D-356 / D-556 / D-756 Dynamometers
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 here: DA-315/516 Manual. The D-357 manual will cover information on the trunnion support system.
Parts are available for these units and they can be upgraded to strain gauge units. However, if you replace the rotors/stators, the new parts will be aluminum bronze instead of aluminum.