Version with oil return valve (f, 280):
In case the vacuum pump runs for more than
10 hours without interruption, oil can collect
in the upper chamber of the oil separator (o,
75) to an extent that it gets expelled together
with the discharged gas
Regularly shut down the vacuum pump for
short periods of time. Check that the oil return
valve (f, 280) functions properly and lets oil
run from the upper into the bottom chamber
of the oil separator (o, 75) as soon as the
vacuum pump is shut down (Ú Product De
-
scription à Oil Recirculation)
Version with oil return valve (f, 280):
The oil return valve (f, 280) does not work
properly or is clogged (proper function is
when blowing into the valve it should close,
when vacuum is applied, the valve should
open; CAUTION: do not let your mouth get in
direct contact with the oil return valve, do not
inhale through the oil return valve!)
Clean or replace the oil return valve (f, 280)
Version with float valve (j, 200) and oil return
line
The float valve (j, 200) is stuck in closed posi
-
tion
Make the float valve (j, 200) movable, replace
if necessary (Ú Maintanance à Oil and Oil
Filter Change à Checking the Float Valve)
The oil return line (j, 195) is clogged or broken Clean a clogged oil return line (j, 195)
Replace a broken oil return line (j, 195) with
an identically dimensioned line, top up oil (if
necessary by Busch service)
The oil is black Oil change intervals are too long
The oil was overheated
Flush the vacuum pump
Replace the oil filter (h, 100)
Replace the exhaust filter (p, 122)
Fill in new oil
(Ú Maintenance)
In case the oil life is too short: use oil with
better heat resistance (Ú Oil) or retrofit cool-
ing
The oil is watery and coloured white The vacuum pump aspirated water or signifi-
cant amounts of humidity
Flush the vacuum pump
Replace the oil filter (h, 100)
Replace the exhaust filter (p, 122)
Fill in new oil
(Ú Maintenance)
Modify the operational mode
(Ú Installation and Commissioning à Oper
-
ating Notes à Conveying Condensable
Vapours)
The oil is resinous and/or sticky Improper oil type, perhaps in confusion
Topping up of incompatible oil
Flush the vacuum pump
Replace the oil filter (h, 100)
Replace the exhaust filter (p, 122)
Fill in new oil
(Ú Maintenance)
Make sure the proper oil is used for changing
and topping up
The oil foams Mixing of incompatible oils Flush the vacuum pump
Replace the oil filter (h, 100)
Replace the exhaust filter (p, 122)
Fill in new oil
(Ú Maintenance)
Make sure the proper oil is used for topping
up
Troubleshooting RA 0025 - 0040 F
page 18 0870139077 / 051214
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