User manual

Industrial Air Division
192920 1163 04
3 Maintenance
Attention
Before starting any maintenance, press stop button O (9-Fig. 7a),
wait until the compressor has stopped (approx. 30 seconds), press
stop button (S3-Fig. 7a) and switch off the voltage. Apply all
relevant safety precautions, including those mentioned in this book.
A yellow-painted blocking device is delivered loose. The device can
be fitted around the closed outlet valve (AV-Fig. 8) to lock the valve
during maintenance or repair works.
3.1 Compressor motor (M1-Figs. 2)
The bearings must be regreased with a lithium-soap-based grease
according to DIN 51 825 K3k. Quantity: 10 g (0.35 oz) per bearing
each 2000 operating hours if working in ambient temperatures
above 25°C, 20 g (0.7 oz) each 4000 hours if working below 25°C.
The lubrication points are marked.
3.2 Preventive maintenance schedule for the
compressor (see next page)
The schedule comprises a summary of the maintenance
instructions. Read the respective section before taking
maintenance measures.
When servicing, replace all disengaged packings, e.g. gaskets,
O-rings, washers.
The "longer interval" checks must also include the "shorter
interval" checks.
3.3 Oil and oil filter change interval
Consult section 3.2 for the change intervals and section 3.4 for the
oil specifications.
The oil change interval depends on the working temperature.
See note 5 below the maintenance schedule.
3.4 Oil specifications
Never mix oils of different brands or types. Consult Atlas Copco for
the recommended oils. Use only non-toxic oils where there is a
risk of inhaling delivered air.
3.4.1 Atlas Copco Roto-injectfluid
It is strongly recommended to use Atlas Copco Roto-injectfluid.
This is special oil for screw compressors which keeps the
compressor in excellent condition. If Atlas Copco Roto-injectfluid is
not available, oil as specified in section 3.4.2 can be used.
3.4.2 Mineral oil for hydraulics
High-quality, mineral oil for hydraulics with oxidation inhibitors and
anti-foam and anti-wear properties. The viscosity grade must
correspond to the ambient temperature and ISO 3448, as follows:
Ambient temperature Viscosity Viscosity
grade index
Consistently above 25°C (77°F) ISO VG 68 Minimum 95
Between 25°C (77°F) and
0°C (32°F) ISO VG 32 or 46 Minimum 95
3.4.3 Synthetic hydrocarbon lubricant
A polyalphaolefine-based synthetic hydrocarbon lubricant with anti-
oxidation, anti-foam and anti-wear properties can also be used.
The viscosity grade must be ISO VG 32 or ISO VG 46 and the
viscosity index minimum 130. Consult Atlas Copco.
1. Oil separator kit
2. Moisture trap kit
3. Filter kit
4. Filter kit
5. Minimum pressure valve
kit
6. Check valve kit
7. Oil stop valve kit
8. Thermostat kit
9. Unloader kit
10. Thermostat kit
11. Oil kit (Atlas Copco Roto-
injectfluid)
Fig. 11. Preventive maintenance kits (typical examples)
1 2 3/4 11
F023
9 8/10 7 6 5