Road-rail power shovel
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Road-rail power shovel MPS78UU-6 / MPS75UU-12・3

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Road-rail power shovel with the highest level of safety in the industry

  • 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.
  • Capable of working with a large bucket (0.3 m3).
  • 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 for track work to enable installation of special attachments.
  • Attachments can be replaced quickly from the cockpit.
  • 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 (1,435 mm) and narrow gauge (1,067 mm)
    * Changeable to other gauges.
  • Equipped with a mobile crane to perform lifting work
    * Only MPS78UU-6.
  • All models are provided with back monitors.
Road-rail power shovel

Road-rail power shovel

Moving image
Examples of work
Major dimensions (MPS78UU-6)
Major dimensions
Principal specifications
Item MPS78UU-6 MPS75UU-3
Base vehicle Komatsu PC78UU-6 Komatsu PC75UU-3
Total working weight (kg) 110,000
Type of track roller Rubber integral insulated shoe
Fuel tank (L) 125 80
Overall length (during transportation) (mm) 6,204 6,135
Overall width (mm) 2,330 2,320
Overall height (on track) (mm) 2,883 2,855
Swing radius (mm) 1,300 1,300
Overall length of crawler (mm) 2,690 2,867
Bucket capacity range (m3) 0.09~0.3
Bucket offset (mm) Left 1,030 Right 1,065 Left 1,075 Right 1,020
Max. digging depth (mm) 4,200 4,200
Max. digging radius (mm) 6,400 6,360
Max. digging height (mm) 7,360 7,160
Max. dumping height (mm) 5,290 5,150
Min. swing radius (mm) 1,240 1,150
Max. digging power (kN) 61.3 50.1
Max. speed of crawler (km/h) Low speed: 3.0 High speed: 4.5 Low speed: 2.8 High speed: 4.0
Gradability (degrees) 35 35
Ground contact pressure (kgf/cm2) 0.50 0.50
Track running performance
Max. speed (km/h) 30
Max. gradient at which vehicle can start 35/1,000
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
Rated crane load MPS78UU-6
Working radius (m) Rated load (t)
1.78~2.5 1.70
3.0 1.62
3.5 1.53
4.0 1.23
4.5 1.02
5.0 0.86
5.44 0.78
Major units
Item MPS78UU-6 MPS75UU-3
Model Komatsu 4D95LE-2 Komatsu 4D102-1
Type 4-cycle water-cooled inline direct injection type
Total displacement (cc) 3,260 3,920
Rated output (PS/rpm) 55/1,750
Hydraulic unit
Type and quantity of hydraulic pumps Variable capacity piston type, 1 pc.
+ gear type, 2 pcs.
Tandem piston type
+ gear type, 1 pc.
Hydraulic pump discharge (L/min) 80×2+60+12.7 155+52
Max. set pressure (kgf/cm2) 270 260
Type and quantity of control valves 10-spool valve: 1 pc. 9-spool valve: 1 pc.
Operation method Hydraulic assist Hydraulic assist
Crawler running motor Variable capacity piston type Piston type, 2 pcs.
Crane unit
Type Articulated jib mobile crane with hydraulic shovel -
Rated lifting load (t) 1.7 -
Crane safety devices

Overload prevention device, pressure rise prevention valve, sudden drop prevention valve, overload alarm, outer locking hook, level board and external signal lamp

Track running equipment
Wheel Diameter: 460 mm Width: 125 mm. wheel back to back gauge: 990 mm (narrow gauge), 1360 mm (standard gauge) 4 insulated wheels
Axle 2 axles (diameter 100 mm), 1 axle drive Distance between axles: 2620 mm
Motive power source Hydraulic motor with counterbalance valve (output 48 kW, torque 765 N.m), 2 units
Drive Chain driving system for each axle

Hydraulic disc brake for each axle (braking torque: 0.5 t.m) + counterbalance valve for each axle, with parking braking system and escape lash prevention device

Rail clamp 4 pairs at front and rear for keeping body during working, hydraulically actuated
Each clamp provided with insulating material Clamping force: 2.3 t
Safety devices in track
Emergency engine Air-cooled 4-cycle single cylinder diesel engine (406 cc, 10 ps)
Boom height limits 3.8 m: Yellow lamp ON 4.2 m: Red lamp ON + automatic stop of boom
Boom insulation High voltage plastic sheet for electrical use (withstand voltage: 7000 V)
Device for preventing interference with adjacent lines Key switch type. In setting: Red lamp ON + warning sound + automatic stop of swing
Other safety devices Hydraulic motor release clutch, hydraulic motor free valve, train proximity alert system, front and rear lamps, flasher, fence for crew, connecting hole, coupling rod and back monitor
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