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[CPAP] Whining siren noise and bearing replacement/repair
#1
I have a Resmed S8 that I have used for quite a few years. A great little machine. Recently the machine made a whining noise that progressively increased. Sounded very similar to a siren. I was pretty sure the bearings had worn. I didn’t want to spend the money to buy a new one when I am pretty sure I can fix the one I own. I began tearing into it as I no longer have a warranty to void.

With a long thin torx driver all of the outer screws came out with relative ease. The outer shell, with a little work, slid apart showing the airtight seals. I was careful not to damage the airtight seals. This revealed the circuit board and two connections, which were carefully removed and set aside. The rubberized steel casing that houses the motor appears to be one piece, but the rubberized top lid separates from the bottom. This revealed the inner motor housing, which has four screws to reveal the actual motor assembly. The bearings are held in place by a small c clip, once that is carefully removed, a little prying removed arbor and bearings.

The bearings on my machine were made by a company called NMB, model #R3HH. I looked around on the internet, as Resmed does not make bearings. The cheapest place I found the bearings was on Amazon. 8 bucks for two of them. These were made in Japan. I have used bearings on other projects. Be sure to stay away from bearings made in China as the quality control is a bit iffy. I am sure other machine bearings can be replaced in much the same manner.

Before reassembly I made sure to clean out any excess dust build-up. Reassembly was a snap, and the machine works as good a new.

I hope this helps. Good luck.Sleep-well
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#2
Nice!

Was there much dust/dirt inside?
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#3
I am amazed that you could find correct bearings.
Are those sealed or shielded bearings?
Perhaps you could post a photo of the bearing your pulled.
I'm just curious.

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#4
Bearings should have an identifying number stamped into them.
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#5
Nice that you were able to do this repair and extend the life of the machine. Smile
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#6
(04-23-2015, 01:38 PM)worn_out_in_lebanon Wrote: Nice that you were able to do this repair and extend the life of the machine. Smile

Since that's pretty much the only moving part, the life probably just got extended "a lot"! 8-)

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#7
Nice job and great information.

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PaytonA passed away in September 2017
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#8
(04-23-2015, 12:16 PM)justMongo Wrote: I am amazed that you could find correct bearings.
Are those sealed or shielded bearings?
Perhaps you could post a photo of the bearing your pulled.
I'm just curious.

They are shielded bearings. I will try to attach a pic. Google plus made the pic not very clear. The right bearing had a small amount of rust. The left bearing could have been used longer. But as a precaution, I changed out both.    
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#9
(04-23-2015, 12:13 PM)player Wrote: Nice!

Was there much dust/dirt inside?

Less dirt than I thought there would be after 7 years of use. Pretty much only on the leading edges of the fan blades and where the air made tight turns.
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#10
Would wanna tell us the run time?
I use my PAP machine nightly and I feel great!
Updated: Philips Respironics System One (60 Series)
RemStar BiPAP Auto with Bi-FlexModel 760P -
Rise Time x3 Fixed Bi-Level EPAP 9.0 IPAP 11.5 (cmH2O)
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