Casing Maintenance. Keep the waterways clean and clear of rust. When
the unit is dismantled, clean and paint the waterway with a suitable paint that will
adhere firmly to the metal. A routine program of cleaning and repainting helps prevent
complete erosion of the protective coat before replacement.
Pump Shutdown. When a pump is shut down for an extended period, or
for overhaul inspection and maintenance, the following procedures apply:
Shut off all valves on suction discharge, waterseal, and priming
lines. Drain the pump completely by removing vent and drain plugs until the water has
run off. This operation protects against corrosion, sedimentation, and freezing.
Disconnect the switch to the motor and remove the fuses.
Drain the bearing housing. If the shutdown is to be followed by an
inactive period, purge all the old grease. Otherwise, refill with fresh grease. If an
overhaul is scheduled, do not refill the oil or grease receptacles until the pump is
Overhaul Procedures. The frequency of complete overhaul depends on
the hours of pump operation, the severity of service conditions, the construction
material of the pump, and the care the pump receives during its operation. If the pump
is not operated continuously, opening the pump for inspection is not necessary unless
there is definite evidence that the capacity has fallen off excessively, or if there is an
indication of trouble inside the pump or in the bearings. In general, it is good practice
to dismantle pumps in relatively continuous operation once a year. Because pump
designs and construction vary from model to model, and from one manufacturer to
another, there is no set of specific procedures for dismantling and reassembling.
Rules (a) through (d) below are basic. For detailed procedures, consult the
Use extreme care in dismantling the pump to avoid damaging
internal parts. For convenience in reassembly, lay out all parts in the order they are
removed. Protect all machined faces against metal-to-metal contact and corrosion. Do
not remove ball bearings unless absolutely necessary.
While the pump is dismantled, examine the foot valve and check
valve to make sure they are seating and functioning properly.
To assemble the pump, reverse the dismantling procedure. Follow
the manufacturer's manual explicitly.