Are the H and K's blood pump rotors interchangeable? I like the older version because it has a turning handle built in. Thanks for your replies.

I do not believe that they are, at least not the newer ones. Those rotors were the force behind the Semi Annual v Quarterly pm.

Tech manager is correct. Even though the parts manual says the part # for the k's blood pump rotor is M30990, you need to order the M35310 if you want to comply with fresenius's 6 month PM. I don't see much difference between the two rotors except for the built in handle. So I'm not sure why one complies and the other doesn't.

breakpar now, I have a question. Instead of order "K" M30990 for the K, why you said we need to order M35310. In my record, M35310 is for the H.

Tommy - Ooops - I mixed up those part #s M30990 is for the K and M35310 is for the H. I must have an old parts manual. The 6 month PM qualification checklist requires the M30990. No idea why. Like I said except for the handle they look pretty similar.

There was an early version of the blood pump rotor for the K machines that had a different fastening for the guide pins. I think it was threaded screws, not rivets. That rotor does not meet the requirements for the Six Month PM. We found some of those rotors in late 2003 and early 2004 machines. Also note that very early (Pre +-2003?) K machine blood pump modules may not meet the requirements do to the engineering code on the blood pump module and the version of the LP 955 board being wrong. So if you are buying rebuilt boards or modules you will have to be careful and be sure that they meet the requirements. And of course, no H blood pump rotor or complete module would meet that requirement either. And as long as we are on the subject of the 6 Month PM program, is anyone changing out the capacitor in the power supply if it is older than 5 years? How are you discharging that cap before you remove it from the power supply? I know that a big resistor will do it, but it will probably get pretty hot and might even burn you if you touch it after the cap discharges. I am thinking that a light bulb that would be connected to the ground post in the power supply and to the cap would be safer, but I haven't come up with one yet.

Does Fresenius recommend changing the capacitor after 5 years?

See page 59 in the "Fresenius 2008K Semi-Annual Preventive Maintenance Procedures Guide, Rev.A", "Step 3, Replace the 10 micro-ferrad capacitor(PN 361216-03) if it shows any signs of damage OR if the power supply is more than 5 years old." There is no procedure given for doing that replacement. Here is what I think is the reason that Fresenius is doing this. Recently all electrolytic caps have date codes on them, like 05 32 meaning that it was made in 2005, the 32nd week. There was a huge scandal more than five years ago that involved industrial theft of the formula for the electrolytic solution. A key ingredient was left out of much of the suspect solution and there has been a very big problem with failing capacitors in many electronic items. As a result many manufacturers of all kinds of equipment are reccomending replacement of electrolytic caps at five years. I looked at an H machine power supply the other day from 1993 and the cap in it did not have a date code on the label of the cap. If I were to use that power supply in a K 6 Month PM machine, or if that power supply was rebuilt, than the cap would have to be replaced, since it is older than 5 years, even though the electrolyte in it was not the defective solution.

This message has been edited. Last edited by: Ktech,

Thanks for the info KTECH, YOU ARE A PRETTY SMART TECH, I LIKE THE SOLUTIONS THAT YOU GIVE ON THIS FORUM.