Aeroquip coupling on the supply line from the oil separator.
6. Slowly open the valve on the adapter fitting. Vent the system to atmospheric pressure.
Close the valve on the adapter fitting.
7. Remove the adapter fitting.
8. Perform the required maintenance.
Do not reconnect the adsorber if the compressor has been vented to
atmospheric pressure.
This completes the procedure to vent the compressor to atmospheric pressure.
Gas Cleanup
Tools required: 2 Adapter fittings with valves, P/N 255919B2 or P/N 266395C
Open end wrenches 1", 1 1/8", 1 3/16"
Helium gas cylinder with pressure regulator and charge line
Gas cleanup is required if the compressor’s interior has been opened to the atmosphere or the
equalization pressure is 140 kPa (20 psig) or lower. Gas cleanup is performed with the
compressor disconnected from the other system components. The adsorber must be
disconnected unless it also has been opened to the atmosphere or its charge pressure is less
than 140 kPa (20 psig).
If the compressor’s interior has been exposed to the atmosphere for an
extended period, gas cleanup may not suffice to guarantee system gas
purity. Adsorber replacement will be required.
1. Disconnect the gas lines from the compressor. Screw dust plugs into the disconnected gas
line couplings.
2. Locate two adapter fittings. Be sure their valves are closed. Attach them to the supply and
return Aeroquip couplings on the compressor.
If the adsorber has been disconnected, connect a P/N 266395C adapter
fitting to the supply line from the oil separator, instead of connecting to
the supply gas coupling, for venting during this procedure.
3. Connect a charge line to the pressure regulator of a helium gas cylinder containing 99.995%
pure helium gas with a dew point less than -50° C (-58° F) at 2070 kPa (300 psig). Adjust
the gas cylinder pressure regulator to 35 kPa (5 psig).
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