1993 500E tandem PS/SLS pump?

[fret500E]

Hello, Sam here - New member and new to the 500E world. currently recommissioning my 500E that my late father and I imported from the USA in 2014 (it has been sat in storage) just wondering if anyone can help me source a replacement PAS pump?

The car is currently with an MB specialist nearby awaiting parts. i am told either A1294602780 or A1294602880 would be correct for the car? can anyone point me in the right direction for either a rebuild kit or a replacement

Thanks,
Sam

 

[gsxr]

-27-80 is a Vickers/LuK brand tandem pump.
-28-80 is a ZF brand tandem pump.

Rebuild (seal) kits for either one should be available, OE/dealer kits preferred. The 2 different brands use different seal kits, so check the part number on your existing pump before ordering the seal kit. The part number is stamped on a plate on the side of the pump.

There is a place in USA that will rebuild your existing pump if you send it in, but I don't know if they have any on the shelf to sell as exchange units:

Contact

Phone: Technical help line - 702-734-8090 All other calls - 702-326-6718 Fax: 702-734-8091 Email: mark@candmhydraulics.com

www.candmhydraulics.com

 

[gerryvz]

You'll have to look at the label/tag on your pump to determine whether it is a Vickers/LuK unit, or a ZF pump. That will determine the kit you get, if you decide to go the self/shop rebuild route. There really isn't a downside to rebuilding the pump (or having a shop do it) as it is not that difficult -- the primary challenge that many have faced is removing the pump from the front of the engine.

There is a comprehensive HOW-TO article, with photo illustrations, here on the forum that provides step by step directions on how to remove and rebuild the pump. A number of folks have done it themselves using these instructions.

Good luck !!

And

 

[fret500E]

Thank you both for your help. The shop are in the process of stripping the car down to remove the pump - I will report back which pump it is!

Thanks again,
Sam

 

[RicardoD]

Part number for rebuild seal kits for the ZF Pump is 000 460 37 80 I believe this is currently NLA.

And you want the snap ring as well: 002-994-26-35

Search is your friend. I few threads on this.

 

[RicardoD]

Oh, one more thing, how was the need for a pump rebuild diagnosed? I was told same by my shop but the guys on here set me straight by first figuring out the type of fluid leaking. If it is power steering fluid then usually it is that hose underneath the power steering reservoir that is the problem (as it was on my car, only has a power steering fluid leak). However if it is SLS fluid leaking then you should rebuild the pump. If your pump is out of the car a rebuilt does make sense however as a preventative maintenance item but if you are tight on funds / time / effort that perhaps your pump is fine.

 

[fret500E]

Oh, one more thing, how was the need for a pump rebuild diagnosed? I was told same by my shop but the guys on here set me straight by first figuring out the type of fluid leaking. If it is power steering fluid then usually it is that hose underneath the power steering reservoir that is the problem (as it was on my car, only has a power steering fluid leak). However if it is SLS fluid leaking then you should rebuild the pump. If your pump is out of the car a rebuilt does make sense however as a preventative maintenance item but if you are tight on funds / time / effort that perhaps your pump is fine.

Thanks again for your input.

I have spoken with the shop this afternoon. They actually think they can fix the pump. The underside of the car was covered in power steering fluid (the pump is actually powering correctly) i am sure once the shop is fully back open after Covid-19 has been contained that i will know for sure what is needed.

Sam

 

[gsxr]

If the fluid leaking is indeed power steering fluid, the problem is most likely NOT the pump itself, but one or more hoses as RicardoD mentioned.

The primary way the pump "fails" is leaking SLS fluid out the front shaft seal. But this will only leak SLS fluid, not power steering fluid. They are separate circuits, hence the name "tandem" pump. If you are losing a lot of SLS fluid, then the pump may need a re-seal.

The OE fluids for SLS and P/S are both a honey/gold color, making it difficult to tell what fluid is leaking. If the leak is large enough you just look at which reservoir is abnormally low on fluid.

 

[RicardoD]

In my case I was able to confirm my P/S fluid was dropping in the reservoir while my SLS fluid did not. So once again I went in and fixed that little hose under the power steering reservoir. How-To for that is here:

HOW-TO: Reseal Power Steering Fluid Reservoir and Replace Short 15mm Hose | "HOW-TO" Tutorial Articles

I hope Gerry doesn't mind but this How-To is partially edited version of Gerry's How-To on removing and resealing the Tandem Pump for the SLS (self-leveling suspension) and Power Steering (click here for the full thread). That awesome thread notes that if you are having a power steering fluid...

www.500eboard.co

If you car is in the shop, not running, pump out of the car, then diagnosis at this point may be difficult. So perhaps rebuilding is the right thing to do.

 

[TimL]

-27-80 is a Vickers/LuK brand tandem pump.
-28-80 is a ZF brand tandem pump.
There is a place in USA that will rebuild your existing pump if you send it in, but I don't know if they have any on the shelf to sell as exchange units:

Contact

Phone: Technical help line - 702-734-8090 All other calls - 702-326-6718 Fax: 702-734-8091 Email: mark@candmhydraulics.com

www.candmhydraulics.com

I called Mark three weeks ago and he had a -28-80 on the shelf that he could refurbish. I purchased and received it and was supposed to send him my -27-80 back as a core, but since MB up here is closed I was not able to do so, as the leaky -27-80 unit is still on my car. He might have some more stock, so you might just want to give him a call

 

[linjam]

I called Mark three weeks ago and he had a -28-80 on the shelf that he could refurbish. I purchased and received it and was supposed to send him my -27-80 back as a core, but since MB up here is closed I was not able to do so, as the leaky -27-80 unit is still on my car. He might have some more stock, so you might just want to give him a call

I did my PS pump this past week. Mark at C and M Hydraulics sent me a remanufactured ZF pump, which cost me $325 plus $100 core charge, which I received back after I sent Mark my Vickers pump afterwards. Both Mark and my tech said it was no big deal to fit the ZF pump instead of the Vickers. The only difference is the angle at which the hose comes out of the top. No big deal.

Jamie

 

[TerryA]

I called Mark three weeks ago and he had a -28-80 on the shelf that he could refurbish. I purchased and received it and was supposed to send him my -27-80 back as a core, but since MB up here is closed I was not able to do so, as the leaky -27-80 unit is still on my car. He might have some more stock, so you might just want to give him a call

Tim,

Would you mind sharing the price for the re-build.

Also contact info.

Thanks

 

[TimL]

Tim,

Would you mind sharing the price for the re-build.

Also contact info.

Thanks

Hello Terry,

Mark’s contact is as follows:

Contact

Phone: Technical help line - 702-734-8090 All other calls - 702-326-6718 Fax: 702-734-8091 Email: mark@candmhydraulics.com

www.candmhydraulics.com

Price point was $430, including shipping and core charge of $100. Pump has been in the car since April now and not a drop of fluid has seeped out- really happy with their work

 

[TerryA]

Hello Terry,

Mark’s contact is as follows:

Contact

Phone: Technical help line - 702-734-8090 All other calls - 702-326-6718 Fax: 702-734-8091 Email: mark@candmhydraulics.com

www.candmhydraulics.com

Price point was $430, including shipping and core charge of $100. Pump has been in the car since April now and not a drop of fluid has seeped out- really happy with their work

Tim,

Thanks for the info. I have a spare tandem pump in my very small hord. I had plans of rebuilding it myself as practice but this sending it out is another possibility.

Thanks Again