This is specifically applicable to anyone I sell a steering box to. If you buy a re-manufactured box for your w123/w123/r129/etc this will also apply.


This is a DIY guide for the removal and replacement of a steering box for w123/w126 chassis specifically. These directions are also applicable to W115, W116, R129 but have a few differences peculiar to each chassis.



Section 46 in the FSM is where steering information can be found. This DIY is covered by 46-310, Removal and Replacement of Steering. Which can be found, along with the rest of the w123 manual at startekinfo.com --->Workshop Resources--->W123 manual--->[Specific model]--->Chassis and Body Manual--->Steering


If you're interested in what goes into reconditioning these steering boxes the definitive guide can be found atWhat a feeling it will be! A properly adjusted W123 / W116 / W126 power steering box



Before beginning I have to make it clear that this repair is to be done if you feel comfortable working on your car. Getting this repair wrong can negatively effect your ability to steer your vehicle, which may endanger yourself as well as other drivers. If you don't feel comfortable doing the brakes on your vehicle, stop here and have a professional work on your steering box.


Also note that a replacement steering box will not solve all of your problems (unless of course your problem is a worn out or leaking steering gearbox). I or any other supplier would gladly sell you a steering box, but please be diligent and inspect/replace the rest of your steering linkages (tie rods/ drag link/ idler arm bushing) and front suspension components (upper and lower control arm bushings/ ball joints/ wheel bearings) BEFORE replacing a steering box. These boxes are pretty robust and while they can be the cause of play other items usually wear first.