Haas 121 alarm: Low lubrication or low pressure

Haas detects insufficient level/pressure in the lubrication system or associated pressure. It is an alarm from the Lubrication area, and in the catalog it is listed as “Low lubrication or low pressure”. On the machine you notice it like this: Low lubrication warning, The cycle may lock up, Risk for guides and spindles.

On the shop floor it almost always comes from one of these causes: Low deposit, Bomba de engrase, Clogged line, Pressure sensor. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset after confirming correct lubrication cycle. Resetting without fixing the cause first only hides the problem: Haas 121 trips again and, in the meantime, you keep working with the machine in bad shape.

With the machine stopped and in a safe state, start with these checks: Check the level and that the oil is correct, Look for leaks, Run a manual lubrication cycle if the manual allows it. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Haas 121 active, avoid this: Do not bypass safety devices, Do not manipulate energized electrical cabinet, Do not continue producing if the alarm reappears. Skipping any of these points is what turns a minor stop into an expensive breakdown.

If the pressure does not rise or the alarm repeats. If you are not sure how far it goes, stop the machine and report it: a repeat alarm always works out cheaper than a crash.

It is critical: there is a real risk of damage to the machine, the tool or a person. Leave the machine stopped, do not keep resetting it to see if it goes away, and call maintenance before producing again. Guidance reference. Always confirm the full text in the exact machine/control manual.