Old post but if this can help. Appears pretty identical to my Victa rotary tiller. Gear case tiller Series 9 Model 355. It has a B&S 5hp 130202 Type 0523 Code 0179050906. Gear case assembly TM64073A. I have tried Google on TM part numbers, but with no success. Gearbox oil - manual says 6.5 ounces Pennant oil EP 35000. I have been using gear oil sae 90 and some pumps of grease. (Thanks for the note about oil additives and bronze bushes!). I guess if the worm drive packs then that is it. However, without having taken them out yet, I would imagine that the bearing and seals could be located locally. The castellated screw on the front is a bearing adjustment cap, but I have been unable to find any description of adjustment. Make sure thread is clean and can be turned in by hand until very slight pressure is felt, then back off until next hole will fit the cotter pin - at least that is how I have done it. Hope this may help someone. Americans seem to love their old machines and there are some really useful web sites.
