Joy (former MTI), RR-1MB, Jumbo Drill

Hydraulic jumbo drills

Joy RR-1MB

  • Boom coverage of 6.07 m by 5.69 m (19’ 11” by 18’ 8”)
  • Intelsense drilling control system
  • Hydrostatic drive for lower profile and tighter turning radius
  • Diesel powered for tramming and electric powered for drilling
  • Jumbo hydraulics featuring variable displacement piston pumps
  • Tier III EPA & MSHA certified engine options
  • Montabert percussion drifter (HC-50 standard, HC-109 or HC-110 models available)

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The RR-1MB hydraulic jumbo drill, a single-boom hydraulic rig, is designed for drilling vertical, horizontal and angled holes in underground production or development headings. The RR-1MB has boom coverage of 6.07 m by 5.69 m (19’ 11” by 18’ 8”) and inner and outer turning radius’ of 4.19 m (13’ 9”) and 6.48 m (21’ 3”), respectively.

The RR-1MB features the Intelsense drilling control system, which includes the following features:

  • Collaring
  • Anti-jamming
  • Automatic water monitoring with feed return if low pressure is encountered
  • Auto return to start position after hole completion
  • Control levers for operating percussion, rotation, and feed

The RR-1MB also includes robust drilling and carrier hydraulics that feature variable displacement piston pumps; specifically:

  • Jumbo hydraulics: load-sensing, closed-circuit design for percussion, rotation, feed, and boom movements
  • General hydraulics: load-sensing, closed center circuit design for optimal efficiency
  • Steering hydraulics: load-sensing, closed center circuit design; stick steering with direct-acting control valve and two double-acting steer cylinders

Our ROPS/FOPS-certified, environmentally controlled operator’s cab uses advanced air filtration and a climate control system to insulate your operator from particulate matter and other harmful emissions. Noise is reduced significantly through the use of integrated insulation throughout the cab structure; in addition, vibration dampeners isolate the cab from the frame, ensuring a safe and comfortable ride. 

Weight 16,545 kg 36,400 lbs.
Maximum width 2.06 m 6 ft. 9 in.
Turning radius

4.19 m
6.48 m

13 ft. 9 in.
21 ft. 3 in.
Turning angle 38º 38º
Boom guide rollover 360º 360º
Boom extension 1219 mm 48 in.
Feed extension 1.524 mm 60 in.
Boom coverage

6.07 m
5.69 m

19 ft. 11 in.
18 ft. 8 in.
Drifter Montabert HC 50
Tires 12.00 x 20
Cable reel - type G-GC 76.2 m 250 ft.

Montabert drifters

Our industry-leading Montabert drifters mean you receive the best possible drifter for your drill rig. Montabert HC series drifters have consistently, over the years, provided the lowest-per-drilled meter costs as compared to other drifters on the market.

Montabert drifters are known for:

  • Longest maintenance intervals, resulting in highest availability
  • Lowest maintenance costs
  • Reliability
  • Faster drilling speeds
  • Lowest tool consumption
  • Easiest to operate
  • Highest penetration rates
  • Lowest noise level

Montabert drifters provide maximum shock wave transmission; piston shape improvements mean that most of the shock energy goes directly to the bit, without tool fatigue. In addition, Montabert drifters excel in energy recycling; rebound energy is re-injected in the supply circuit, allowing the rebound energy to be used for the next cycle.

The HC-50 drifter is ideal for small headings and bolting application and is designed to reduce the lead length of the feed.

  • Hole range: 45 to 76 mm
  • Percussion output power: 13 Kw
  • Blows per minute: 3750

The HC-109 drifter is ideal for production and development drilling and is designed for both underground and surface applications.

  • Hole range: 45 to 102 mm
  • Percussion output power: 18 Kw
  • Blows per minute: 2900

The HC-110MT drifter is ideal for production and development drilling and is designed for both underground and surface applications.

  • Hole range: 51 to 89 mm
  • Percussion output power: 33 Kw
  • Blows per minute: 4400
  • Air compressor and water pumps (sized for the application)
  • Cab (ROPS/FOPS certified) with climate control
  • Canopy (ROPS/FOPS certified)

Engine options

  • Mercedes OM904 EPA Tier III, MSHA certified
  • Cummins QSB4.5 EPA Tier III, MSHA certified


  • MTF 12 steel and hole
  • MTF 14 steel and hole
  • MTF 16 steel and hole