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FIGURE 2-3 GD 3000 Power End Top View
NOTICE
The direction of rotation must be
such that the top side of the
crankshaft is moving towrd the fluid
end.
The cast crosshead guide connects the
pump power frame and the fluid cylinder
and the whole assembly is held together by
eight (8) tie rods with sleeves. This
approach is weight efficient and allows for
convenient service and disassembly after
the fluid end is removed. The connecting
rods and the crossheads are easily
accessible through the front of the guide.
The long tie rods tend to elongate under
load
substantially,
thus
reducing
the
stresses under dynamic rod load. If the fluid
cylinder
nut
tightening
procedure
is
performed properly, the tie rods will last
indefinitely.
The connecting rod is 27.25” long (center to
center) providing a smaller pressure angle,
increasing component life significantly. The
knuckle joint design is essentially standard
but utilizes a large knuckle (7”) and
crosshead (13.5”), thus allowing extremely
high rod load (350,000 lbf.). (See FIGURE
2-3).
Also, the pump has a drain pan to collect
the oil and other liquids from the
reciprocating plungers and pony rods. A
cover, hinged to the crosshead guide,
encloses the reciprocating parts to provide
for personnel safety.
GEAR REDUCTION UNIT (FIGURE 2-4)
A light weight, highly efficient pump gear
box consists of a planetary drive with an
offset parallel gear drive bolted to the
planetary. The overall ratio of the reduction
gear unit is 7.842:1. This arrangement
offers the best power to weight ratio and
flexibility in using different prime movers
such as diesel engines as well as electric
motors. The installation and removal of the
gear reduction unit is easy and convenient
due to a splined gear coupling between the
planetary carrier and the pump crankshaft.
All gears are carburized, case hardened,
heat treated and precision made of aircraft
quality steel to ensure the highest reliability
and
long
life
of
the
gear
box.
