hydraulic transmission 40 years manufacturing experiences Export to more than 20 ... ZCM3.12-12500/B-F-K-Y three grade hydraulic transmission is specially developed for pump trucks,shipping, crane and ... of big reduction ration, low speed, high torque, small size, light, convenient install, reliable working, ect. To be more details, ... 5A2F12W6.1–580 ZCM Two, Three, Four Grade Hydraulic Transmission(Gearbox)