Bell & Gossett AC8584D Series HSCS Base Mounted Centrifugal Pumps - Manual (Page 19)

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EVERY MONTH Check bearing temperature with a thermometer, not by hand. If bearings are running hot (over
180ºF), it may be the result of too much lubricant. If changing the lubricant does not correct the
condition, disassembly and inspect the bearing. Lip seals bearing on the shaft may also cause the
housing to run hot. Lubricate lip seals to correct.
EVERY 3 MONTHS Check the oil on oil lubricated units. Check grease lubricated bearings for saponification. This
condition is usually caused by the infiltration of water or other fluid passing the baring shaft
seals and can be noticed immediately upon inspection, since it gives the grease a whitish color.
Wash out the bearings with a clean industrial solvent and replace the grease with the proper type
as recommended.
EVERY 6 MONTHS Check the packing and replace if necessary. Use the grade recommended. Be sure the lantern rings
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 failure (e.g. bearings)
Check shaft or shaft sleeve for scoring. Scoring accelerates packing wear.
Check alignment of pump and motor. Shim up units if necessary. If misalignment reoccurs
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. Correct as necessary.
EVERY YEAR Remove the upper half of the casing. Inspect the pump thoroughly for wear, and order replacement
parts if necessary.
Check wear ring clearances. Replace when clearances become three (3) times their normal clear-
ance or when a significant decrease in discharge pressure for the same flow rate is observed. See
Engineering Data Section for standard clearances.
Remove any deposit or scaling. Clean out stuffing box piping.
Measure total dynamic suction and discharge head as a test of pump performance and pipe
condition. 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.
56;,! The above time table is based on the assumption that after start-up, the unit had been constantly 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 when establishing the maintenance intervals.
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