The Futaba FUAS3091 case set is supplied as a replacement housing for the S9202, S9304 and S9403 servo models listed in the product name. The note concentrates on fit, assembly advice, and the role of the housing in general maintenance and tuning for model servos.
The parts are provided as a case set without original packing and act as like-for-like body replacements for the relevant servo assemblies. Before installation, check the model code on your servo to ensure it reads S9202, S9304 or S9403 to confirm fitment.
Assembly advice: switch off the radio system and remove the servo from the model before opening the case, keep centring marks visible and preserve any original bearings or shims when transferring internals. These cases are intended to house your existing components rather than change gear ratios or electronics, supporting repair and maintenance tasks.
For maintenance and tuning, a replacement housing can recover mounting points and horn alignment following impact or wear, improving steering repeatability and making reassembly simpler. Always re-check servo centre and endpoints after rebuilding and run a bench function test before refitting.
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