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Problem Why is my CHNC I Vertical Slide Hydraulic Pump ALWAYS ON?

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There is something wrong with my vertical slide - when my machine turns on, the hydraulic pump to the vertical slide turns on and never turns off. It continues to draw air until my industrial compressor runs out of air. The only way I've been able to use the lathe is by disconnecting the hydraulic pump.

I figured it was normal and that my 10.5SCFM compressor couldn't keep up, but then I read in the manual the pump should only engage when the slide is being commanded to move. Otherwise, the pump should turn off again.

As further evidence, I was running a job recently when suddenly I got a "Vertical Slide in Motion" error, yet re-engaging the motor did not cause any movement (but the error eventually went away.)

Can anyone discern why the pump is constantly active? I suppose it could be a limit switch that isn't tripping... I imagine the hydraulic pump lacks the finesse of fine movement, so two course switches ought to govern it's feed and retraction. The trouble is, I can only test the motion for about 20 seconds before the pump runs out of air, and neither an M23 nor M25 seem to move the slide in either direction. I wonder if I'm even looking at the problem in the right way.

Is anyone familiar with the installation of a vertical slide on a CHNC machine? And/or, would anyone happen to have a PDF of the vertical slide installation instructions??


Torin...

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