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E. MAINTENANCE TIME TABLE:
EVERY MONTH
EVERY 3
MONTHS
EVERY 6
MONTHS
EVERY YEAR
NOTE: The above timetable is based on the assumption that after startup, the unit had been regularly
monitored and such a schedule was found to be consistent with operation, as shown by stable readings.
Extreme or unusual applications or conditions should be taken into consideration and may require
shorter maintenance intervals.
F. TROUBLE SHOOTING
Between regular maintenance inspections, be alert for signs of motor or pump trouble. Common
Check bearing temperature with a thermometer, not by hand. If bearings are
running hot (over 82°C), it may be the result of too much lubricant. If changing
the lubricant does not correct the condition, disassemble and inspect the
bearings.
Check the oil on oil lube units. Check grease lubricated bearings for
saponification. This condition is usually incurred by the infiltration of water or
other fluid past the bearing shaft seals and can be noticed immediately upon
inspection, since it gives the grease a whitish colour. Wash out the bearings
with a clean industrial solvent and replace the grease with the proper type as
recommended.
Check the packing and replace if necessary. Use the grade recommended. Be
sure the lantern ring is centred in the stuffing box at the entrance of the stuffing
box piping connection.
Check shaft or sleeve for scoring. Scoring accelerates packing wear.
Check alignment of pump and motor. Re-shim motor if necessary. If
misalignment recurs frequently, inspect the entire piping system. Unbolt piping
at suction and discharge flanges to see if it springs away, thereby indicating
strain on the casing. Inspect all piping supports for soundness and effective
support of load.
Remove the rotating element. Inspect thoroughly for wear, and order
replacement parts if necessary.
Check impeller clearance.
Remove any deposit or scaling. Clean out stuffing box piping.
Measure total dynamic suction and discharge head as a test of system piping.
Record the figures and compare them with the figures of the last test. This is
important, especially where the fluid being pumped tends to form a deposit on
internal surfaces. Inspect foot valves and check valves, especially the check
valve which safeguards against water hammer when the pump stops. A faulty
foot or check valve will reflect also in poor performance of the pump while in
operation.
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