Earl,

Thanks for chime in.
Yes, i agree, seems that the motor bearings fail first ...

In the beginning, i thought the planetary gear-bearings (3) was the "weak" point, but it seems that these bearings hold up just fine ,even at extended lube interval using a high quality grease. For this reason i will continue extending the lube interval on the planetary gears to meet the total bearing replacement for the rest of the motor, due to the motor bearing limit.

My goal : lube every 150 - change all bearings (total 7) at 300. The total effort is lower, and the total cost is reasonable.
The cost is relatively low to change bearings,even at Hacker germany, and the extra cost to change all the bearings, included the fan is low .. As mentioned above; the motor-bearing is the limit, and the job has to be done anyway..

Well, just my personal maintenance program.

Kjell Olav