ZL-series transmission is special designed for ZL-series loader, including ZL20/30 transmission (i.e. BS428 transmission) for 2t/3t loader, ZL50DD hydraulic transmission for 5t loader and ZL60 hydraulic transmission for 6t loader. ZL20/30 transmission is of fixed-shaft multi-speed construction, mechanical-hydraulic control and separating installed torque converter. ZL50DD and ZL60 hydraulic transmissions apply planetary multi-speed and double-turbine 4-element torque converter, combining speed and torque variable as integral, and mechanical-hydraulic control.