Discussion Category:  Centrifuge

Rotor removal

I have removed the rotor tie-down screw and can not pull up on the rotor to take it out. Is there a trick to this? All the directions indicate it can be pulled off after the screw is removed. I have looked at both the instruction manual and the rotor manual.

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Asked by

JeffMAI
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23 Replies

avatar placemarkReply by
medphysteo

Amen that!

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avatar placemarkReply by
doodle

I worked at a university fixing "science stuff" and lab results were stressed over lab hygene. Crud gets in the hinges and latches and there it remains. The springs can not overcome the crud and wear out. Solenoid springs too.

Don has way more and way deaper understanding of ALL THINGS BECKMAN and his input is tooooo valuable to have him hang it up.

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avatar placemarkReply by
JeffMAI

Don, I don't think so.  You have been a great help.  Thanks again. Jeff

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avatar placemarkReply by
dpkleessr

Jeff, do what the other contributors recommended and order the springs. The M18's that I worked on never got to the point that your centrifuge has so that's why I never had to replace them. I guess that I am starting to forget too many things about what I worked on for over 30 years that it may be tome to hang it up here.

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avatar placemarkReply by
doodle

So order new springs. As I recall they are "relatively" inexpensive. However you may have to wait from Beckman. Try Ozark. They may have 'em. Take a red or green scotchbrite pad to the hinge pins with soapy water. If the hinge pin sockets are plastic change them too.

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avatar placemarkReply by
JeffMAI

That is eactly the issue.  It clicks (Solenoids engage), but does not clear the houseing. You either have to lift it pretty quickly or yout get the lid error.

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avatar placemarkReply by
doodle

So you depress the 'lid-latch' button and "it" clicks. Is it the latch clicking? Can you manually lift the lid when it clicks?

I have replaced hinge springs on these for that reason.

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avatar placemarkReply by
JeffMAI

Don, the reason I ask is this: It appears that when you hit the lid button to open it all solenoids are working, however the lid does not rise and you get the lid error, have to cycle power or use the manual release to get it open. There was corrosion on the lid hinge, and I cleaned that up, lubricated the hinge shaft, and inspected the springs.  Physically, the lid must be under tension from the springs to rise and disengage when the button is pressed.  However, it will not lift the lid. I would assume that the springs are either installed incorrectly or they are just not holding recommended tension.  They do not appear to be installed incorrectly. Also, when you run a cycle, it does not disengage the the latches automatically, you depress the lid open, and it clicks. Checking the electronics now.

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avatar placemarkReply by
JeffMAI

Don, the reason I ask is this: It appears that when you hit the lid button to open it all solenoids are working, however the lid does not rise and you get the lid error, have to cycle power or use the manual releae to get it open. There was corrosion on the lid hinge, and I cleaned that up, lubricated the hinge shaft, and inspected the springs.  Physically, the lid must be under tension from the springs to rise and disengage when the button is pressed.  However, it will not lift the lid. I would assume that the springs are either installed incorrectly or they are just not holding recommended tension.  They do not appear to be installed incorrectly. Also, when you run a cycle, it does not disengage the the latches automatically, you depress the lid open, and it clicks. Checking the electronics now.

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avatar placemarkReply by
dpkleessr

Sorry Jeff but it has been years since I even set eyes on an M18 so I really didn't remember springs on tge door. Anyway, I never replaced them myself so I can't really comment on actually replacing them but I can't see much use or concern for replacing them as the lid is really not very heavy so no safety issue that I can see.

Don

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