Patent ID: 7735394

Claim:
A tractor and transmission casing therefor, the casing comprising: a plurality of cylindrical casings each connected in the fore-and-aft direction, and comprising a main transmission casing incorporating a main transmission mechanism and a sub transmission casing incorporating a sub transmission mechanism; and a shaft support wall forming body detachably mounted on an inner peripheral portion of the rear end portion of the main transmission casing, in which a rear end surface of the main transmission casing is in facing contact with and connected with a front end surface of the sub transmission casing without interposing the shaft support wall forming body, an inner support wall is integrally formed on a front inner peripheral surface of the main transmission casing, wall receiving seats are formed on a rear inner peripheral surface of the main transmission casing, the shaft support wall forming body being detachably mounted on the wall receiving seats, and further in which a main transmission main shaft and a main transmission sub shaft comprising the main transmission mechanism are supported between the inner support wall and the shaft support wall forming body, and a slide body support shaft and a lever interlocking shaft comprising a main transmission manipulation mechanism are slidably arranged between the inner support wall and the shaft support wall forming body in the fore-and-aft direction, respectively.