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Tech Tip #59: ZF/Hurth Marine Coupler and Damper Plate 101

Useful guide for your ZF/Hurth Marine Coupler and Damper Plate

This Tech Tip is one in a series that we publish. We welcome your comments.

Check the Installation

For people who are experiencing abnormal coupling or damper plate wear we recommend that they check the installation of the plate to the flywheel, the splines on the plate, and the linkage on the marine transmission. These are always the first steps. Once you are confident the installation is okay and the damper plate is still serviceable, but you still have damper plate problems, consider balancing the damper plate or the damper plate/flywheel assembly.

Balancing Damper Plates

Using a Stewart Warner industrial balancing machine, we have developed a technique to dynamically balance the entire damper plate/flywheel assembly or just the coupler or damper plate for smoother operation and longer life. The couplings (for example the Centa coupling) used on a larger Hurth can be quite heavy and the damper plates used on smaller Hurths can be unbalanced. This has worked so well that we now offer balancing to all of our drive train customers. We now ship only couplings and damper plates that are balanced and within specs.

Installing a Damper Plate

Sometimes people ask if they should use Locktite on the threads of the bolts that mount the damper plate or coupling. The short answer is no. Indeed, we recommend that you use NevrSez on these bolts to facilitate later removal. It is a good idea to change the damper plate every time the transmission is serviced. In fact, ZF/Hurth will not warranty a replacement Hurth gear without a new damper plate being installed. NevrSez will make the removal of the plate an easy job.