Atlas Copco Industrial Cast Iron Piston Compressor CR7.5

Manually operate the pressure relief valves

Clean cooling surfaces of the intercooler, aftercooler, and compressor

Check for air leaks in the compressor and air distribution system

Sign off on the compressor maintenance

Warning: Ensure the compressor is stopped before starting the procedure

Cap on top of the cover unscrewed

Cover and filter element lifted off

No dirt dropped inside the suction silencer

Filter chamber and cover cleaned with a damp cloth

Warning: This procedure should be performed by trained personnel only!

Is the pilot valve equipped with a hand-operated unload mechanism?

Turn the red handle 90 degrees to lift the plunger of the valve, releasing the spring force.

Did the air pressure from the pulsation dampers force down unloader plunger and the compressor run unloaded?

Turn handle 90 degrees further, the plunger returns to its original position so that the pilot valve will again unload and load the compressor at the pre-set pressures.

Did the plunger return to its original position?

Loosen handle and the two nuts.

Turn the adjusting screw clockwise to increase the maximum pressure.

Did the maximum pressure increase?

Warning: Always ensure the compressor is turned off and fully depressurized before starting any maintenance tasks.

Check lubricant levels several minutes after stopping

Drain and replace contaminated lubricant

Drain moisture from the receiver tank, drop legs, and air traps

Visually inspect the compressor and safety guards

Check for unusual noise or vibration

Check pressurized components for rust, cracks, or leaks

Sign off on the maintenance tasks

Note: Use a shorter interval in harsh conditions.

Pulley clamp screws or jamnut torqued?

Lubricant completely drained from the crankcase and replaced after initial 100 Hours of operation?

Check the belt tension every 160 Hourly / 1 Monthly.

Sign off on the maintenance procedure