Papst motor service questions

Posted by twystd (A) on September 30, 2015 at 21:41:31

I finally completed my 3 month tube amp from hell build project. I doubt anyone worked so hard for 7 watts a channel! If anyone is interested, I'll post that on the Tube DIY Asylum in the next couple days. This has allowed me to pursue my DIY ROK TT project, while I'm breaking the amps in at the shop, and groove'n to tunes.

I started with trying to disassemble and service the Papst motor, that I want to spin my ROK L-34. The furthest I could disassemble it was to take off the top plate, and 4 side spacers, and take the bottom cap off of the thrust bearing. This left me with the armature, body (spins) and bottom plate and bushing still attached. I didn't want to force anything, is this as far apart as it gets? BTW, I do have a hydraulic press, if I need to use it.

On inspection there is about .010 inch end play (as close as I could determine with feeler gauges). Is that acceptable? there appears to be only a bushing at the bottom of the motor, and a small ball thrust bearing. The rest of the motor seems to spin like a top, supported only by the bearings at the bottom, as I can't find a bearing on the topside. I assume I'm not missing something obvious here.

I poured out the old oil, and put in new oil, and ran it in for a few hours, (I'll repeat this process several times). It runs super smooth, no noticeable vibration (a lot smoother than the ROK induction motor), and I can only hear the air moving from the fan part of the motor. Would this motor benefit, like the platter bearing does, with a silicon nitride ball bearing? What do I look for to determine signs of excessive wear? As far as I can tell, this motor seems to be in good shape. Any suggestions on how to better service it?

I was relieved to see how easy it was to adapt this motor, salvaged from a ROK N-33H belt drive, to my ROK L-34 idler. The motor top plate was already factory drilled for the four isolation mounts on the L-34 mechanism. All I had to do was get out my 10-32 tap, and tap the 4 holes for a bolt on motor swap...easy peasy. :-)

twystd

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Topic - Papst motor service questions - twystd 21:41:31 09/30/15 (1)

RE: Papst motor service questions - tubav 09:56:14 10/01/15 (0)

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