The Doofor DF550S Rock Drill is a high-frequency Hydraulic Rock Drill specially designed for Surface Production Drilling and general Tunnelling Work. 
The rotation motor of the Doofor DF550S is installed on the top side of the rock drill.
The DF550S Rock Drill has a separated flushing box. Flushing media can be water or air.
Flushing parts are available in brass or in stainless steel to avoid corrosion caused by saline water.
Optimal maximum hole diameter for the DF550S is 76 mm [3”].
The DF550S Rock Drill can be equipped with shank adapters (striker bars) R38, T38, and T45.
This Rock Drill can be equipped with stainless steel, a separated flushing head for Underground Mining, Bolting, and Grouting applications.
 
SUITABLE APPLICATIONS:
Surface, Underground
 
 
TECHNICAL SPECIFICATIONS:
Nominal power class
17 kW
Percussion pressure
160 bar
(Percussion oil-flow)
(90-120 litres/min)
Rotation motor*
125 cm3
Speed max.
250 rpm
Torque*
796 Nm
Oil flow*
40 litres/min (max 90 litres/min)
Gear ratio
65/40
Lubrication
Air-oil mist, min. 200 g/h
Flushing air pressure.
5-7 bar
Flushing air flow
4000 litres/min
Flushing water flow
150 litres/min
Weight
178 kg
*) Motor options are 125 cm³, 160 cm³ and 200 cm³. Number given is for standard rotation motor (125 cm³) at an intermittent pressure of 275 bar [3989psi].

**) Number given is for standard rotation motor (125 cm³) at an operating pressure of 175 bar [2466psi].
 
 
NOTE: The feed force (pressure) must be adjustable during operation.
The rotation torque and oil flow values given are for a typical rotation motor. See the full brochure for detailed information on different rotation motors.
The percussion pressure mentioned is a recommended value for a typical application. The product is intended for professional use by skilled personnel.
Doofor reserves all rights for changes without prior notice.