In timp ce modelele standard ale Seriei 3 beneficiază de o transmisie hidrostatică cu două viteze, care permite utilajelor să se deplaseze cu viteze cuprinse între 0-20 km/h, noul 121E HTS, împreună cu alte două modele mai mari, utilizează o unitate hidrostatică cu două trepte în combinaţie
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POCLAIN-CASE POCLAIN P3533058F, PRIESTMAN 234830, POCLAIN-CASE POCLAIN, VPI V7H3596, CATERPILLAR 7H3596, DRESSER-FURUKAWA 1253678H1, LANDINI MASSEY FERGUSON 1421301M1, 60CKB, CASE S113061, SAMSUNG-H.I. 9012-51906, CATERPILLAR 2F1009, JCB 826/00301, ROCK-EXCAVATORS 01636, LIEBHERR 4097516, CATERPILLAR 2B9511, POCLAIN-CASE POCLAIN F3533058, BERCO CR429B, CATERPILLAR 4K7038, CNH-FIAT NEW HOLLAND 578633, LIEBHERR 485522914, BERCO CR429, BENATI 2002016, FAI 820510440, ITM D01040C0N15, Surub papuc, EXTEC VCR0429B, KOMATSU UTILITY 820510504, CNH-FIAT NEW HOLLAND 79012420, Excavator, POCLAIN-CASE POCLAIN ZKI3533058, LARSEN & TOUBRO H20133011