MNDswtiEaTVAnShhtCe3fNRimt5tIreUPas0nThgAsIeOmfauLNrilsyoTivosenRyrdiArcsihvNareonmrSiazenMdgieuI.mSTa-dhnuetIaytOrl5tnN-rssapmnes-imd,ioscnoins- istseTnphnohrplTigiesinfunhhttie,eanldfsatdhslvturpoaetihefvtthrsehohdetreauoantgsftrtdrtehahalinnestschslmtcmedsoietnismfasomieiuripesoercnashntdregttodiginhefcceaaptouroulsatuntrarhtsperhegoasetcfihassrttlppaaruaoienftntbnncsdhydm.iniTigmssgehoati.veoursinArnngmtgcaeoogdtutvehhandieest--. aT vh ae ltarb lne s min st w io n a gn e a rfo cua s-ew hc o n sl id trsiv o f ct ow fiag lu rma t in u m . nm e nt s mt o b e sg in t h ein st h ifnta ls e tqrua en s cme . A s t h se sifht ifct le vp eo r MANUAL TRANSMISSI ON NV3500
DES CRI PTI ON
The transmissi on is a medi um-dut y y 5-speed, constant mesh f fu ll y y s y ynchroni zed manual transmi ssi on wi th f fi f ft h gear overdrive range. The transmissi on is avail abl e i n two and f fo ur-wheel dri ve conf fi gurati ons. The transmissi on gear case consi sts of f two al uminum housi ngs (F i g. 1). The clutch housi ng is an i ntegral part of f the transmi ssi on f fr ont housi ng. A combi nati on of f rol ler and ball bearings are used to support the transmissi on shaf ft s in the two housings. The transmi ssi on gears all rotate on caged t y ype needl e beari ngs. A roll er beari ng is used between the input and output shaf ft . The transmi ssi on has a si ngle shaf ft shi f ft mechanism with three shi f ft f fo rks al l mounted on the shaf ft . The shaf ft i s supported in the f fr ont and rear housi ngs b y y bushi ngs and one li near ball beari ng. I nternal shi f ft components consi st of f the f fo rks, shaf ft , shi f ft l ever socket and detent components
splined to the transmission input shaf ft and is turned at engi ne speed at all ti mes that the clutch i s engaged. The input shaf ft is connected to the transmissi on countershaf ft through the mesh of f f fo urth speed gear on the input sha f ft and the f fo urth countershaf ft gear. At this poi nt, all the transmi ssi on gears are spinning. The driver sel ects a parti cular gear b y y moving the shi f ft l ever t o the desired gear posi ti on. Thi s movement moves the i nternal transmissi on shi f ft components t o begi n the shif ft sequence. As the shi f ft lever moves the sel ected shi f ft rail, the shif ft f fo rk attached t o that rail begi ns to move. The f fo rk i s positi oned i n a groove i n the outer ci rcumf fe rence of f the s y ynchroni zer sl eeve. As the shi f ft f fo rk moves the s y ynchroni zer sl eeve, the s y ynchronizer begi ns to speed-up or sl ow down the sel ected gear (depending on whether we are up-shi f ft ing or down-shi f ft ing). The s y ynchroni zer does this b y y havi ng the s y ynchronizer hub spl ined t o the mai nshaf ft and movi ng the bl ocker ring into contact wi th the gear ’s f fr i cti on cone. As the bl ocker ri ng and fr i cti on cone come together, the gear speed i s brought f up or down to the speed of f the s y ynchronizer. As the two speeds match, the spli nes on the inside of f the s y ynchroni zer sl eeve become ali gned with the teeth on the bl ocker ri ng and the f fr i cti on cone and eventual l y y wi ll sli de over the teeth, l ocki ng the gear t o the mai nshaf ft , or countershaf ft , through the s y ynchroni zer.
