Convertible top hydraulic cylinder seal kit Mercedes 2308000872 - rod seal AU

MJ Produkte Convertible top hydraulic cylinder seal repair kit Mercedes 2308000872 rod seal AU

Quantity	Unit price
From 1	$20.99*
From 2	$19.49*
From 5	$17.99*
From 10	$16.49*

Prices excl. sales tax plus shipping costs

Available, delivery time: 2-7 days

Product number: MJ10205 Brand: MJ Produkte®

We offer a seal kit / repair kit for the top hydraulic cylinder A2308000872 / 2308000872 / 230 800 0872 (front lock cylinder) used in Mercedes model SL R230. This repair kit includes the shaft collar that is needed to reattach the piston rod to the rod mount.

A lot of Mercedes convertible owners are aware of the well known problem: After a while the hydraulic cylinders responsible for opening and closing the soft top start leaking and do not work properly anymore.

The leak occurs when the installed o-rings and rod seals wear out to a point that they are not able to withstand the pressure inside the hydraulic cylinder anymore. This is especially noticeable during the summer in warmer regions since the original materials are limited in terms of temperature resistance.

For this reason we have the rod seals manufactured from affordable polyurethane (AU, red color) as well as heat and wear resistant Viton (FPM/FKM, brown color). Viton has the same mechanical properties as polyurethane, but has a far greater temperature resistance (from -20°C/-4°F to +204°C/+400°F) and is therefore the preferred material for vehicles in warmer regions. The shaft collar and the set screws are made out of 1.4404 / V4A / AISI 316L stainless steel that has superior corrosion resistance compared to standard V2A stainless steel. The rod seals and the metal parts are CNC-milled to our specification in Germany within tolerance class DIN ISO 2768-1-m to ensure a high level of accuracy.

A hydraulic cylinder contains a rod seal, an o-ring (depending on the model, not always installed) and a one- or two-piece piston seal (depending on the model). If the hydraulic cylinder is leaking, you'll need to replace the rod seal. If the hydraulic cylinder is not able to open and close the soft top properly anymore, you'll need to replace the piston seal.

Installation instructions:

- Removing the old shaft collar: Remove the snap ring at the end of the hydraulic cylinder where the piston rod exits the cylinder housing by prying it out. After than, the piston rod can be taken out of the cylinder. The factory shaft collar that is used to attach the piston rod to the rod mount is staked into place. Use a 3mm/3.5mm metal drill bit to drill out the staking on both sides of the old shaft collar (we recommend using a drill bit specifically made for hardened steel). After the staking is drilled out completely, remove the old shaft collar and pull the piston rod out of the rod mount. Proceed to remove the old rod seal and install our new seal (see our Installation guidelines for more details).

- Installing the new shaft collar: Push the piston rod into the rod mount and hold it there. Take the new shaft collar (without the set screws) and push it onto the end of the piston rod until it is fully seated. Now you can insert both set screws and screw them in using a 2mm hex bit, alternating between the two screws in the process to apply even pressure from both sides (tightening torque: 1.7 Nm / 15 in-lb). It is very important that you push the shaft collar down against the rod mount during the entire process in order to guarantee a tight fit. After ensuring that the shaft collar is positioned tight against the rod mount, you can insert the piston head into the cylinder and reinstall the snap ring.

Attention: Although the seals we offer have a high temperature range, they may only be used with the following types of hydraulic fluid to ensure smooth operation and a long service life:

- Genuine Mercedes Benz hydraulic fluid MB 343.0, hydraulic fluids in accordance with standard DIN 51 524, HLP 32 or standard ISO 11158, HM 32

Attention: The seal kits are referenced with the part number of the original hydraulic cylinder. Please make sure these match before you purchase a seal kit.