ZY series of loaders are crawler hydraulic transmission and hydraulic control loaders whose engines adopt Stair supercharged diesel engines. The transmission system is mainly composed of torque converter, shaft coupling, gear box, central transmission and steering clutch, and final transmission, etc; walking mechanism is mainly composed of bogie frame, unilateral bearing wheel, bilateral bearing wheel, guiding wheel, riding wheel and crawler. Working device is composed of bucket, movable arm and joint-bar parts; hydraulic system is mainly composed of torque converter hydraulic system, steering hydraulic system and working device hydraulic system; control system is mainly composed of throttle, speed changing, steering and braking, and working device control systems, etc.