Gardner Denver C2500Q QUINTUPLEX, Operating And Service Manual

Page: 16 / 46

10
Section 4, "Service Procedures," describes
the
various assembly / disassembly
procedures.
Section 5, “Trouble–Shooting,” describes
possible problems, causes and solutions
related to pump performance.
Section 6, “Rebuilding Data, Recommended
Running Clearances and Torques,” presents
information useful for pump rebuilding and
assembly,
including dimensional and
tolerance data, running clearances for all
bearings,
and recommended fastener
torques.
PUMP DESIGN
The C2500 quintuplex pump uses only two
major assemblies: power end and fluid end.
The gear reducer is located inside the power
end. The pump is designed with a modular
concept. Each assembly is a module that
can be assembled, handled, installed, fixed,
or transported separately from the rest of
the pump (See FIGURE 2-1, page 9). The
following is a brief description of the
essential design features for each modular
assembly.
POWER END (SEE FIGURE 2-1)
The power end design is a fabricated steel
frame made from high-strength low-alloy
steel plate, joined by heavily welded cross-
members to provide stiffness and strength.
This design concept provides maximum
durability with minimum weight.
NOTICE
The direction of rotation must be
such that the top side of the
crankshaft is moving toward the fluid
end.
The crossheads and crosshead-guides are
full-cylindrical design for minimum PV
loading
and maximum lubricity. The
connecting rods bolt to the conn-rod bearing
housings. The conn-rod bearing housings
are accessible through the rear of the pump,
and the connecting rod / crosshead
assemblies through the nose or front of the
pump. The crankshaft is a forged steel
automotive type crankshaft with four
cylindrical
roller-bearing mains. The
connecting rod bearings are automotive
journal-type bearings, and the wrist-pin
bearings
are hi-alloy bronze journal
bearings.
The crankshaft and crossheads are on the
same center-line. The fluid end is held in
place and in alignment with the power end
by the twenty- (20) stay-rods. (See
FIGURE 2-2).
The power end is fully enclosed to contain
the power end oil, collecting the oil and
draining out the bottom skin through a 4”
NPTF weld-o-let connection. This is a dry-
sump pump. An external oil sump and lube
pressure and filter system is required.
GEAR REDUCTION UNIT (FIGURE 2-2)
The internal gear reduction consists of two
helical bull-gears located on both end of the
crankshaft and one input pinion shaft with
helical pinion gears on each end. The
overall ratio of the reduction gear unit is
6.353:1 This arrangement offers a good
power to weight ratio and flexibility in using
different prime movers such as diesel
engines as well as electric motors. All
gears
are heat-treated, carburized,
hardened and ground to AGMA quality level
8 or better to ensure the reliability and long
life of the gear box. The gear covers
protect the gears, plus collect the oil and
drain it back into the power end for
collection
in the sump.