benzCL786

Ive been having a hydraulic pump issue in my cl500 (w215).
vehicle is a 2002 cl500 with 80k miles. abc and steering are working completely fine, other then the rattle noise itself.
Ive replaced the pump with a new tandem pump, along with a full hydraulic fluid change (done correctly by draining the system) and then followed by rodeo. Immediately after starting the car the noise still persists. Im not sure if i just got unlucky with a defective pump, or if it is something else thats causing the tandem to make noise.

any info is greatly appreciated.
thanks

biker349

are you sure it's the pump? check around with a stethiscope to pinpoint the noise.

benzCL786

yessir have checked to pinpoint location of noise and it is coming from inside the pump

benzCL786

to me it sounds like a bad/broken bearing inside the pump.
also the noise was exactly the same on the previous pump that was making noise

PelicanParts.com

It looks and sounds like a bad P/S pump.

FYI another possible cause:
The serpentine belt tensioner has been superseded five times, at least once due to failure issues.

Serpentine belt tensioner, superseded to
MB# 1122000970

roy@pelicanparts.com


.

kered

when you replaced the pump and filled the system did you pressurize the bottle to force the fluid into the pump?? I know if you don't do that the pump can create and airpocket and not push any fluid. It will cause the pump to be noisy but I have never heard one sound like that before.

cl500 probs

benzCL786 or any one else could please help and tell me how to do a proper tandem pump exchange. I bought another used tandem pump to replace the old one that was leaking and now i need to know how to properly replace it thank you.

cl500 probs

Is a "rodeo" or flush completely necessary what happens if u don't dont it if u replaced the pump

kered

The rodeo ensures that the system is bled of all air. Air will kill a tandom pump as it will trap a pocket in the pump and starve it of fluid.