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doesn't apply here ...... Posted by Kevin K [Email] (#374) [Profile/Gallery] (more from Kevin K) on Tue, 27 Feb 2001 17:38:37 In Reply to: light loaded bearing fails is generally too low preload., KeithG, Tue, 27 Feb 2001 14:01:50 Members do not see ads below this line. - Help Keep This Site Online - Signup |
true that lack of load on high speed spindles will result in skid-wear, but that is not major failure mode in my experience, having analized 100's of industrial failed bearings.
the rear of the saab pinion pair is much more lightly loaded and does not fail. the front is more heavily loaded and fails. It starts with the preload, and radial and axial load vectors from the pinion mesh both increase the load on this brg, and decrease load on the rear bearing. The front was upgraded by saab in 89, and the Eriksson uppgrade for pre 89 boxes is even bigger.
A close tapered roller brg pair on a larger shaft will do a better job of load sharing ... but that's not the case in this box.
The front pinion sees severe loading in high hp saabs. Most brg vendors suggest EP oils (GL4/5) for severe service ... as long as the ep additives are from modern oils, not old corrosive brews.
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