Every one of these pumps I have ever seen need resealing. The seals and o-rings become just too hard over all those years of use. This is the most complete SLS (self leveling suspension) pump overhaul kit on the market today. Not only does it come with all the correct seals and gaskets, but it includes two special tools and complete step-by-step pictorial instructions to help you successfully complete the job in record time. We even throw in the correct gasket sealant! We ship two each of the larger o-rings just in case you damage one.... The seals are made out of Nitrile 70 Durometer material.
Why would you need to overhaul your pump? If your shaft seal is damaged the pump could be leaking hydraulic fluid into your engine... not good! Internal o-rings lose their seal thus reducing pump pressure. This can lead to rear end sage. On a couple wagons I have done nothing more than overhaul the pump and the suspension has raised up 1 to 2 inches in the back!!! All these pumps are now 20 plus years or older. They all need inspecting and resealing if they have never been opened up previously.
Below is picture of over plate removed from pump housing:
Note: This is only a reseal rebuild kit. It will not fix a worn out pump. (Evidenced by scoring of the internal metal parts).
Here is a little trick I recently discovered that is not in the instructions. This is for pumps that have been sitting for years or have corrosion inside. It can be very difficult to remove the center section from the pump housing. Either warm up the aluminum housing with a propane torch or place the entire pump in an oven at 350 degrees for 20 minutes. The heat will make it much easier to remove the center piece.
ALWAYS do a complete system fluid flush and filter change BEFORE rebuilding the pump. This increases seal life as well as reduces the chance for internal comtaminant scoring.
For 300TD Wagon 190E 16V 560SEC 560SEL and Other Euro Models
ALWAYS replace any deteriorating hydraulic BEFORE rebuilding the pump.
For 123 300TD Wagon, 450SEL 6.9, 190E 16V, 500SEL, 560SEL and other models with SLS
How to view the PDF digital instructions:
Once you complete the purchase of this product you will be able to download the digital instructions immediately when you are logged in and on your personal account page (click on My Account). Any PDFs will show up under My PDF Manuals. You will be allowed three downloads, so please save the file on your machine for backup.