National Oilwell Varco Sanitary Pump FA1G

Measure the rotor crest-to-crest diameter

Enter the standard crest-to-crest diameter value for comparison

Is the measured diameter within 0.010” (.25mm) of the standard value and free of deep nicks, gouges, or other surface defects?

Is the crest-to-crest diameter between 0.011” (.28mm) and 0.050” (1.3mm) under the standard value?

Check the following conditions for rotor renewal by chrome plating

Routine Adjustment and Lubrication

Adjust the packing as necessary

Bearing Temperature Familiarization

Touch the bearing housing to become familiar with normal operating temperature

Is there a sudden, rapid rise in operating temperature?

If temperature rise is detected

Remove the drive shaft and shaft bearings from the bearing housing

Rotate the bearings slowly and check for smoothness and even action.

Is there any doubt concerning the complete serviceability of the bearings?

Inspect the drive shaft for defects

Does the drive shaft need replacement?

Adjust gland nuts for a leakage rate of 1 to 2 drops per second

Is the leakage rate within 1 to 2 drops per second after 15 minutes?

Is there excessive leakage from the stuffing box after 15 minutes?

Tighten the gland nuts until a desired leakage rate is obtained

Consult with Moyno authorized service representative if zero leakage is required

Check all components for wear and tear

Ensure all components are clean and handled with care

Pack the bearings with lubricant before assembly into the bearing housing

Lubricate the packing rings during assembly

Add additional grease through the zerk fitting in the packing retainer after assembly