Maintenance
Model 3410 Installation, Operation, and Maintenance Manual
52
• Clean out the stuffing box piping.
• Measure the total dynamic suction and discharge head in order to test pump performance
and pipe condition. Record the figures and compare them with the figures of the last test.
This is especially important where the pumped liquid tends to form a deposit on internal
surfaces.
• Inspect foot valves and check valves. A faulty foot or check valve will cause poor
performance. The check valve safeguards against water hammer when the pump stops.
Flood-damaged pumps
If the pump is properly sealed at all joints and connected to both suction and discharge, then it
will exclude outside liquid. Therefore, it is only necessary to service the bearings, stuffing box,
and coupling after flood damage.
Perform the following service on a centrifugal pump after a flooded condition:
• Dismantle the frame, and then inspect the bearings for any rusted or badly worn surfaces.
Clean as necessary. If the bearings are free from rust and wear, then reassemble and
relubricate them with one of the recommended lubricants. Depending on the length of time
the pump has remained in the flooded area, it is unlikely that bearing replacement is
necessary. Only replace the bearings if rust or worn surfaces appear.
• Inspect the stuffing box and clean out any foreign matter that will clog the box. Replace
packing that appears to be worn or no longer regulates leakage properly. Clean and
thoroughly flush mechanical seals.
• Dismantle and thoroughly clean the couplings. Lubricate the couplings where required with
one of the lubricants recommended by the coupling manufacturer.
Bearing maintenance
These bearing lubrication sections list different temperatures of the pumped fluid. If the
pump is ATEX-certified and the temperature of the pumped fluid exceeds the permitted
temperature values, then consult your ITT representative.
Regrease the grease-lubricated bearings
CAUTION:
Grease-lubricated bearings are lubricated at the factory. Do not grease too frequently.
NOTICE:
Risk of equipment damage. Ensure that the grease container, the greasing device, and the
fittings are clean. Failure to do so can result in impurities entering the bearing housing while
regreasing the bearings.
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