The Peerless VST 205, including VST 205-205-025C, was sold as not serviceable in the field, and I do not believe there is a service manual. There is just a one page parts list, showing external parts only. Not even dealers were allowed to dismantle them. A diagnostic guide was provided to determine whether a replacement or changeover transmission was required. It is at pages numbered 120 and 121 (that is, the last two pages of the book) here:
http://www.smallenginesuppliers.com...cumseh_Transaxle_Service_Information.pdfThe VST was replaced by the LTH, which addressed some characteristic problems of the VST and unlike the VST had some potential to be repaired in the field. There were conversion kits for fitting LTH in place of VST. From a cursory reading of the literature it seems to me that the VST was not a great success.