6
For overhaul/repair of oxygen service pumps,
Busch Inc. strongly recommends that all major repair
operations be conducted at the factory. Improper
handling of repairs could result in extreme
danger to personnel operating the pump.
3.0 ROUTINE MAINTENANCE
R 5 Series pumps require very little maintenance; how-
ever, to insure optimum pump performance, the follow-
ing steps are recommended.
3.1 Pump Oil
3.1.1 Oil Level
With the pump installed relatively level, make sure that
there is sufficient clean oil in the pump. The oil level
should be observed on a daily basis and/or after 8
hours of operation and should be replenished if it drops
below the 1/4 mark on the oil sight glass on pumps with
one sight glass.
On RA Series pumps, you must first shut the pump off
in order to let the oil flow back into the oil sump prior to
checking the sight glass. Allowing insufficient time for
the oil to drain back into the sump on RA Series pumps
prior to adding oil could result in overfilling.
Oil level readings should be done only when the pump
is turned off. Oil can be added to the oil fill port (Ref.
88) if the pump is shut off and the circulating oil has suf-
ficient time to return to the oil sump. The oil might
appear to be foamy, which is a normal phenomenon
with aerated oil.
Under normal circumstances, it should not be neces-
sary to add or drain oil from the pump between recom-
mended oil changes.
A significant drop in oil level means there is an oil leak
or that an exhaust filter is broken, and the pump should
be smoking excessively. It is normal for the oil to be
foamy and light in color in an operating pump.
However, if the oil is milky colored, it is an indication
that water is present in the oil. Normally, by operating
the pump for an extended period, with the inlet suction
blanked off and the gas ballast (Ref. 440) open on RA
pumps, the water will be purged from the oil. If the oil
is dark colored, it is contaminated or carbonized and
must be changed. Depending on the severity of the
contamination, a thorough flushing may be needed.
Contact the factory for flushing oil (Busch R568) and
refer to Section 3.1.4 for the flushing procedure.
3.1.2 Oil Type and Quantity
See Section 1.5 - Oil Filling for details on oil type and
quantity.
3.1.3 Oil and Filter Change
See Section 1.5 and the Technical Data on page 14 for
details on oil type and quantity.
Check the oil for contamination on a weekly basis by
shutting the pump off and draining some of the oil into
a small glass or a similar transparent container through
the oil drain port (Ref. 95).
Oil life is dependent upon the conditions to which it is
exposed. A clean, dry air stream and an oil operating
temperature under 210°F are ideal conditions. When
using R530 (hydrocarbon oil), it is recommended that
oil changes are made every three (3) to four (4) months
or 500 to 750 hours of operation, or as necessary if high
heat is contaminating the oil. The use of Busch R570
(synthetic) or R590 (semi-synthetic) oil may significant-
ly extend the operating hours between oil changes
under ideal conditions. However, you may need to flush
out the pump before changing. Contact the factory
Service Department for advice. Oil samples should be
taken regularly when exceeding the 500-750 hour rec-
ommendation.
Excessive Heat
When the pump is subjected to operating conditions
that will cause the oil to be heated above 210°F, the oil
will carbonize and become contaminated after a rela-
tively low number of operating hours. The higher the
temperature, the quicker the oil becomes contaminated.
CAUTION: Do not add oil while the pump is
running since hot oil vapor may escape
through the oil fill port.
CAUTION: When changing the oil and fil-
ters, it may be necessary to flush the pump
to remove any build-up of degraded oil from
the sumps, oil lines, radiators, etc., to
ensure proper oil flow through the pump.
Reduced oil flow, especially through radia-
tors and cooling coils, can cause mechani-
cal damage or extreme overheating, which
could cause the oil vapors to ignite.
CAUTION: Insufficient oil quantity in the
pump has the potential, under certain con-
ditions, to lead to self-ignition of the
remaining oil in the pump.
WARNING: Always take the necessary pre-
cautions concerning personal protective
equipment when changing oil and make
sure the pump is switched to "off" so that
accidental starting will not occur. Oil tem-
perature can reach 212°F and may pose a
danger of scalding.
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