Delta Electronics Air Compressor 66-750

Motor Pulley/Flywheel alignment

The air compressor flywheel and motor pulley must be in-line (in the same plane) within 1/16"" to assure belt retention within flywheel belt grooves. To check alignment, perform the following steps:

1. Unplug air compressor from power source.

3. Place a straightedge against the outside of the flywheel and the motor drive pulley.

4. Measure the distance between the edge of the belt and the straightedge at points A1 and A2 in figure. The difference between measurements should be no more than 1/16"".

5. If the difference is greater or less than 1/16"" loosen the set screw holding the motor drive pulley to the shaft and adjust the pulley’s position on the shaft until the A1 and A2 measurements are within 1/16"" of each other.

6. Tighten the motor drive pulley set screw to 70-80 in.-lbs.

7. Visually inspect the motor drive pulley to verify that it is perpendicular to the drive motor shaft. Points B1 and B2 of Figure should appear to be equal. If they are not, loosen the set screw of the motor drive pulley and equalize B1 and B2, using care not to disturb the belt alignment performed in step 2.

1. Remove the oil fill plug (A).

2. Remove the oil drain plug (B) and drain oil into a suitable container.

3. Replace the oil drain plug (B) and tighten securely.

4. Slowly fill crankcase to the top of the fill hole.

5. Replace oil fill plug (A) and tighten securely.;

1. Remove the oil fill plug (A). The oil level should be even with the top of the fill hole and no lower than 6 threads from the top of fill hole.

2. If needed, slowly add oil until it reaches the top of fill hole.

Unusual Noise and/or Vibration;

1. Set the On/Auto/Off lever to “OFF”.

3. Remove the air tool or accessory.

4. Open the globe valve and allow the air to slowly bleed from the air tank until tank pressure is approximately 20 psi.

6. Drain water from air tank by opening drain valve (counter-clockwise) on bottom of tank.

7. After the water has been drained, close the drain valve (clockwise). The air compressor can now be stored.;

Air compressor pump intake and exhaust valves

Once a year have a Trained Service Technician check the air compressor pump intake and exhaust valves.

Inspect Air Lines and Fittings for Leaks

1. Turn the air compressor on to inspect for air leaks.

2. Apply a soap solution to all air line fittings and connections/piping.