Bad bearings are not the only thing that will take out a vacuum pump. Lateral play in the intermediate shaft, causing the timing device to slam back and forth took mine out by driving the piston through the pump body. I always check the timing device for lateral play now when the VP is off, mine had 2.5mms.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"