The ZD(H)type reducers are mainly applied to craning, mining, general chemistry, textiling and light  industry. The applicable conditions are as follows.

The gear transmission circle velocity no more than 4m/s
The wheeling speed of high-speed axle no more than 1500r.p.m
The actuating temperature ranging from-40 to +40 .
The reducer being applied to right and reverse direction, 9transmission ratio,9 installing modes and 3 low-speed axle edge types.