4.5.2 Possible Cause
Bearing noise.
Remedy:
Follow disassembly and assembly steps outlined in the
Maintenance and Repair Manual and replace bearings.
4.5.3 Possible Cause
Vanes stuck.
Remedy:
Follow disassembly/assembly instructions outlined in the
Maintenance and Repair Manual and replace vanes.
Use only recommended Busch oil and change oil more
frequently.
4.6 Trouble
The pump runs very hot. See Technical Data for typical
oil sump temperature.
Note:
The oil temperature with a closed inlet should be
approximately 185
-225°
F
depending on pump type
. At
24 in. Hg, the oil in the pump can go above 225°F. These
values are taken at an ambient temperature of 68°F. The
maximum recommended ambient operating temperature
for an R5 is 100°F on a continuous basis. When it is
necessary to operate a pump in ambient temperatures
above this limit, careful oil monitoring and/or optional
water cooling is necessary. Contact the factory at
Virginia Beach for details.
4.6.1 Possible Cause
Not enough air ventilation to the pump.
Remedy:
Clean motor and pump air grills. Do not install the pump
in an enclosed cabinet unless a sufficient amount of cool
air is supplied to the pump. On pumps with oil cooling
coils, clean outside fin assembly. Bring ambient air tem-
perature down.
4.6.2 Possible Cause
Automotive-type oil filter clogged and pump does not
receive enough oil (not applicable on 0010, 0012, 0016
or 0021).
Remedy:
Change automotive oil filter.
4.6.3 Possible Cause
Not enough oil in oil reservoir or badly burned oil is used
for pump lubrication.
Remedy:
Drain and refill only with Busch recommended oil.
Increase oil change intervals.
Note:
On some high temperature applications, it may be
necessary to change to a high temperature oil such as
R590 or R570. Contact the factory for recommenda-
tions.
4.7 Trouble
Pump is seized.
4.7.1 Possible Cause
Pump operated without oil and vanes broke.
Remedy:
Disassemble and exchange vanes as outlined in the
Maintenance and Repair Manual.
4.7.2 Possible Cause
Pump was operated for an extended period of time in the
wrong rotation.
Remedy:
Inspect vanes and replace.
4.7.3 Possible Cause
Liquid carryover into the pump cylinder broke vanes
while pump was running, or oil broke vanes on start-up.
Remedy:
(a) Install condensate trap on the inlet of the pump.
(b) Pump was overfilled with oil in oil reservoir. Follow oil
filling procedure (see Section 1.5) and do not overfill.
(c) Built-in, anti-suck-back valve (Ref. 250 through 255)
leaking while pump was shut down and vacuum was left
in manifold. Clean valve seat and check that anti-suck-
back valve holds vacuum on inlet when pump is shut
down.
(d) Two pumps or a receiver is on the same main line.
Install a manual or automatic operated valve in front of
each pump.
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