Atlas Copco Oil-Injected Rotary Screw Compressor GA37+

Instructions for air-cooled compressors

Stop the compressor, close the air outlet valve and switch off the voltage

Cover all parts under the coolers

Remove the service plates at the fan compartment

Remove any dirt from the coolers with a fibre brush. Brush in the direction of the cooling fins

Also remove any dirt from the fan with a fibre brush

Next, clean with an air jet in the reverse direction to normal flow. Use low pressure air. If necessary, the pressure may be increased up to 6 bar(e) (87 psig)

If it is necessary to wash the coolers with a cleaning agent, consult Atlas Copco

Remove the cover used during cleaning

WARNING! The operator must apply all relevant Safety precautions

Always drain the compressor oil at all drain points. Used oil left in the compressor can contaminate the oil system and can shorten the lifetime of the new oil

Never mix lubricants of different brands or types as they may not be compatible and the oil mix will have inferior properties. A label, indicating the type of oil filled ex-factory, is stuck on the air receiver/oil tank

Run the compressor until warm. Stop the compressor after 3 minutes of unloaded operation. Close the air outlet valve and switch off the voltage. Wait a few minutes and depressurise by unscrewing oil filler plug (FC) just one turn to permit any pressure in the system to escape

Air cooled units: loosen the vent plug (VP) of the oil cooler and wait for 5 minutes

Remove drain plug (DP1) and open drain valve (Dm)

Also drain the oil by removing the drain plug: on the check valve and on the gear casing

Collect the oil in a collector and deliver it to the local collection service. Refit and tighten the drain and vent plugs after draining

Warning: Dispose of the collected condensate according to local regulations for oil containing water

Open the condensate sample valve at the side of the compressor for 5 seconds

Re-open the test valve and collect the condensate in the test bottle

Compare the turbidity of the sample with the 15 ppm turbidity reference bottle

Is the turbidity of the test sample more intense than the reference turbidity?

If the turbidity of the test sample is more intense than the reference turbidity, a request for servicing should be initiated, to be carried out within 2 weeks time.

Sign off on the condensate check

Check air filter service indicator

Check that condensate is discharged during operation

On water-cooled units: check for cooling water flow

Is the outside of the electric motor clean for efficient cooling?

If necessary, remove dust with a brush and/or compressed air jet

The bearing at the non-drive end side is greased for life

The bearing at the drive end side is lubricated by the oil system

Sign off on the bearing maintenance