PSPump/rebuild
 

Ok, took power steering pump out, got new seal kit,,,,????
now what? Is there a schematic someplace?
Is it preety cut an dry?
2.2/190d/84
ZF model,I checked DIY links/articles..,,, nothin
braingears........were are you???

thanks
19DDiesel
mark

My advice would be too get all the little pump vains back in JUST AS THEY CAME OUT. Dont ask how I know:)

More on that pump...
 

Yes, and note that there is a polished, rounded side of those vanes, which should be oriented outward - into the pump 'chamber'. Doesn't look to me like these would tolerate 'reversal' very well.

Does anyone have a blowup for these pumps? I paid close attention to the disassembly, but wouldn't mind a schematic for a double-check.

Also, is everyone replacing the front shaft seal? Mine is so brittle, it's basically shot. (Yes, I've replaced mine).

Last, I don't even have the smallest O ring in the disassembled pump (never installed? dried out and ground up into dust?) Where does this O ring go? Into? or behind? the front shaft seal? Correction! My parts guys sold me the wrong rebuild kit - the correct one for my car has only two O rings.

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Update: this project is now done, and the power steering is better than it's ever been. One gotcha: I made the mistake, initially, of not fully compressing the three internal elements of the pump 'core': front plate, ovoid pump 'chamber' and the backing plate. Correct assembly can be tested by checking the back-and-forth play in the shaft; there should only be less than a 1/16th inch from the shaft-rotor play, and no more.

I had not compressed these parts fully, and the loading spring was not adequate to push them together once assembled. Result? No pump pressure! Easy to fix with a correct reassembly.

Some part numbers; hopefully this will help someone out there (this is all for a W126, an '83 300SD):

Pump details: ZahnradFabrik Friedrichshafen A.G. (Schwab. Gmund)
Mercedes #: 126 460 1480 type: 767 2900 446
Gasket Kit: A 000 586 84 46
(2 O rings, one Aluminum washer for pressure valve cover)
Front Shaft Seal: A 018 997 60 47
Filter: A 000 466 21 04

Thanks all as always for all your good feedback. Lou