Designed to endure
demanding environments


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

Doofor DF550L is a high-frequency hydraulic rock drill specially designed for underground production drilling and tunneling. The DF550L has a very low overhead, only 84 mm from the drill center line. The rotation motor of the DF550L 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. It can be equipped with shank adapters (striker bars) R32, R38, T38 and T45. It can also be equipped with stainless steel, separated flushing head for underground mining, bolting and grouting.

The DF550L can be equipped with heat resistant sealing for tap hole drilling.

Optimal maximum hole diameter for the DF550L is 76 mm.

Technical Data
Nominal power class17 kW
Percussion pressure160 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 ratio65/40
LubricationAir-oil mist, min. 200 g/h
Flushing air pressure5–7 bar
Flushing air flow4000 litres/min
Flushing water flow150 litres/min
Weight152 kg

76 mm

Optimal maximum
hole diameter

17 kW

Power class

R32, R38
T38, T45

Shank size



*) Numbers given are for standard rotation motor (125 cm³) at an intermittent pressure of 275 bar [3989psi]. Motor options are 80 cm³, 100 cm³, 125 cm³, 160 cm³ and 200cm³ (the 200 cm³ motor can be installed on the left-hand side only).

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.

©2019 Doofor Inc