Page 44 - Air-Lakeside FSR PM

"Oil-Less” Medical Air Medical Systems

6.0 Inspection/Replacement Procedures

6.4 Replacing the Air Valve Assembly (See Figure 6-6)
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.

1. Turn the H-O-A Switch OFF on the compressor being serviced and lock open the appropriate disconnect
switches.

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 the
other operating compressors.

4. Remove the four (4) outer hex head bolts and the smaller center bolt on top of
the cylinder head. Remove cylinder head.

5. Remove the air valve and gasket.

6. Inspect the air valve for dirt or warping. Repair or replace parts as necessary.

7. Remove unloader bushing, unloader piston and unloader spring from cylinder
head. Examine unloader bushing bore for wear and replace as necessary.
Examine unloader piston for wear and replace as necessary. Replace o-ring and

lubricate with Krytox-6PL205 *.

8. Reverse steps to reassemble the compressor. Replace old gasket. Make sure that
the piston is at the bottom of the cylinder when assembling the air valve.
Note: In reassembling the compressor, the recommended torque for the four
hex head bolts is 41 ft-lb. The recommended torque for the center bolt
on top of the cylinder head is 177 in-lb.
Fig. 6-6 Air Valve Disassembly

*Krytox-6PS205 is a registered trademark of E.I. DuPont DeNemours and Company

6-8