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Can't find a single or double row spherical roller to suit the OD x ID dimensions,so the cylindrical roller NJ204 would have to do. The SR is more desirable because it is self aligning where as the CR is not, but given the OEM was DGB this also is not self aligning so maybe not such an issue. As far as the seal goes pick the one which has the best operating temperature and the linear shaft contact speed is not exceeded.
Not sure what you mean by measuring shaft deflection as the loading on the shaft comes from the chain tangential force loads which would be difficult to replicate in the lathe.
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