Checking the belt tension
Step Action
1 Stop the compressor, close the air outlet valve and switch off the voltage
2 Remove the front panel and the right panel.
3 The tension is correct when the force F needed to create a deflection of 5 mm (0.2 in) corresponds
to the data in the table below.
4 Refit the bodywork panels.
Model New belt Used belt
F Frequency F Frequency
N lbf Hz N lbf Hz
GA 5 18.2 5.1 105 12.6 3.6 86
GA 7 18.2 5.1 105 12.6 3.6 86
GA 11 21.2 6.1 115 14.2 4.0 94
Adjusting the belt tension
Step Action
1 Stop the compressor, close the air outlet valve and switch off the voltage.
2 Remove the front panel and the right panel.
3 Loosen bolts (2) by one turn.
4 Adjust the belt tension by turning nuts (1).
5 The tension is correct when the force F needed to create a deflection of 5 mm (0.2 in) corresponds
to the data in the table above.
6 Tighten bolts (2).
7 Refit the bodywork panels.
Replacing the belts
The belts must always be replaced as a set, even if only one of the belts is worn. Only use
genuine Atlas Copco belts.
Step Action
1 Stop the compressor, close the air outlet valve and switch off the voltage.
2 Remove the front panel and the right panel.
3 Loosen bolts (2) by one turn.
4 Release the belt tension by loosening nuts (1).
5 Remove the belts.
6 Install the new belts.
7 Tension the belts as described above.
Instruction book
152 2920 7090 51
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