6 Maintenance
6.1 Maintenance schedule
CAUTION:
Shorten the inspection intervals if the pumped liquid is abrasive or corrosive, or if the environ-
ment is classified as potentially explosive.
NOTICE:
This timetable assumes that the unit has been constantly monitored after startup. Adjust the
timetable for any extreme or unusual applications or conditions.
Monthly inspections
Check the bearing temperature with a thermometer. Do not check the temperature by hand. If the bear-
ings are running over 82°C | 180°F, then there is too much or too little lubricant.
If changing the lubricant or adjusting to the proper level does not correct the condition, then disassemble
and inspect the bearings.
Three-month inspections
Perform these tasks every three months:
•
Check the oil on oil-lubricated units.
•
Check the grease-lubricated bearings for saponification. This condition is usually caused by the in-
filtration of water or other fluid. Saponification gives the grease a whitish color. If this condition oc-
curs, then wash out the bearings with a clean industrial solvent and replace the grease with the
proper type as recommended.
Six-month inspections
Perform these tasks every six months:
•
Check the packing and replace if necessary. Use the grade recommended. Make sure the seal cag-
es are centered in the stuffing box at the entrance of the stuffing box piping connection.
•
Take vibration readings on the bearing housings. Compare the readings with the last set of read-
ings to check for possible pump component failure.
•
Check the shaft or shaft sleeve for scoring. Scoring accelerates packing wear.
•
Check the alignment of the pump and driver. Shim the units if necessary. If misalignment reoccurs
frequently, then inspect the entire piping system. Unbolt the piping at the suction and discharge
flanges to see if it springs away, which indicates strain on the casing. Inspect all piping supports for
soundness and effective support of load. Correct as necessary.
Annual inspections
Perform these inspections one time each year:
•
Remove the upper half of the casing. Inspect the pump thoroughly for wear. Order replacement
parts if necessary.
•
Check the wear ring clearances. Replace the wear rings when clearances become three times their
normal clearance or when you observe a significant decrease in discharge pressure for the same
flow rate.
6 Maintenance
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Model 3409 Installation, Operation, and Maintenance Manual
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