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Documents & Manuals

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Tensioning Guide
Belt-diagram
C-120 pulleys
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Work Order Templates

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Daily Electrical System Inspection
Replace Roller and Pulley
Install Engine B-120
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Procedures

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Motion Industries
Applied Industrial Technologies
Electrical Brothers
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Parts

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Drive Motor
B2 Rollers
Tensioning System
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Atlas Copco Oil-Injected Rotary Screw Compressor G7

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Maintenance Plans for Atlas Copco Oil-Injected Rotary Screw Compressor Model G7

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Oil-injected Rotary Screw Compressor Safety Valve Testing

Safety Valve Testing Procedure

Stop the compressor

Close the air outlet valve

Switch off the voltage

Open drain valves and the manual drain valve

Unscrew filler plug one turn to permit any pressure in the system to escape

CAUTION! If the valve does not open at the set pressure stamped on the valve, replace the valve

Check if the valve opens at the set pressure

No adjustments are allowed. Never run the compressor without a safety valve

Run this procedure

1000 Hourly Belt Tension Adjustment

Warning: Ensure the compressor is stopped and the voltage is switched off before starting the procedure.

Compressor stopped and air outlet valve closed?

Voltage switched off?

Front door, internal panel, top cover and pulley protection removed?

4 bolts loosened by one turn?

Belt tension adjusted by turning tensioning nut?

Enter the force and deflection values

The values to be measured are indicated with a sticker on the frame.

Bolts retightened?

Run this procedure

8000 Hourly Drive Belt Replacement

WARNING! The belts must be replaced as a set, even if only one of the belts is worn. Only use genuine Atlas Copco belts.

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

Remove the front door, the internal panel, the top cover, the pulley protection and the left side panel

Loosen the 4 bolts by one turn

Release the belt tension by loosening tensioning nut

Remove the fan duct

Remove the belts

Install the new belts

Tension belts as described above

Run this procedure

4000 Hourly PDX/DDX Filter Change

Warning: Ensure the compressor is stopped and the air outlet valve is closed.

Voltage switched off?

Depressurised by unscrewing oil filler plug one turn?

Depressurised the filter by opening its drain valve (for floor-mounted units)?

Depressurised the air receiver by opening condensate drain valve (if compressor is fitted onto an air receiver)?

Filter bowl unscrewed?

Warning: A whistling noise will warn you if the bowl is not fully depressurised. If this occurs, the bowl should be screwed back and the venting should be repeated.

Filter element removed and discarded?

Bowl cleaned and O-ring replaced?

Run this procedure

4000 Hourly Air Filter Replacement

Warning: Ensure the compressor is switched off and the air outlet valve is closed before starting the procedure.

Compressor stopped and air outlet valve closed?

Voltage switched off?

Front panel and top panel of the compressor housing removed?

Filter cover (AF) unscrewed and filter element removed?

Old air filter element discarded?

New element fitted and filter cover screwed on?

Top and front panels refitted?