F-1031, Section 4202
Page 3 of 10
Introduction
This section contains overhaul instructions for Waterous CG Series centrif
ugal fire pumps. Since several types of transmissions are used with the
CG 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 CG
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 Description
The CG series pumps are single stage centrifugal pumps. Depending on
the type of transmission used, the pump may be used as a front-mounted
pump (driven from the engine crankshaft), power take-off driven, direct-en
gine driven (bellhousing mounted) or midship mounted. They are available
in capacities up to 750 gpm (2850 l/m). The CGVG is a midship or PTO
mounted pump with a curved intake cross pipe. CGN (not available after
4/21/06) pumps are front-mounted, direct-engine mounted or PTO-driven
with a 5 inch flanged intake fitting. CGV pumps are front, direct-engine
mounted to PTO driven with a Victaulic
r
intake fitting. CGR (not available
after 4/21/06) pumps are front-mounted, direct-engine mounted or PTO-
driven with a threaded intake fitting.
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. 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 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.
