Sandvik HL710S is a hydraulic top hammer rock drill designed for DL2710 and DL2720 underground longhole drills. It is capable of drilling Ø54 - 89 mm holes up to 38 meters in depth, using T35, T38, T45, T51 MF-rods or Ø65 mm tube rods.
The HL710S hydraulic rock drill is designed to ensure high drilling capacity, easy maintenance and low operating cost. The construction of the rock drill is based on the main body modules tied together with four short side bolts; this ensures minimum number of joint faces and large contact surfaces. The percussion module is simple in design and consists of only two moving parts – the piston and the distributor sleeve around the piston. The moving parts are not in contact with the rock drill body modules.
There are two rotation motor variants to meet the rotation torque and RPM requirements of different hole diameters and rock formations. The optional power extractor is used for opening rock tool joints manually. The design of the HL710S is covered by several patents.