Page 151 - Med Plaza and Cancer Center

"Oil-Less” Medical Air Medical Systems

6.0 Inspection/Replacement Procedures

6.5 Checking/Replacing Piston Ring, Rider Ring and Gaskets

WARNING:
To protect the lives of patients, always notify the appropriate medical facility staff before performing any
maintenance or service procedures on the air system. Compressed air levels may be affected during
maintenance or service procedures.

WARNING:
Turn off all electrical power to the compressor that is being serviced to prevent electrical shock hazard.

Piston and rider rings must be checked periodically (refer to Section 5.1 Preventive Maintenance Schedule) for
wear and/or damage. The following procedure details how to check the piston and rider rings and replace
them if necessary.

1. Lock out power and turn the H-O-A Switch OFF on the compressor being serviced.

2. Close the isolation (shutoff) valve of the compressor being serviced. Relieve pressure from the
compressor.

Note: Closing the isolation (shutoff) valve of the compressor being serviced allows other compressors to
continue to operate without allowing a backflow of pressure into the serviced compressor.

3. Disconnect intake, discharge
and unloader air lines on the
compressor being serviced.
Isolate intake with a cap or
plug to prevent room air
from entering other operating
compressors.

4. Remove the four (4) nuts that
secure the cylinder to the
crankcase and lift the
cylinder off, exposing the
piston.

5. Remove piston and rider rings from the piston, taking care to note their position in order to ensure that if
they are to be reinstalled, they are reinstalled on the same piston and in the same position as they were
originally.

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