Designed to endure
demanding environments


Doofor high-frequency hydraulic rock drill DF550L-2M
High-performance hydraulic rock drill

Doofor DF550L-2M is a high-frequency hydraulic rock drill specially designed for underground production drilling and tunneling. The DF550L-2M has a very low overhead, only 84 mm from the drill center line. 2M versions are equipped with two 160 cm3 OMS-series rotation motors. This enables continuous, a high torque of 1593 Nm and an intermittent torque of  1900 Nm while still maintaining high rotation speed.

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

The rock drill can be equipped with shank adapters (striker bars) R32, R38, T38, and T45. It can be equipped with stainless steel, separated flushing head for underground mining, bolting, and grouting.

Optimal maximum hole diameter for the DF550L-2M is 76 mm.

Technical Data
Nominal power class17 kW
Percussion pressure160 bar
(Percussion oil-flow)(90-120 litres/min)
Rotation motors*2*160 cm3
Speed max.250 rpm
Torque (2*160 cm3)*1900 Nm
Oil flow*2*40 litres/min (max. 2*90 litres/min)
Gear ratio65/40
LubricationAir-oil mist, min. 250 g/h
Flushing air pressure5–7 bar
Flushing air flow4000 litres/min
Flushing water flow150 litres/min
Weight192 kg

76 mm

Optimal maximum
hole diameter

17 kW

Power class

R32, R38
T38, T45

Shank size



*) Numbers given are for two standard rotation motor (2*160 cm³) at an intermittent pressure of 275 bar [3989psi]. Motor options are 80 cm³, 100 cm³, 125 cm³ and 160 cm³.

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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