Road-rail 4.9-t crawler crane
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Road-rail 4.9-t crawler crane MWR120UR

Features
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Road-rail crawler crane with the highest lifting load in the class

  • The highest lifting load in the 4.9-t class.
  • Provided with heavy weight railway equipment to ensure excellent stability on tracks.
  • The hydraulic pump with a high discharge rate increases the running and working speed.
  • Provided with rail clamps (patented) to work stably on unstable tracks, such as bridges.
  • Provided with an emergency engine unit, which ensures running even in case of trouble with the main engine.
  • Provided with a hydraulic circuit to enable installation of special attachments (gondola and earth auger).
  • The gondola turning mechanism enables working above overhead lines where conventional vehicles for high lift work are unusable. * Gondola type
  • Equipped with automatic stop device to prevent contact with overhead lines and trains traveling on adjacent tracks.
  • Equipped with insulated rubber crawlers dedicated to track work.
    Applicable to standard gauge (1,435mm) and narrow gauge (1,067mm) * Changeable to other gauges.
Road-rail 4.9-t crawler crane

Road-rail 4.9-t crawler crane

Moving image
Examples of work
Major dimensions
Major dimensions
Major dimensions Gondola type
Major dimensions  Gondola type
Working radius-lifting height diagram
Rated total load
Boom length / working radius (mm) 4.51-m boom 7.27-m boom 10.03-m boom 12.79-m boom 15.55-m boom
Rated lifting load in stopped state Rated lifting load in running state Rated lifting load in stopped state Rated lifting load in running state Rated lifting load in stopped state Rated lifting load in running state Rated lifting load in stopped state Rated lifting load in running state Rated lifting load in stopped state Rated lifting load in running state
1.00 4,900 2,000 4,900 2,000 Not
allowed
Not
allowed
1.50 4,900 2,000 4,900 2,000 2,600 1,400
2.00 4,900 2,000 4,900 2,000 2,600 1,400 2,000
2.50 4,900 2,000 4,900 2,000 2,600 1,400 2,000 1,400
3.00 4,300 2,000 4,300 2,000 2,600 1,300 2,000 1,400
3.50 3,600/3.45m 1,800/3.45m 3,550 1,775 2,600 1,300 2,000 1,400
4.00 - - 3,050 1,525 2,600 1,300 2,000 1,400
4.50 - - 2,650 1,325 2,400 1,200 2,000 1,400
5.00 - - 2,250 1,125 2,200 1,100 1,800 1,400
6.00 - - 1,650 825 1,800 900 1,500 1,160
7.00 - - 1,550/6.22m 775/6.22m 1,400 700 1,280 1,000
8.00 - - - - 1,100 550 1,100 870
9.00 - - - - 950/8.98m 475/8.98m 950 770
10.00 - - - - - - 800 700
12.00 - - - - - - 600/11.74m 570
14.00 - - - - - - - 350
14.50 - - - - - - - 320

• A load is hung with four wires in all cases.
• The load which can be actually lifted is the difference obtained by subtracting the weight of the hook and hanging tools, such as slinging wire ropes (hook weight: 80 kg), from the rated total load.

Principal specifications
Item MWR120UR MWR120UR (gondola type)
Specifications
Base vehicle Kobelco MWR120UR
Total working weight (kg) 16,700
Type of track roller Rubber integral insulated shoe
Fuel tank (L) 100
Dimensions
Overall length (during transportation) (mm) 5,721 8,996
Overall width (mm) 2,700
Overall height (on track) (mm) 2,928
Swing radius (mm) 1,480
Overall length of crawler (mm) 3,670
Performance
Boom length (m) 4.51~15.55
Max. lifting load × working radius (t×mm) 4.9×2,500
Max. working radius (mm) 14,500 10,000
Max. lift above ground level (mm) 16,500 10,000
Max. lift below ground level (mm) 26,300 -
Swing range (degrees) 360
Swing speed (rpm)

2.2

Max. speed of crawler (km/h) Low speed: 1.9 High speed: 3.3
Gradability (degrees) 35
Ground contact pressure (kgf/cm2) 0.58
Track running performance
Max. speed (km/h) 16
Max. gradient at which vehicle can start 30/1,000
Counterbalance braking distance (m) In fine weather: 18 m  In wet weather: 25 m
Braking distance (m) In fine weather: 10 m  In wet weather: 14 m
Major units
Item MWR120UR
Engine
Model Isuzu A-4JB1
Type 4-cycle water-cooled inline direct injection type with turbo
Total displacement (cc) 2,771
Rated output (PS/rpm) 41.9/2,200
Hydraulic unit
Type and quantity of hydraulic pumps Variable piston type, 2 pcs. + gear type, 2 pcs.
Hydraulic pump discharge (L/min) 66×2+12.1+19.6
Max. set pressure (kgf/cm2) 320
Type and quantity of control valves 6+1+1-spool valve
Operation method Hydraulic assist
Crawler running motor Variable piston type, 2 pcs.
Crane unit
Boom 5 stages/4.9 t
Rated lifting load (t) 4.9
Crane safety devices Overload prevention device, over-winding prevention device, load indicator, Height upper limit setting device, level board, inclination warning device
Gondola safety devices Gondola balancing device, gondola emergency stop device and column to prevent getting caught in gondola
Track running equipment
Wheel Diameter: 460mmWidth: 125mm, wheel back to back gauge: 990mm (narrow gauge), 1,360mm (standard gauge), 4 insulated wheels
Axle 2 axles (diameter 100 mm), 1 axle drive Distance between axles: 3,860mm
Motive power source Hydraulic motor with counterbalance valve
(output 96 kW, torque 1,530 N.m), 2 units
Drive Chain driving system for each axle
Brake Hydraulic disc brake for each axle (braking torque: 0.5 t.m) + counterbalance valve for each axle, with parking braking system escape lash prevention device
Safety devices in track
Emergency engine Air-cooled 4-cycle single cylinder diesel engine (406 cc, 10 ps)
Boom height limits automatic stop of boom
Boom insulation High voltage plastic sheet for electrical use (withstand voltage: 7000 V)
Other safety devices Hydraulic motor release clutch, hydraulic motor free valve, front and rear lamps, flasher, fence for crew, connecting hole and coupling rod
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