Designed to endure
demanding environments

 

 

DF550L-EXT

High performance hydraulic rock drill

Doofor DF550L-EXT is a high frequency rock drill equipped with a hydraulic back hammer. The back hammer enables removing stuck drill steels from the rock and opening the threads of lines of drill bars in extension bar drilling.

The DF550L-EXT has a very low overhead, only 84mm from the drill center line. The rotation motor of the DF550L-EXT can be installed on the right hand or the left hand side.

The rock drill has a separated flushing box. Flushing media can be water or air.

Flushing head can be turned upside down. Motor can be on the left or right. Motor fitting direction can be specified (up, down or side). Accumulator valve direction can be specified.

Optimal maximum hole diameter for the DF550L-EXT is 76mm.

The rock drill can be equipped with male R32, R38, T38 or T45 shank adapter (striker bar).

Technical Data
Metric
Percussion power 17 kW
Percussion pressure 160 bar
(oil flow) (95-120 litres/min)
Rotation motor* 125 cm3
Speed max. 250 rpm
Torque* 796 Nm
Oil flow max.* 95–120 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 170 kg

76 mm

Optimal maximum
hole diameter

17 kW

Power class

R32, R38
T38

Shank size

AIR / WATER

Flushing

Feed force (pressure) must be adjustable during operation
*) Numbers given are for standard rotation motor (200cm3) at an intermittent pressure of 275bar [3989psi]. Motor options are 80cm³, 100cm³, 125cm³, 160cm³, 200cm³, 250cm³. For professional use only as a component of a hydraulic system.

Feed force (pressure) must be adjustable during operation. Rotation torque and oil flow values given are for a typical rotation motor. See full brochure for detailed information on different rotation motors. 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.

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