Maintenance
Model 3410 Installation, Operation, and Maintenance Manual
51
Maintenance
Maintenance schedule
CAUTION:
Shorten the inspection intervals if the pumped liquid is abrasive or corrosive, or if the
environment 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 bearings are running over 180°F (82°C), 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 infiltration of water or other fluid. Saponification gives the grease a whitish color. If
this condition occurs, 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 cages 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
readings 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.
Refer to
Radial clearances
(page 65) for standard clearances.
• Remove any deposit or scaling.