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Post by G$ on Aug 17, 2022 13:23:14 GMT
Anyone have a text book answer on how often to change flow motor brush's? Many years ago I heard every 20, 000 on the old H machines. Your thoughts?
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eric
Full Member
Posts: 114
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Post by eric on Aug 17, 2022 14:26:35 GMT
Usually i do it on the annual just to make sure there is never a failure. I know thats overkill but its a small price to pay for peace of mind.
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pacnw
Full Member
Posts: 187
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Post by pacnw on Aug 17, 2022 16:49:54 GMT
Our area does the deaer and flow at the same time. 8000 hours is the required timing for the change. The new deaer and flow motors coming out now have the brass sleeve holding the brush so maybe that will change. I doubt it but it does allow more travel to the brush. Like Eric said it's best to change them regularly to eliminate future problems.
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Post by Sheepdog1 on Aug 17, 2022 18:17:18 GMT
i like every other annual cycle. the more times you open and reset the brushes, the more potential for damage... just my philosophy
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Post by gnurk on Aug 18, 2022 12:13:00 GMT
i have rebuilt more motors than any 3 techs i do the flow at 15 k blood pump at 15k deairation at 8k cant tell you how many times i have had a motor stall because jof a cold solder joint or a snagged brush wire do to excessive rebuilding, just bear in mind every time you open one up you run the risk of screwing it up yourself
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Post by vantech on Aug 20, 2022 9:10:26 GMT
I would agree with gnurk. This happens for me around every 4 years.
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Post by Jeezum Peets on Aug 20, 2022 11:41:41 GMT
You asked for the textbook answer, then everyone gave you their personal opinion! LOL
Well, the textbook answer is rebuild upon failure.
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Post by bcjammerx on Aug 21, 2022 22:22:13 GMT
i have rebuilt more motors than any 3 techs i do the flow at 15 k blood pump at 15k deairation at 8k cant tell you how many times i have had a motor stall because jof a cold solder joint or a snagged brush wire do to excessive rebuilding, just bear in mind every time you open one up you run the risk of screwing it up yourself how did you rebuild blood pump motors...I tried once, got the snap rings off but couldn't get beyond that point without destroying the motor. did you have a special press or puller? I couldn't get mine to budge without destroying the motor, I used prybars so not the right tool for sure but still. I replaced the brushes on flow pumps about every year to year and a half. I can't give hours of use, never paid attention to that. this was at clinics running 3 shifts 6 days a week. That was only if I used hard brushes. I was told to never put hard brushes in deair motors and those got replaced every 6-10 months...not sure why you wouldn't put hard brushes in the deair except that it might wear out the commutator more quickly, considering how much more the deair spins that made sense so I always used the soft brushes. I would have to replace the whole assymbly every few years on either flow/deair when the dac had to be raised to 200 or more even with new brushes...the commutator the brushes rubbed on would wear out. Of course, even the new motors I had to put the dac at 200...a year earlier I was able to put a new one or new brushes in and only be at 180 on the dac...but my last year new motors and new brushes I had to start at 200, often going to 220 or more. There is no textbook answer aside from when you observe failure...either raising dac over 250 to get proper pressure or when you can't get proper pressure...but generally with hard brushes a year to year and a half...plan on every year. But pm kits come with those, I think it's the soft brushes (for deair) you have to buy separate but don't quote me, been a few years since I worked on F's. I recall a "general practice" of replacing the whole assembly new every 2 years or something...but I never did that...but that would be facility or company specific, I don't know that F has a set rule. I'll say again, even a brand new assembly was no better than a years old rebuilt one...both had to have a dac of 240 often times, so I really saw no point in a new assembly. not sure how they are now days though |
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Post by gnurk on Aug 22, 2022 12:03:46 GMT
use the correct brushes wisth the correct motor when you dont the brushes will wear out faster and so will the armature also you need the correct brushes in the flow due to it will spin at slower speeds and to reduce electrical noise
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Post by Brushy on Aug 22, 2022 19:54:31 GMT
I do Flow motors at about 3-4 year mark dependent on how busy your clinic is. If you do them upon failure thats a day your machine is down for no reason.
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