The UDL391RH is suitable for medium and deep hole drilling in production roadways with a working section of 3.9 m × 3.9 m or larger. Adopting a simple and practical design philosophy, it features high reliability, high productivity and low operating costs.

The UDL391RH is equipped with a high-power diesel engine, heavy-duty four-wheel drive, articulated steering chassis and FOPS-certified safety canopy. Fitted with a 22 kW Sandvik LD120SH hydraulic rock drill, the rig achieves higher and stable penetration rates and longer drill tool service life in various rock types. The automatic control functions of the THC drilling hydraulic system enable operators to focus on safe, rapid and accurate drilling operations.

The well-conceived overall layout delivers excellent travelling stability and good operator visibility. The rig is easy to operate and maintain, and all routine maintenance can be performed at ground level.