National Oilwell Varco Sanitary Pump FA2F

Remove the gland nuts and packing gland from the stuffing box.

Use packing extractors to remove the first two packing rings, the lantern rings, and the last two packing rings.

Inspect the drive shaft for excessive wear or grooves.

Is the drive shaft worn or grooved?

If the drive shaft is not worn, lubricate the 4 new packing rings with packing grease.

Insert two rings of packing onto the shaft.

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 value between 0.011” (.28mm) and 0.050” (1.3mm) under the standard value?

Check the following conditions for rotor renewal eligibility

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

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?

Routine Adjustment and Lubrication

Adjust the packing as necessary

Touch the bearing housing to check for normal operating temperature

Is there a sudden, rapid rise in operating temperature?

Remove the drive shaft and shaft bearings from the bearing housing if temperature rise is detected

Select the maintenance action for the shaft bearings