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POWER END AND GEAR REDUCTION
UNIT LUBE SYSTEM (FIGURE 2-1 and
FIGURE 2-2)
Both the internal gear reduction unit and the
power end have one common lube oil inlet.
The power end inlet is located one end of
the lube manifold forward of the gear cover.
The inlet is a 1.25” NPTF tee that divides
the lube flow between the lube manifold for
the main bearing and crosshead guide area
and the rotary unions. Pressurized
lubrication for each crosshead is delivered
from the lube manifold to the top of the
crosshead guides. An aluminum cover
houses the rotary union, which is attached
to the crankshaft. Lubrication for the rotating
power end components comes from forced
lube through the crankshaft. Lube oil enters
the crankshaft and lubricates the connecting
rod bearings. Oil from the crosshead guides
lubes the crossheads and wrist-pin bearings.
As oil reaches the first crankshaft journal, oil
exits the journal oil hole and lubes the
journal and journal bearings. All three
journals are connected through the
crankshaft drilled hole. Oil from the input oil
line feeds through internal hoses to the main
bearings and crosshead slides. This is
repeated for the rest of the main bearing
and crosshead components. Oil is removed
from the power end through a 4” drain
connection in the bottom of the frame. Oil
passages in the crosshead allow the
crosshead cylinders to drain to the power
end sump. Oil is also drained from the gear
covers through drain holes in the outside
frame plates. These drains are all combined
together and empty into the main drains in
the bottom of the pump frame. From here,
it exits to an external oil sump (supplied by
others).
The two main bull-gears are oiled by spray-
bars located inside the gear covers. These
spray-bars are connected externally to the
oiling system through oil hoses. These spray
bars, nozzles, and orifices provide not only
lubrication for the gears and pinions, but
also provide a vehicle to carry away the
generated heat built up by the heavy
loading of the gears and pinions, along with
the pinion bearings and other load carrying
components.
CAUTION:
Gear unit heating problems are most often
related to drain restrictions causing buildup
of oil inside the unit, thus generating
excessive heat. (THIS UNIT IS A DRY-
SUMP DESIGN)
NOTICE
It is also extremely important to
maintain some downward slope in the
entire drain system back to the lube
reservoir
.
FIGURE 2-2: C-2500Q Gear Reduction Components
Summary of Contents for C2500Q QUINTUPLEX
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