F-1031, Section 4214
Page 2 of 10
Tools and Equipment
General Overhaul Information
Pump Bodies and Impellers
The following tools and equipment are needed to overhaul a pump:
1. Usual automotive mechanic's hand tools.
2. An arbor press for assembling or disassembling components.
3. An engine lathe for turning impeller hubs.
4. A suitable hoist and slings.
5. Torque capability up to 325 lb-ft.
While no special tools and equipment are required, a few special items are
illustrated or described so the mechanic can make them or they are avail-
able from the apparatus manufacturer or the Waterous Company. These
special items are not absolutely necessary, but they will make the me-
chanic's work much easier.
Preliminary Testing
Before disassembling a pump, test it thoroughly, if possible, and record
the results. A comparison of this test with periodic tests recommended in
form F-1031, Section 1000 can often reveal specific pump troubles. Ex-
cessive speed, for instance, indicates that impellers and/or wear rings are
probably worn.
Cleaning
The continued satisfactory operation of a pump depends to a great extent
upon the cleanliness of its internal parts. Sand, dirt or other abrasive
material will wear bearings, gears and related parts. Before disassembling
a pump for repairs, be sure to clean its exterior. Make sure the working
space, benches and tools are clean. Use only clean, lint-free cloths to
wipe off components. Before reassembling a pump or its components, be
sure to clean them thoroughly.
Flush out these components and related parts with clean water. Use a stiff
brush to remove loose scale, caked sediment, etc. Examine pump bodies,
covers, adapters and fittings for cracks, severe corrosion or other damage.
Almost all damage to these parts results from improper use or mainte-
nance, or from freezing. Replace defective parts.
Bearings, Gaskets, Seals and O-rings
Parts of this nature are frequently damaged during removal or disas-
sembly. In addition, they sometimes deteriorate or lose their effectiveness
because of age or misuse. Replacing these parts whenever overhauling a
pump is a good policy.
Impeller Shafts
Examine shaft for severe scratches, grooves or corrosion - especially
under packing or mechanical seals. If scratches are not severe, and are
not under packing and seals, clean them with a fine-cut file. Grooves are
usually permissible if they are not sharp or too deep. Even slight longitu-
dinal scratches will cause leaks and should be removed.
Installing Ball Bearings
Most Waterous pumps are designed so that ball bearings fit tightly on their
shafts and have relatively loose fits in the bearing housings. When
mounting these bearings on shafts, always apply force to the inner races.
When bearings have a tight fit in the housings, and a heavy force is nec-
essary to install them, be sure to apply force only to the outer bearing
races. For either type of fit, applying force to the wrong bearing race may
damage the balls and race.
