Series pumps is shown in the TECHNICAL DATA page
25.
If the gas that is pumped contains dust or other foreign
solid particles, a suitable inlet filter (10 micron rating or
less) should be connected to the inlet port. Consult the
factory for recommendations.
1.5 Oil Filling
The pump is shipped without oil. After level installation,
and after correct rotation has been established, fill the
pump with the recommended vacuum oil through the oil
filling port (Ref. 88), observing the "MAX" and "MIN" posi-
tion at the oil sight glass (Ref. 83). On pumps with two
sight glasses, fill the top glass up to the 3/4 mark.
Non-detergent oil should be used.
Do not use deter-
gent motor oil
as additives in detergent oil will plug
exhaust filter elements and shorten their life.
It is recommended that Busch R500 Series oil be used to
receive the best performance from your vacuum equip-
ment. R500 Series oil is a high quality vacuum oil that
will give longer running time between oil changes, will
provide better lubrication at high operating temperatures,
and will prolong the life of exhaust filter elements. This
oil can be obtained directly from Busch, Inc. in Virginia
Beach, Virginia.
The strict use of Busch oils and parts from the day of pur-
chase can extend the standard warranty to three years.
Contact Busch, Inc. in Virginia Beach, Virginia for details.
Refer to page 12 for the standard warranty.
For general applications, use R530 in all models covered
by this manual, except for the 0021 model, which should
use R580. Use R590 or R570 in pumps that are operat-
ed in high ambient temperatures (above 90°F) or high
operating pressure when the oil carbonizes (turns black)
before the change interval. Contact the factory for rec-
ommendations when using other oils.
The TECHANICAL DATA chart on page 25 gives the
approximate quantities of oil required for each pump.
The oil capacity chart should only be used as a guide,
since oil capacity may be slightly lower, depending on
whether the pump was filled previously, and whether all
components such as oil filter, oil lines, etc., were allowed
to completely drain. Use only the sight glass reading for
proper level. Never overfill!
For ambient operating temperatures lower than 41°F,
use Busch R580 synthetic oil. If this does not help
(where the pump has difficulty starting due to high oil vis-
cosity), contact the factory in Virginia Beach, Virginia.
Replace the oil fill plug (Ref. 88), making sure that the
gasket (Ref. 89) is in place and properly seated and
secured. Some pumps are equipped with an exhaust
pressure gauge as an integral part of the oil fill plug.
2.0 OPERATION
2.1 Start-up
Check rotation of the motor as described in Section 1.3 -
Power Requirements.
Fill the pump with oil as described in Section 1.5 - Oil
Filling.
Start the pump and immediately close the inlet. Run the
pump for a few minutes before checking the oil level
again. With the pump shut off, the oil level should be vis-
ible in the oil sight glass (Ref. 83), between the "MIN"
and "MAX" mark.
On pumps with two sight glasses, with the pump shut off,
the oil level should be visible in the upper oil sight glass,
between the "MIN" and "MAX" mark.
Add oil, if necessary, but only add it when the pump has
been shut off and the circulating oil has had sufficient
time to return to the oil sump.
Note:
The oil separated by the exhaust filter element
forms droplets on the outside of the exhaust filter that
collect at a low point in the upper half of the exhaust box.
From there the collected oil is drained back to the oil
sump via an oil return valve (Ref. 275), which opens on
R5 RA/RB model pumps when the pump is shut off. It is
necessary to shut off the pump (all RA model pumps and
RB0021 model pumps) after every 8 hours of operation
to allow the check valve to open. If the pump is not shut
off after this time period, it is possible to starve the pump
of oil since the oil is not allowed to drain back into the oil
sump and/or oil droplets may be blown out of the
exhaust. If the pump is operating at high pressure, it may
be necessary to shut it down sooner than 8 hours.
On R5 (Standard) RC model pumps, the collected oil is
drawn continuously during operation of the vacuum
pump to the inlet flange (Ref. 260) via the oil return line
(Ref. 290). The oil return line is connected directly to the
area of the exhaust box, downstream of the exhaust fil-
ter, which is at atmospheric pressure. Therefore, a con-
stant amount of air is sucked into the pump, which is an
additional reason that the R5 Standard Series Pumps do
not achieve as low a vacuum as the R5 Series Super
Vacuum Pumps. RC model pumps can run continuous-
ly without having to shut them off for the oil to drain back.
WARNING: Do not use hydrocarbon oils in pumps
on oxygen service. See Section 2.6 - Oxygen
Service Pumps.
WARNING: Keep the oil fill plug tight as pressure in
the exhaust box could cause bodily injury if the plug
is blown out. Do not fill/add the pump with oil
through the exhaust/inlet ports as there is danger of
breaking the vanes!
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