HDD class: 4 – 6 tons, pit launch machine

Pit launched machine TERRA MINI-JET MJ 1600 – Strong and compact design

The compact HDD system TERRA MINI-JET MJ 1600 is one of the most powerful and most productive compact HDD systems, which is available worldwide. Powered by a proven 57 HP strong HATZ Diesel engine the MJ 1600 offers up to 6 tons of thrust and pullback force, 1.600 Nm of torque and a maximum spindle speed of 150 rpm. With its 52 ltr/min high pressure pump you can drill up to 50 m and backream up to 300 mm (depending on ground). Optionally the MJ 1600 can be equipped with a 95 ltr/min strong FMC pump.

Compact design

Due to its compact design the MJ 1600 can work out of a pit with dimensions of only 1.3 m x 1.3 m. The small footprint and the reduced noise level at the operator’s ear make the TERRA MINI-JET MJ 1600 user friendly and sustainable. The fast set up time and the increased movability helps you to operate your machine also in urban areas or family‘s backyard.

Double cylinder drive (patented)

Thrust and backreaming of the driving saddle happens by a direct double cylinder drive. This is free of losses, strong and reliable. This new idea from TERRA allows maximum drilling and backreaming forces. The double cylinder operates in both directions with 6 tons.


The drill rod connector is equipped with a subsaver. The replacement of the subsaver goes quick and is inexpensive.

Hydraulic cylinders

The MJ 1600 is fixed with four hydraulic cylinders into the pit. The integrated check valves assure that the machine cannot move in the pit.

Clear control panel

All components of the MINI-JET are clearly arranged. The integrated electrical control of the the drilling volume takes place by the control panel. For the locating monitor there is a 12 voltage connection. The launching cradle is equipped with a grounding stake and an electrical strike alarm. The automatic drilling and backreaming system adjust the speed within milliseconds to the ground. With this drilling assistant system even difficult drills can be done.

Fluid Rock Drilling

The MJ 1600 can be equipped with a fluid rock drilling hammer. With this hammer even rock drilling or drilling in mixed ground conditions is no problem. The control panel has an optional integrated connection for the air compressor.

High quality drill rods

The special drill rods of the MINI-JET are 0,5 m long. They are milled out of one single piece of steel. A bending radius of 15 m can be achieved – also unique worldwide. The drill rod guidance ensures a long lifetime of your drill rods. There is no welding point on the drill rods.

HATZ Diesel Power Pack

Powered by a proven 3 cylinder HATZ Diesel engine with 42 kW (57 HP) the MJ 1600 operates fast and reliable. The main features of the Power Pack are:

  • the Diesel engine operates at 2’050 r.p.m.
  • electrical adjustment of the engine speed
  • supersilent
  • low Diesel fuel consumption
  • with 2 independent hydraulic circuits
  • 70 ltr/min @ 205 bar (for the launching craddle)
    28 ltr/min @ 70 bar (for the mixing and pumping unit)

Mixing and Pumping Station

  • with separate 1’100 ltr-tank (290 gal) for Bentonite or Ejactomer
  • with support plate for 2 bags of Bentonite each 25 kg (50 lbs)
  • the Bentonite can be easily filled into the funnel mixing pump with 800 ltr/min (210 gpm)
  • injector (venturi jet)
  • 1’100 ltr (290 gal) of drilling fluid are mixed with Bentonite within 4 minutes high pressure drilling fluid pump of FMC
  • maximum drilling fluid volume: 52 ltr/min, optionally 95 ltr/min
  • maximum drilling fluid pressure: 70 bar

Surface launch equipment

  • For surface launch
  • Entry angle adjustable between 0°- 45°
  • With two anchoring plates
  • The anchoring plates are adjustable in every longitudinal position
  • For TERRA MINI-JET MJ 1400 and MJ 1600
  • Weight: 132 kg (290 lbs)
  • Dimensions: L=1.25 m, W=1.18 m (L=50″, W=46.5″)

Excavator Frame

  • optional for all TERRA MINI-JET MJ 1400 and MJ 1600
  • can be connected to the arm of an excavator or an mini excavator
  • allows very fast installation of the HDD machine in the pit
  • the MINI-JET may be driven by the hydraulics of the excavator
  • the excavator frame is slid onto the TERRA MINI-JET and connected easily
  • rotates 360° by a hydraulic motor
  • dimensions: L x W x H = 1.20 m x 0.71 m x 1.75 m (3.96 x 2.13 x 5.78 ft)
  • weight: 240 kg (530 lbs)
Technical Data

*   Depending on ground conditions
** Depending on drill rod size
Technical specifications can be changed without previous notice.

pullback force
6 t (60 kN)
13’200 lbs (6.6 US tons)
thrust force
6 t (60 kN)
13’200 lbs (6.6 US tons)
driving power
42 kW (57 PS)
42 kW (57 HP)
1600 Nm
1200 ft.lbs
drill rod rotation speed, 1st speed
150 U/min
150 rpm
Drilling fluid volume, max.
52 l/min
16 gpm
Drilling fluid pressure, max.
55 bar
800 psi
pilot bore diameter
ø 50 mm
ø 2″
maximum backream diameter*
ø 300 mm
ø 12″
maximum drilling length *
50 m
165 ft
drill rods, length
0.5 m
1.65 ft
drill rods, diameter
ø 30/40 mm
ø 1.2″ / 1.6″
minimum turning radius**
15 m
50 ft
Dimensions pit cradle LxWxH
1.11 x 0.60 x 1.27 m
3.66 x 2.0 x 3.8 ft
weight of the pit cradle
ca. 280 kg
620 lbs


Vedúci servisu

Dezider Baláž
Technické poradentsvo Putzmeister a Dynapac
Diagnostický technik
Tel. kontakt: +421 910 910 451
Email: servis@jamalsk.sk

Vedúci divízie cestnej mechanizácie

Ing. Otokar Macháček
Technické poradenstvo Dynapac a Terra
Diagnostický technik
Tel. kontakt: +421 948 332 182
Email: otokar.machacek@jamalsk.sk

Náhradné diely

Jakub Mihalik
Technické poradenstvo
Tel. kontakt: +421 903 721 664
Email: jamalsk@jamalsk.sk

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