13
Possible Cause:
Pump was operated for an extended period of time in
the wrong rotation.
Remedy:
Inspect vanes and replace.
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.
4.8 Trouble
Automotive-type oil filter (Ref. 100) does not
get warm within two to five minutes when
cold pump is started.
Possible Cause:
Automotive-type oil filter is clogged.
Remedy:
Replace automotive-type filter per Section 3.2 and
exchange oil per Section 1.5.
Possible Cause:
Wrong automotive-type filter is used and/or oil lines and
oil coolers leading to pump are clogged.
Remedy:
Use only automotive filter as listed in Section 3.2 and
blow lines free. Flush oil cooler.
Possible Cause:
The oil cooler (Ref. 241) is plugged internally with burnt
These values are taken at an ambient temperature of
68°F. The maximum recommended ambient operating
temperature for an R 5 is 100°F on a continuous basis.
When it is necessary to operate a pump in ambient tem-
peratures above this limit, careful oil monitoring and/or
optional water cooling is necessary. Contact the facto-
ry for details.
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 temperature down.
Possible Cause:
Automotive-type oil filter clogged and pump does not
receive enough oil.
Remedy:
Change automotive oil filter.
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 recommen-
dations.
4.7 Trouble
Pump is seized.
Possible Cause:
Pump operated without oil and vanes are broken.
Remedy:
Disassemble and exchange vanes as outlined in the
Maintenance and Repair Manual or contact the nearest
Busch Factory Service Center..
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