Activities Level A Level B Level C
Inspect and operate the dryer bypass valves (open/close
position)
X X X
9.2 Motor greasing
General
Stop the compressor and follow the LOTO procedure (Lock Out - Tag Out) (refer to
General Safety Precautions) before greasing.
Never mix greases of different brands or types.
Main motor bearings
Refer to the motor re-greasing data plate for the recommended grease type, the greasing quantity and
interval for the motor bearings.
Fan motor bearings of ZT compressors
The bearings of the fan motor are greased for life.
9.3 Oil specifications
Roto-Z lubricating oil
Use Atlas Copco Roto-Z oil which is specially developed for oil-free rotary compressors. This oil has a
long service life and ensures optimum lubrication.
Atlas Copco Roto-Z oil can be ordered in following quantities:
Quantity (l) Quantity (US gal) Quantity (Imp gal) Quantity (cu.ft) Ordering number
5 l can 1.32 US gal can 1.10 Imp gal can 0.18 cu.ft can 2908 8503 00
20 l can 5.28 US gal can 4.40 Imp gal can 0.70 cu.ft can 2908 8501 01
209 l drum 55.18 US gal drum 45.98 Imp gal drum 7.32 cu.ft drum 2908 8500 00
9.4 Storage after installation
Run the compressor, e.g. twice a week, until warm.
If the compressor is going to be stored without running from time to time, protective measures must be
taken. Consult Atlas Copco.
Instruction book
2920 1815 04 285
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