If you have a D-356, D-556, or a D-756, no dedicated operating manual is available. This series is a combination of the D-316 and D-357. You will need to refer to both manuals: the D-316 manual will cover the internals of the aluminum brake and can be found in the link below.  The D-357 manual will cover information on the trunnion support system.

Some parts may be available for these units — we recommend that they be upgraded to strain gauge units. However, if you replace the rotors/stators, the new parts will be aluminum bronze instead of aluminum. Contact us to discuss upgrade options. There are an assortment of photos below that may help you to identify your dynamometer.