If the bearings are lubricated from main pressure,
close the lubricating valve after the pump is started.
If the pump operates automatically and has a
lubrication-delayed solenoid valve, wait 1 minute before checking the lubricating valve
for proper operation. Check operation of the solenoid valve and check the packing for
Check the pre-lubrication control on pumps that have
safety controls to prevent starting before lubrication water is turned on. Make sure that
this water flows to the bearings when the equipment is supposed to function.
Check the time-delay relay for proper functioning, and
compare with the manufacturer's recommendation.
Clean and lubricate the guides and linkages.
Impeller Adjustment. Every 3 months, check the impeller for
maximum efficiency setting and adjust if necessary. On hollow-shaft motors, the
adjustment nut is on the top of the motor. Consult the manufacturer's manual for the
detailed adjustment procedure.
Impeller Fitting. When the pump is pulled for inspection, note
signs of pitting or wear on the impellers.
Cavitation. Pitting in the lower stages may be from
Sand Erosion. Sand in the water erodes the impellers. If
sand is the cause of difficulty, check the well screen and replace if necessary. Where
the erosion effect is appreciable, repair or replace impellers that are not likely to last
until the next inspection.
Clearances. Repair or replace impellers, as necessary, to
maintain the close clearance required for pump efficiency. See the manufacturer's
manual regarding pump clearances and efficiencies.
Bowls and Waterways. When the pump is pulled for inspection,
inspect the bowls and water passage for pitting, wear, and corrosion.