S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Tandem pump rebuild

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Old Nov 6, 2025 | 03:38 PM
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Jacinto765's Avatar
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From: SF Bay area
1992 300SD, 2006 R350
Tandem pump rebuild

I am all finished up rebuilding and putting new seals in my vickers tandem pump part #140 466 15 01. It goes into my 1992 300SD, the issue I'm having is putting the main shaft back into the body of the pump. There are 4 spring loaded dowels that ride on the bearing on the main shaft that I can't figure out how to compress and get the shaft in. The YT videos I've seen use a ZF tandem pump and they put the bearing in first before the shaft, the issue with that is my bearing is held onto the shaft with a snap ring so I can't put it in first, it has to be all together as far as I know. I'm thinking there has to be a special tool I'm missing or some more disassembly, or maybe the bearing doesn't need to be attached to the shaft and the snap ring can be left out? I am lost and my pump is still in pieces, if someone has experience or some insight or ideas on how to get the shaft in I would greatly appreciate it.
These are the dowels I'm referring to
These are the dowels I'm referring to
This is how far the main shaft will go without compressing the dowels. Hardly any space.
This is how far the main shaft will go without compressing the dowels. Hardly any space.
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