Quincy Compressor 255

Ensure the compressor is disconnected from the power supply

Verify that all safety precautions from SECTION 5, Stopping For Maintenance, are followed

Remove the pressure switch cover

Record the current air pressure reading

Adjust the spring loaded adjustment screw

Record the new air pressure reading

Disconnect & lockout the compressor from the power source (electric models) or disconnect the spark plug wire from the spark plug (gas engine models).

Is the compressor stored in a heated area if subjected to freezing temperatures?

Enter the current air pressure in the tank (PSIG).

Is the air pressure in the tank 30 PSIG or less?

Reduce the air pressure in the tank to 30 PSIG by pulling the pressure relief valve ring.

Open the drain valve and allow the moisture and air mixture to drain from the tank.

Measure the span length of the drive (in inches)

Calculate the required deflection (in inches)

Lay a straightedge across the top outer surface of the drive belt from pulley to sheave

Apply pressure with a belt tension gauge and record the deflection force reading

Is the deflection force reading within the minimum and maximum values?

Adjust the belt(s) if the deflection force reading is not within the specified range

Tension new belts to the maximum value plus 33% (multiply by 1.33)

Change oil if 1000 hours or 6 months have passed, whichever occurs first

Was the oil changed more frequently due to harsher conditions?

Inspect compressor valves for leakage

Inspect compressor valves for carbon build-up

Crankcase and Oil Sump Strainer Cleaning

Clean the oil sump strainer screen inside the crankcase with a safety solvent

Measure Span Length and Deflection

Measure the span length of the drive (in inches)

Calculate the required deflection (in inches) by multiplying the span length by 0.016

Measure and Adjust Belt Tension

Lay a straightedge across the top outer surface of the drive belt from pulley to sheave

Apply pressure with a belt tension gauge and record the deflection force reading

Is the deflection force reading within the minimum and maximum values?

Adjust the belt(s) if the deflection force reading is not within the specified range

For new belts, tension to the maximum value plus 33%