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Suspension tandem pump failure - Need replacement pump
- Thread starter Lcross
- Start date
Send it to Jono at Blueridge Mercedes for rebuild. He will do it right. Or find one at a junkyard. The same pump fits a lot of Mercedes models. Make sure which model pump you have. There are 2 manufacturers ZF or Vickers/LUC. Most are ZF in USA.
Also the is a How To on rebuilding the ZF pump.
Good Luck
Also the is a How To on rebuilding the ZF pump.
Good Luck
Based on recommendations from GSXR and others, I sent my tandem pump to C&M Hydraulics and they did a fantastic job with it- quick, reliable, thorough. Will go back to him when the time comes when the steering box starts leaking, as C&M refurbishes those as well.
www.candmhydraulics.com
1993 500E tandem PS/SLS pump? | Brakes, Suspension and Steering
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...
www.500eboard.co
Contact
Phone: Technical help line - 702-734-8090 All other calls - 702-326-6718 Fax: 702-734-8091 Email: mark@candmhydraulics.com
Last edited:
Leaking PS fluid- clear, viscousWhat exactly is the failure mode? Leaking SLS fluid, power steering fluid, or some other problem?
Leaking PS fluid would be very unusual, as the PS circuit is in the rear half of the pump body. First triple-check to make sure the leak is not from either the PS fluid inlet hose above the pump, or the flange at the top of the pump with the inlet hose barb. It could be as simple as a loose hose clamp in this area, as @gerryvz discovered after he R&R'd the pump.
Remember that fresh SLS fluid is also clear, and it can be difficult to tell which fluid is which. SLS leaks are more common as the front shaft seal of the pump is the typical leak point. This is easy to pinpoint as the front of the pump will be wet below the shaft, and totally dry on the top half of the pump. The front seal requires pump disassembly to replace. Not fun.
Remember that fresh SLS fluid is also clear, and it can be difficult to tell which fluid is which. SLS leaks are more common as the front shaft seal of the pump is the typical leak point. This is easy to pinpoint as the front of the pump will be wet below the shaft, and totally dry on the top half of the pump. The front seal requires pump disassembly to replace. Not fun.
Another easy way to tell which type of fluid is leaking is to monitor the levels of the SLS reservoir, and the power steering reservoir.
From my experiences some years back and just over the past week, a power steering fluid leak from the short hose/reservoir (a gravity leak) will leak continually, even when not driving the car. In a seal type of leak, the liquid will get forced out of the seal when the shaft inside the seal is moving, and won't leak/seep nearly as much when the engine is not operating.
I would say that 80% of the time, a power steering leak is going to be at the "short" hose under the reservoir. The short hose leaking will result in fluid running down the side and below the pump, and you can see drips on the bottom of the tandem pump adjacent to the mounting plate that it is bolted to.
You can see all of the other connections of the power steering system, such as the screw-in metal "U" hose connection on the side of the pump, the return connection on the back of the PS fluid reservoir, and the "S" hose that is below and behind the tandem pump. If these are leaking, you will see fresh fluid on them.
Best if you can spray concentrated streams of brake cleaner all over and around the tandem pump and its connections, including in the short hose area, to clean away any accumulated dirt and such, and to provide a fresh clean surface to visually review any leaks or seepage.
From my experiences some years back and just over the past week, a power steering fluid leak from the short hose/reservoir (a gravity leak) will leak continually, even when not driving the car. In a seal type of leak, the liquid will get forced out of the seal when the shaft inside the seal is moving, and won't leak/seep nearly as much when the engine is not operating.
I would say that 80% of the time, a power steering leak is going to be at the "short" hose under the reservoir. The short hose leaking will result in fluid running down the side and below the pump, and you can see drips on the bottom of the tandem pump adjacent to the mounting plate that it is bolted to.
You can see all of the other connections of the power steering system, such as the screw-in metal "U" hose connection on the side of the pump, the return connection on the back of the PS fluid reservoir, and the "S" hose that is below and behind the tandem pump. If these are leaking, you will see fresh fluid on them.
Best if you can spray concentrated streams of brake cleaner all over and around the tandem pump and its connections, including in the short hose area, to clean away any accumulated dirt and such, and to provide a fresh clean surface to visually review any leaks or seepage.
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