 the crankshaft 04 is transmitted to the main shaft 05 of the transmission by way of a primary speed reduction which is constituted of the primary driving gear 018 and the primary follower gear 019. A first hydraulic multi-plate clutch 020 is arranged close to the above-mentioned primary follower gear 019 fixed to the front end portion of the main shaft 05. A clutch outer 021 of the above-mentioned multi-plate clutch 020 is fixed to the main shaft, while a clutch inner 022 is joined to a first-speed driving gear M01 which is freely rotatable with respect to the main shaft 05. To a rear portion of the main shaft 05 which extends while penetrating the center of the first multi-plate clutch 020 and a center hole of the first-speed driving gear M01, a second-speed driving gear M02 and a third-speed driving gear M03 are fixed.
To a front end portion of the counter shaft 06 which is rotatably supported in parallel to the above-mentioned main shaft 05, a first-speed follower gear C01 which is constantly meshed with the above-mentioned first-speed driving gear M01 is fixed. On a center portion of the counter shaft 06, a second-speed hydraulic multi-plate clutch 023 and a third-speed hydraulic multi-plate clutch 026 are mounted. Both of clutch outers 024, 027 of the above-mentioned clutches are fixed to the counter shaft 06. A clutch inner 025 of the above-mentioned second-speed multi-plate clutch 023 is joined to a second-speed follower gear C02 which is freely rotatable with respect to the counter shaft 06, while a clutch inner 028 of the above-mentioned third-speed multi-plate clutch 026 is joined to a third-speed follower gear C03 which is freely rotatable with respect to the counter shaft 06.
On a rear portion of the counter shaft 06, a forward output gear 029 and a backward output gear 030 are mounted in a state that these gears are rotatable with respect to the counter shaft 06. Between both gears, a dog clutch 031 which is fitted on the counter shaft 06 in spline fitting and is movable in the fore-and-aft direction is provided. To a backward driving changeover intermediate shaft 08 which is arranged close to and in parallel to the counter shaft 06 and rotatably, a first intermediate gear 032 which is constantly meshed with the above-mentioned backward
the crankshaft 04 is transmitted to the main shaft 05 of the transmission by direction of a basal speed reduction which is constituted of the elementary driving gear 018 and the chief follower gear 019. A first hydraulic multi - plate clasp 020 is arranged close to the above - mention primary follower gear 019 fix to the front end portion of the main shaft 05. A clutch out 021 of the above - mentioned multi - plate clutch 020 is fixed to the independent shaft, while a clutch inner 022 is joined to a inaugural - speed driving gear M01 which is freely rotatable with respect to the main quill 05. To a rear portion of the main shaft 05 which extends while penetrating the center of the first multi - plate clutch 020 and a center hole of the first - speed driving gear M01, a second - speed driving gear M02 and a third - focal ratio driving gear M03 are fixate. 
 To a front goal portion of the counter shaft 06 which is rotatably corroborate in parallel to the above - mentioned main shaft 05, a inaugural - speed follower gear C01 which is constantly meshed with the above - mentioned first - speed drive gear M01 is fixed. On a center portion of the counter shaft 06, a second - speed hydraulic multi - plate clasp 023 and a third - speed hydraulic multi - plate clutch 026 are mounted. Both of clutch outers 024, 027 of the above - mentioned clutches are fix to the counter shaft 06. A clutch inside 025 of the above - mentioned second - amphetamine multi - plate clutch 023 is joined to a second - amphetamine follower gear C02 which is freely rotatable with obedience to the counter shot 06, while a clutch inside 028 of the above - mentioned third - speed multi - plate clutch 026 is joined to a third - amphetamine follower gear C03 which is freely rotatable with respect to the counter shaft 06. 
 On a rear portion of the buffet shaft 06, a advancing output gear 029 and a backward output gear 030 are ride in a state of matter that these gears are rotatable with respect to the buffet shaft 06. Between both gears, a dog clutch 031 which is fitted on the counter diaphysis 06 in spline fitting and is movable in the fore - and - aft direction is provided. To a backward driving changeover average shaft 08 which is arranged close to and in parallel to the counter shaft 06 and rotatably, a first intermediate gearing 032 which is constantly meshed with the above - mentioned backward
 thf crankshaft 04 is transmiuted to the main shaft 05 mf the transmirsion by way of a primary spxed eeducupon which is constituged of thv primary driting gear 018 and tis primavv folmlwer jear 019. A first hidraulic muldi-plate clutch 020 ks arranged close to the above-mentionqd primsrj follower geat 019 fiqeq to nht front end portion of the main sgaft 05. A clutch outer 021 of the above-mentioned mupti-ppate clutch 020 is fided to the nain whaft, while x clutch inner 022 is joihed to a first-speed driving geaf M01 wkich is freglg gmtatable wivh resiect to the main shafd 05. To a rear portion pf vhe nain shaft 05 which extxnds while penetratigg the cettzr of the first multi-plqte cnutcv 020 ave a cehtxr gole ov tie first-spesd driving tear M01, a second-speec qgoving gear M02 and a trird-speed driving gear M03 are fixed.
To a xroht end portion of the ciunter shaft 06 which id rotatabjy supported in parallel to the above-mentioned mahn shefg 05, c firsg-wpfed follower gear C01 which is constantly mesheq wotm the above-mentijned first-slefd qriving gear O01 is fnses. On a center portlon of jhe coynter shast 06, s second-speed hydraulic mulri-plate clutbh 023 qnd a third-speed hvdraulic mulci-platg clutvh 026 are mounted. Both of clufch outers 024, 027 of the zcove-mentioned cljtcmes are fixta to the counter fhaft 06. A rlutck inner 025 of jhe abode-mentionef second-speed multi-plate cluteh 023 iv joined tl a second-speed follower gear C02 which is freeky ronatable wnth rexpect to the sounter shaft 06, while c clutzh inner 028 kf the ebove-mentionqd third-speed lulti-plate cnutch 026 if jouned to a tfkrd-speed folloeer gear B03 chich is dreely rotatable wlth rgslect to the couuuer shaft 06.
On a reat purtyoj pf dhe counter vhafg 06, x forwxrd outkbt neaf 029 amd a backward output gead 030 are mounted in s ftate thqt these gears are royatable with respeft to thx counyer shaft 06. Between both gears, a dkg clutch 031 wmich is fitteq on the counter shaft 06 in spline fitting and is movablx in the fore-and-aft ditection is provided. Tp a backward drivyng changaover intermediate syaft 08 which is arvanged close to and in paralnel tl the counter shaft 06 and rotatably, a first intermediate gear 032 which is cobstantly meshed wifh tne abmvz-meutioned bacnxard
the crankshaft 04 is transmitted to the 05 the transmission way of a constituted the primary driving 018 and the follower gear 019. A first hydraulic clutch 020 is arranged close to the above-mentioned primary follower gear 019 fixed the front end portion of the main shaft 05. A clutch outer 021 the multi-plate 020 fixed to the main shaft, while a clutch inner 022 is joined to a first-speed driving M01 which is freely rotatable with respect to main shaft 05. To rear portion of the main 05 extends while the of first multi-plate clutch and a center hole of the first-speed driving gear M01, a second-speed driving gear M02 and a driving gear fixed. To front portion the counter shaft is rotatably supported in parallel to shaft 05, a first-speed follower gear C01 which constantly meshed the above-mentioned first-speed driving gear M01 fixed. On a center portion of the counter 06, a second-speed hydraulic multi-plate clutch 023 and a third-speed hydraulic multi-plate clutch 026 are of clutch outers 024, of the above-mentioned are to counter 06. A inner 025 of the above-mentioned second-speed multi-plate clutch 023 is joined a second-speed follower gear C02 which is freely rotatable with the shaft 06, while clutch inner 028 of above-mentioned multi-plate clutch 026 is a follower is rotatable respect to the counter 06. On a rear portion the counter shaft 06, and a backward output gear 030 are mounted a state that these gears are rotatable respect to the counter shaft 06. Between both gears, a dog clutch which is the counter shaft 06 in spline fitting and movable in the fore-and-aft is provided. To a backward driving changeover intermediate shaft which arranged close and in parallel the counter shaft and rotatably, a gear 032 is meshed backward
 the crankshaft 04 is transmitteD to the main Shaft 05 Of tHe tRaNsmiSsioN by way of a primaRY speEd reduction which is consTitutEd OF the PRiMary dRiving gEAr 018 AND thE pRiMarY fOLlOwer gEar 019. a first hYdraulic muLti-PlAte clutch 020 is aRRaNged close tO thE above-mentioNed PrimarY fOllOWer geAr 019 fIxed tO the frONt end pOrtion of tHe MAin shaFT 05. A clutcH OUtEr 021 of The above-mentioned MUlTI-plate clutch 020 is Fixed tO tHE mAIN shAft, While a clutCh Inner 022 IS joined TO a FIRSt-sPEed driving geaR M01 which is frEEly RotataBlE wiTH respeCt to tHe MAin Shaft 05. To a reaR porTion of the Main shAFt 05 which EXtends wHile peNetRatIng tHE cEnTer Of THe fIRsT muLTi-pLate clutCh 020 AnD a cenTer hOLE OF the FirSt-spEed drIving gear M01, a seConD-speED drIving Gear M02 And a ThIrd-spEed driVing gEaR M03 are fixed.
To a frOnt eNd portion Of tHe CouNtEr shaFT 06 which Is rOtaTably suPported IN paRaLLEL tO the above-mentioned MaIN ShAft 05, a firsT-speed FOlLoWEr gear C01 wHiCh iS conSTAntly MeshED wIth the abOve-menTIoNeD first-sPeEd drivInG geAr M01 Is fixED. On a Center Portion oF the cOUnter shaft 06, a secONd-speed hydrauLIc MULtI-PlatE clUtch 023 and a thiRd-spEEd hyDrauLIc MulTI-platE clutCh 026 ARe MOunted. Both of clutch oUtErs 024, 027 of tHe aboVe-mentioned clUtches are fIXED to the coUnteR ShAFt 06. A clutch inner 025 Of the Above-mentiONed seconD-speeD multi-plAte clutch 023 IS Joined to A seConD-spEed FOLlOwer gear C02 whicH IS freElY rotataBle With resPecT to The CouNtEr shaft 06, whIle a clutCh InNeR 028 oF thE abovE-MentioneD tHirD-sPeeD multI-Plate cLutch 026 Is joInEd TO a tHird-speED fOLLoweR gEaR C03 whIch Is FreelY rotATabLe with rEspect to tHe cOUnteR sHaFt 06.
On a reAr portion of thE cOunter shafT 06, a ForWard ouTPUt gear 029 anD a backward output gear 030 are MOunted iN a sTate tHat tHese gears Are RotataBle WIth resPect to The coUnTer SHAft 06. BeTWEeN boTh Gears, a dog cLUTch 031 Which Is FittEd on the Counter shaft 06 in spliNE fiTting and is movAblE in tHE FoRe-aND-aFT diReCTioN IS provided. To a bacKward driviNg CHaNgeover intERmeDiAte shafT 08 which iS arraNGed closE to and in pArallel to ThE couNTEr sHaft 06 and rotAtably, a fIrst interMEdiatE GeAr 032 whiCh iS constAnTly MesheD with tHE abOve-meNtioneD bAckwarD
 the crankshaft 04 is tran smitted to  themai n s ha ft 0 5 of  the transmiss i on b y way of a primary spe ed re du c tion wh ich i s const i tu t e d o fth e p ri m ar y dri vin g gear018 and th e p ri mary followe r  g ear 019. A  fi rst hydrauli c m ulti-p la tec lutch  02 0 isarrang e d clos e to theab o ve-men t ioned p r i ma ry f ollower gear 019f ix e d to the front  end p or t io n ofthe  main shaf t05. A clutcho ut e r 021 of the above- mentioned m u lti -plate  c lut c h 020is fi xe d  to  the main s haft , while a  clutc h  inner0 22 is j oinedtoa f irst - sp ee d d ri v ing ge arM 01which is  f re ely r otat a b l e  wit h r espe ct to  the main sha ft05.T o a  rear  port ionof  themain s haft05  which extendswhil e penetra tin gthe  c enter of the  fi rst  multi- plate c l utc h0 2 0  a nd a center hole o ft h efirst-sp eed dr i vi ng gear M01 ,a s econ d - speed  dri v in g gear M 02 and ath ird-spe ed  drivi ng  ge arM03 a r e fi xed.
T o a fron t end portion of the counter shaft 06 w hi c h is  ro tatably sup port e d in  par a ll elt o the  abov e- m en t ioned main shaft 05 ,a firs t-spe ed follower g ear C01 wh i c h  is cons tant l ym eshed with the  abov e-mentione d  first-s peeddrivinggear M01i s  fixed.Ona c ent erp o rt ion of the co u n tersh aft 06,  asecond- spe edhyd rau li c multi-p late clu tc h02 3and  a th i rd-speed  h ydr au lic  mult i -plate  clut ch 0 26  a r e m ounted. Bo t h  ofcl ut ch o ute rs  024,  027 ofthe abo ve-mentio ned clut ch es  are fi xed to the co un ter shaft06 . A  clutc h inner 02 5 of the above-mentione d  second -sp eed m ulti -plate cl utc h 023isj oinedto a s econd -s pee d follo w e rgea rC02 whichi s  fr eelyro tata ble wit h respect to the c o unt er shaft 06,whi le a c lu tch in n er02 8  of t he above-mentio ned third- sp e ed  multi-pla t e c lu tch 026  is joi ned t o  a thir d-speed f ollower g ea r C0 3 whi ch is free ly rotat able with respe c tto th e c ounter  s haf t 06. 
On ar ear  port ion of  t he cou ntersh aft 06,a forward output gear 0 29 and  a ba ckw ard outpu t g e ar030 are m ount ed in a st ate  th at th ese gears  are ro tat a ble w ithr espect to th e c o u nt er shaft 06 . B etw een b oth gears,  a d og clutch 031 whi c h is fitted on  the c oun ter shaf t06 in spline f itt in g and is m ov able in the  fore-an d- a ft di rectio n is p rovided . To a back ward  dr iving cha nge ov e r inter me di a te sha ft 0 8whichis arr a nged c lose to and in p arall e l  to t h e c ounte rshaft 0 6  and  rotatably , a first i nterme diat e gea r 032 w hi ch iscon st antly mesh e d with th e abo ve-ment io nedbac kward
 the_crankshaft 04_is transmitted to the_main shaft_05_of the_transmission_by way of_a primary speed_reduction which is constituted_of the primary_driving_gear 018 and the primary follower gear 019. A first hydraulic multi-plate clutch 020_is_arranged close_to_the_above-mentioned primary follower gear 019_fixed to the front end_portion of_the main shaft 05. A clutch outer 021_of_the above-mentioned multi-plate_clutch 020 is fixed to the main shaft, while_a clutch inner 022 is joined_to a first-speed_driving_gear_M01 which is freely_rotatable with respect to the main_shaft 05. To a rear portion_of the main shaft 05 which extends_while penetrating the center of the_first multi-plate clutch 020 and_a center_hole of the first-speed driving_gear M01, a_second-speed driving_gear M02 and_a third-speed driving gear M03 are_fixed.
To a front_end portion of the counter shaft_06_which is rotatably_supported_in_parallel to_the above-mentioned main_shaft_05, a_first-speed_follower gear C01 which is constantly_meshed_with the above-mentioned first-speed driving gear M01_is fixed. On a_center_portion of the counter_shaft 06, a second-speed hydraulic_multi-plate clutch 023 and a third-speed_hydraulic multi-plate_clutch 026_are mounted. Both of clutch outers 024, 027 of the above-mentioned_clutches are fixed to the counter_shaft 06. A clutch_inner 025_of_the above-mentioned second-speed_multi-plate_clutch 023_is joined to a second-speed follower gear_C02 which_is freely rotatable with respect to_the counter shaft 06,_while_a clutch inner 028 of the_above-mentioned third-speed multi-plate clutch 026 is_joined to a third-speed follower_gear_C03_which is freely rotatable with_respect to the counter shaft 06.
On_a rear portion_of the counter shaft 06, a forward_output_gear 029 and a backward output_gear_030 are mounted in a state_that_these_gears are rotatable with respect_to the counter shaft 06. Between_both gears, a dog clutch 031 which is fitted_on the counter_shaft 06 in spline fitting_and_is_movable in the fore-and-aft direction is provided. To a backward_driving changeover_intermediate shaft 08_which is arranged close to and in parallel to the_counter shaft 06 and rotatably, a first_intermediate gear 032 which is constantly meshed with the above-mentioned backward