12 | Troubleshooting
36 | 44
Instruction Manual R5 RA 0165-0305 D_EN_en
Problem
Possible Cause
Remedy
The machine does not reach
the usual pressure on the
suction connection.
Oil level too low.
●
Top up oil.
The inlet screen (IS) is partially
clogged.
●
Clean the inlet screen (IS).
The inlet filter cartridge
(optional) is partially clogged.
●
Replace the inlet filter
cartridge.
Internal parts are worn or
damaged.
●
Repair the machine (contact
Busch).
The machine runs very noisily.
Worn coupling (CPL).
●
Replace the coupling (CPL).
Stuck vanes.
●
Repair the machine (contact
Busch).
Defective bearings.
●
Repair the machine (contact
Busch).
The machine runs too hot.
Insufficient cooling.
●
Remove dust and dirt from
the machine.
●
Check the cooling fan.
Ambient temperature too high.
●
Observe the permitted
ambient temperature.
Oil level too low.
●
Top up oil.
The exhaust filters (EF) are
partially clogged.
●
Replace the exhaust filters
(EF).
The machine fumes or expels
oil droplets through the gas
discharge.
The exhaust filters (EF) are
partially clogged.
●
Replace the exhaust filters
(EF).
An exhaust filter (EF) with o-
ring is not fitted properly.
●
Ensure the correct position
of the exhaust filters (EF)
and the o-rings.
The float valve (FV) does not
work properly.
●
Check the float valve and
the oil return line, repair if
necessary (contact Busch).
Abnormal oil consumption.
Oil leaks.
●
Replace seals (contact
Busch).
The float valve (FV) does not
work properly.
●
Check float valve and the oil
return line, repair it if
necessary (contact Busch).
The machine runs at
atmospheric pressure for a
long period.
●
Make sure that the machine
operates under vacuum.
The oil is black.
Oil change intervals are too
long.
●
Flush the machine (contact
Busch).
The inlet filter (optional) is
defective.
●
Replace the inlet filter.
The machine runs too hot.
●
See problem "The machine
runs too hot".
The oil is emulsified.
The machine sucked in liquids
or significant amounts of
vapor.
●
Flush the machine (contact
Busch).
●
Clean the filter of the gas
ballast valve (GB).
●
Modify the operational
mode (see
