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 both of an additional speed change mechanism , which is disposed within a rear half of the front housing, and a main speed change mechanism which is disposed within {HEAD ~ a front half} of {TAIL ~ the transmission casing} 
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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 both of an additional speed change mechanism , which is disposed within a rear half of the front housing , and a main speed change mechanism which is disposed within { HEAD ~ a front half } of { TAIL ~ the transmission casing }
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