Gardner Denver L4-5C Original User Manual page 57

Inlet Valve (Body) Inspection - The valve does not require maintenance or lubrication. If air/oil leaks
develop across the valve disc during pressurized conditions (e.g., machine stopped), valve seals should
be inspected for wear and tear signs:
1. Be sure the unit is completely off and oil sump is depressurized.
2. Disconnect, lockout and tag out power supply to the compressor package.
3. Close (when provided) valve isolating compressor package from air system.
4. Refer to Figure 9-1 for hardware details.
5. Loosen and remove the air filter element.
6. Remove four bolts securing inlet flange to the compressor body and remove the flange.
7. Remove the poppet assembly and the poppet return spring.
8. Inspect poppet seals (O-rings) for wear and tear.
9. In case of noted malfunction (e.g., valve will not open/close properly with good air signal), unless
a damaged or worn component can be identified and/or repaired, replace the complete inlet valve
assembly.
10. Reinstall inlet valve in reverse order.
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