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Current number of specifications

Komatsu 730E-8 Rock Truck

Selected Dimensions

A. Overall Length449.5 ft in137000 mm
C. Overall Height223.4 ft in68100 mm
D. Wheelbase191.6 ft in58400 mm


Electric Drive
AlternatorGTA - 49
ControlAC Torque Control System
Motorised WheelsGEB35 Traction Motors
Maximum speed (km/h)​64.5
Electrical System
Alternator24 volt, 250 am
Lighting24 volt
Cranking motorsTwo/24 volt
Suspension System
Capacity Struck77 yd358.9 m3
Heaped (2:1, SAE)111 yd384.9 m3
StructureFlat floor configuration
Weight62102 lb28169 kg
Canopy sheet6 mm 0.24'' 690 MPa 100,000 psi tensile strength steel
Front sheet10 mm 0.39'' 1379 MPa 200,000 psi tensile strength steel
Side sheet8 mm 0.31'' 1379 MPa 200,000 psi tensile strength steel
Floor sheet16 mm 0.63'' Outer 19 mm 0.75'' Center 1379 MPa 200,000 psi tensile strength steel
Payload399997.9 lb181436 kg
Number of Cylinders16
Power Measured @1900 rpm
Displacement3051.2 cu in50 L
Fuel TypeDiesel
Weight13589.3 lb6164 kg
Horse Power: SAE J19951492 hp1112.6 kw
Horse Power: ISO 9249 / SAE J13491405 hp1047.7 kw
Operating cycle4-cycle
Service Brake Typeall-hydraulic actuated
Parking Brake TypeSpring-applied, hydraulically released, with speed application protection.​
FrontWheel speed disc. Three calipers on a 1213 mm / 47.75" O.D. disc
RearDual disc armature speed. Two 635 mm / 25" O.D. discs per side. One caliper per disc.
Emergency brakesAutomatically applied prior to hydraulic system pressure dropping below level required to meet secondary stopping requirements.
​Wheel brake locksSwitch-activated​
​Electric dynamic retarder (max.)2387kW Continuously rated high-density blown grids w/retard at engine idle and reverse propulsion.​
Fuel Tank831.1 gal3146 L
Cooling system116.5 gal441 L
Hydraulic system210 gal795 L
Crankcase58.9 gal223 L
Motor gear box10 gal38 L
Gross Weight724000.2 lb328401 kg
Empty Weight323997.9 lb146963 kg
Weight Distribution Front - empty50 %
Weight Distribution Rear - empty50 %
Weight Distribution Front - loaded34 %
Weight Distribution Rear - loaded66 %
Standard tire​37.00 R57
Hydraulic System
Hoist cylinderTwo 3-stage dual-acting outbound cylinders and internal cushion valve, over-centre damping
Relief pressureHoist-17237 kPa 2,500 psi, Steering and brake-27580 kPa 4,000 psi
Hoist timePower-up loaded: 19 sec; Power-down: 10.5sec; Float-down empty: 12 sec
Turning circle diameter (SAE)89 ft in27.1 m
Reservoir135 gal511 L
FiltrationIn-line replaceable elements
SuctionSingle, full flow, 100 mesh
Hoist and steeringDual, in-line, high pressure
Pumps.Two pumps, single package, end of alternator
Turning Radius446.2 ft in136000 mm
Overall Length449.5 ft in137000 mm
Overall Height223.4 ft in68100 mm
Wheelbase191.6 ft in58400 mm
Width Over Tires-Front22.3 ft in6800 mm
Width Over Tires-Rear23.5 ft in7150 mm