94
Note
Dispose of fine separator in accordance
with the relevant regulations - hazardous
waste!
Check for leaks.
Replace the fine separator at least once
per year or measure the differential
pressure as follows:
* When the engine is at a standstill and
the screw compressor is not under
pressure, unscrew the dipstick from the
pressure tank.
* Screw in the reducing adapter.
* Screw the pressure gauge into the
reducing adapter.
* Start the screw compressor.
* The difference in pressure between the
pressure gauge on the pressure tank
and the pressure gauge on the
instrument panel must not exceed 1 bar.
If the differential pressure is > 1 bar, the
fine separator cartridge must be replaced.
* Remove all hexagon screws around the
circumference of the lid.
* Remove the lid and the old fine
separator.
* Remove the old seals from the pressure
vessel, clean the sealing surface and fit
a new seal (part no. 931 820 00).
* Insert a new fine separator (part no.
131 382 74) into the pressure vessel
and fit a new seal (part no. 931 820 00).
* Fit the lid. Insert the hexagon screws
and tighten them across the diagonal
(tightening torque see Chapter 9.4.9
"Torque specifications").
* Check for leakage.
* Dispose of the old fine separator
cartridge in the specified manner.
9.4.5 Air filter replacement
(compressor / engine)
Danger
All inspections and servicing work must
be carried out when the engine is at a
standstill and the screw compressor is
not under pressure.
Fig. 29
Note
Check the air filter every week for dust.
Every air filter is supplied with a
maintenance indicator, which indicates
the adding of the filter cartridge. The
maintenance intervals of the air filter
depend on the air pollution.
If the red field of the maintenance indicator
is visible and stays engaged when the
screw compressor is turned off, you must
exchange the air filter cartridge (at least
every 12 months).
Replace the air filters of the screw
compressor and of the engine once yearly.
Do not clean or reuse the air filter.
Attention
Replace the safety cartridge (optional)
at the latest every third time the air filter
element is replaced.
Replace air filter.
* Loosen the tensioning brackets at the air
filter and fold away.
* Remove filter hood.
* Remove filter cartridge from the filter
hood.
* Remove safety cartridge (optional)
from the housing.
* Replace filter cartridge.
Danger
Never clean the air filter cartridge with
inflammable liquids.
9. Maintenance
Reassembling the air filter:
* Clean the sealing surface in the filter
housing.
* Insert safety cartridge (optional) and
ensure correct seating.
* Insert the filter cartridge and make sure
that the seal is properly seated.
* Replace filter hood and fasten using the
tensioning brackets (the tensioning
brackets can only be closed if the filter
cartridge with seal is seated properly on
the sealing surface of the filter housing).
* Reset the maintenance indicator by
pressing the reset lever.
9.4.6 Checking the safety valve
Fig. 30
Check the operation of the safety valve at
least twice a year. The check is carried out
with the system pressurised. Carefully turn
the knob anti-clockwise, until the internal
pressure lifts the valve cone, releasing a
mixture of oil and air. Then turn the knob
fully clockwise again.
In accordance with national standards,
but at least once a year, carry out a
suitable test to check whether the valve
blows down at the correct pressure.
If the valve is not working properly,
replace it immediately with a new one
designed for the system. This type of
operation may only be carried out by
trained personnel.
Danger
The screw compressor must not be
operated with a faulty safety valve!
A mixture of oil and air will escape when
the valve is checked/tested.
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