Model DDR

Coal bolters

Fletcher Model DDR

  • Automatic disc brakes
  • Fletcher dust tanks
  • Four-wheel drive
  • High-pressure filters
  • JIC hose fittings
  • Front lift
  • Adjustable bolt torquing and thrust control
  • Cable reel
  • Tram compartment canopy

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With the Fletcher Model DDR Walk-Thru, you get dual head, angle or vertical drilling in lower seams than ever. The Model DDR offers a maximum straight line boom swing of 5.4 m to accomodate a four-bolt pattern on 1.2 m centers. The masts tilt 45 degrees for truss installations, 90 degrees for tramming.

  • 0.9 m chassis height, dual-head machine with angle drilling capability
  • A truss and rib bolter than can also be used as a production bolter
  • Walk-through chassis design eliminates the need for the operator to walk between the machine and the rib

Note

Joy is the exclusive distributor and authorized service provider for J.H. Fletcher & Co. products worldwide, with the following country exceptions:

Not a distributor or authorized service provider

  • United States
  • Canada
  • Mexico
  • Australia
  • Norway

Non-exclusive distributor and authorized service provider

  • Poland 
  • Latin America

Electrical system

  • Dual 37 kW motors
  • Horizontal axis cable reel
  • Lights

Dust collection

  • Internal through drill steel
  • Blower: 62 cfm rotary lobe type
  • Vacuum at drillhead: 12"-15" Hg
  • Fletcher dust tanks

Hydraulic system

  • Maximum working pressure: 2800 psi
  • Tank capacity: 470 liters
  • Filtration: Four magnetic in-tank, two high pressure, hand-operated fill pmp iwth screened intake
  • Hose fittings: JIC and SAE
  • Dual Parker P350/315 Series pumps

Drive system

  • Four-wheel chain drive
  • Tractor-type steering
  • Turns within length
  • Tram sepeed: 0-2.4 km/h
  • Staffa B80 serieswith motion control valves
  • Brakes: Automatic spring set, hydraulic release disc
  • Tires: 14.5 x 15 foam-filled
  • Front lift

Safety system

  • L type TRS
  • Driller canopies
  • Tram deck canopy

Drilling system

  • Linear sumping booms
  • Apollo telescoping mast feed
  • Thrust:3.1 ton
  • Feed length: 1.29 m to 2.05 m depending on mast size
  • Torque: 0-400 Nm
  • Drill rotation speeds: 0-560 rpm
  • Feed rate: 0-11 m/min
  • Boom extend up to .55m
  • Minimum drillhead separation: 1.2 m
  • Maximum drillhead separation:6 m
  • Adjustable bolt torquing valve
  • Foot-type boom stabilizers
 Maximum straight line swing  5.5 m
 Overall length  7.7 m
 Overall width  3.2 m
 Overall chassis height  0.9 m
 Wheelbase  1.8 m
 Machine mass  19050 kg
  • Feedback drilling system
  • Quick chagne motor mounts
  • Titan drill mast (4.5 ton)
  • Rock dusters
  • Downhole drilling attachment
  • Hydraulic drill guides
  • Adjustable wear pad support posts
  • Radio remote control tram
  • Five-bolt pattern capability
  • 3.3 m L-TRS assembly
  • Power extend TRS beam
  • Auto dump pre-cleaners
  • Hydraulic power takeoff
  • Rotary impact drillheads
  • Headlights
  • Crawler-mounted
  • Articulating tRS beam
  • Operator cooling fans
  • Heavy-duty tram w/0.91 m tires

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