Cannot Pull a Shot at the Rated Pressure

We offer 6 and 8 bar springs with the Argos and some early machines got a free gift of a 7 bar spring.

See here for how to identify your springs.

It's common to not be able to pull a shot at the rated pressure of the spring when you first get the machine as it requires a near perfect air bleed of the grouphead to ensure that none of the springs pressure is wasted on compressing air. Additionally you must make sure you have your grind size dialed in so that the puck is able to be fully pre-infused by the boiler again to ensure that no spring pressure is used for pre-infusion.

If both these conditions are satisfied, when you let go of the lever, you'll see no quick pop up of the lever, as there is no air to compress and you'll be utilizing the maximum pressure available to the spring.

That being said all our springs have a tolerance of +- 6%. So for any given 8 bar spring, the actual maximum pressure able to be exerted could be between 8 +- 0.48 bar. For any given 7 bar spring +- 0.42 bar. For any given 6 bar spring 0.36 bar.

Please see these related articles on workflow tips and low pre infusion pressure to get the most out of your Argos.