F−1031, Section 4209
Page 1 of 7
Rev: 01/03/07
Introduction
This section contains overhaul instructions for Waterous CX Series centrif-
ugal fire pumps. Since several types of transmissions are used with the
CX Series pumps, the transmissions are covered in separate sections be-
ginning with number 4300.
Note that this instruction is written to cover several variations of the CX
Series pumps, not all steps will apply to any one pump.
Also refer to the Service Parts List (SPL documents) furnished with your
pump to aid in further part identification and repair parts ordering.
General Overhaul Information
Tools and Equipment
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. Excessive
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 mate-
rial 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.
Pump Bodies and Impellers
Flush out these components and related parts with clean water. Use a stiff
brush to remove loose scale, caked sediment, etc. Be sure to remove all
traces of old gaskets. 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 maintenance, or from freezing. Replace
defective parts.
Bearings, Gaskets, Seals and O−rings
Parts of this nature are frequently damaged during removal or disassemb-
ly. In addition, they sometimes deteriorate or lose their effectiveness be-
cause 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 un-
der packing or mechanical seals. If scratches are not severe, and are not
under packing and seals, clean them with a fine−cut file. Grooves under
the packing are usually permissible if they are not sharp or too deep. Even
slight longitudinal scratches will cause leaks and should be removed.
