The frame is secured to internal boss on a transmission casing , which is fastened to the rear of the front housing and has an open front end, and is used for supporting respective one ends of transmission shafts for {HEAD ~ both} of an additional speed change mechanism , which is disposed within a rear half of {TAIL ~ the front housing}, and a main speed change mechanism which is disposed within a front half of the transmission casing 
The frame is secured to internal boss on a transmission casing , which is fastened to the rear of the front housing and has an open front end , and is used for supporting respective one ends of transmission shafts for { HEAD ~ both } of an additional speed change mechanism , which is disposed within a rear half of { TAIL ~ the front housing } , and a main speed change mechanism which is disposed within a front half of the transmission casing
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