KOMATSU HD785-7 mining truck
KOMATSU HD785-7 mining truck
Productivity and Economy Features
• High performance Komatsu SAA12V140E-3 engine Net horsepower 879 kW 1,178 HP
• Mode selection system with Variable HorsePower Control (VHPC)
• Two-speed selective reverse gears, RH and RL
• Anti-pitching 4-wheel oil-cooled multiple-disc retarder (AP-FOUR) Retarder absorbing capacity 1092 kW 1,464 HP (continuous descent)
• Automatic Retard Speed Control (ARSC) standard
Harmony with Environment
• Komatsu SAA12V140E-3 engine meets EPA Tier 4 interim emissions regulations
• Lead-free radiator
• Low operation noise
• Low fuel consumption
Reliability Features
• Flat face-to-face O-ring seals
• Sealed DT connectors
Operator Environment and Control
• Spacious cab with excellent visibility
• Ergonomically-designed cab
• Easy-to-see instrument panel
• Synchronous control of engine and transmission
• Advanced K-ATOMiCS with “Skip-shift” function
• Viscous cab mounts
• Electric body dump control
• Built-in ROPS/FOPS, Level 2 cab
• Parking brakes on 4-wheels
• Supplementary steering
• Pedal-operated secondary brake
• Three-mode automatic hydropneumatic suspension (optional)
Easy Maintenance
• Oil-cooled multiple-disc brakes and fully hydraulic-controlled braking system
• Extended oil change interval
• Disc wheels (flange type rims)
• Electric circuit breakers
• KOMTRAX Plus
Engine| Model | | Komatsu SAA12V140E-3 |
| Type | | Water-cooled, 4-cycle |
| Aspiration | | Turbo-charged, after-cooled |
| Number of cylinders | | 12 |
| Bore x Stroke | 5.51" x 6.50" | 140 mm x 165 mm |
| Piston displacement | 1,860 in³ | 30.48 ltr |
| Horsepower | | |
| SAE J1995 | Gross 1,200 HP | Gross 895 kW |
| ISO 9249 / SAE J1349 | Net 1,178 HP | Net 879 kW |
| Rated rpm | | 1,900 rpm |
| Fan drive type. | | Mechanical |
| Maximum torque | 3,747 lb ft | 518 kg•m |
| Fuel system | | Direct injection |
| Governor | | Electronic control |
| Lubrication system | | |
| Method | | Gear pump, force-lubrication |
| Filter | | Full-flow type |
| Air cleaner | | Dry type with double elements and pre-cleaned, with dust indicator |
Transmission| Torque converter | | 3-elements, 1-stage, 2-phase |
| Transmission | | Full-automatic, planetary-shaft type |
| Speed range | | 7 speeds forward and 2 reverse (RH, RL) |
| Lockup clutch. | | Wet, multiple-disc clutch |
| Forward | | Torque converter drive in 1st gear, direct drive in 1st lockup and all higher gears |
| Reverse | | Torque converter drive, direct drive (lockup) |
| Shift control | | Electronic shift control with automatic clutch modulation in all gear |
| Maximum travel speed | 40.4 mph | 65 km/h |
Axles| Rear axles | | Full-floating |
| Final drive type | | Planetary gear |
| Ratios: | | |
| Differential | | 3.357 |
| Planetary | | 6.333 |
Suspension System| Effective cylinder stroke: | | |
| Front suspension | 12.6" | 320 mm |
| Rear suspension | 5.0" | 127 mm |
| Rear axle oscillation | | 6.5° |
Steering System| Type | | Fully hydraulic power steering with two double-acting cylinders |
| Supplementary steering | | Electro-hydraulic motor |
| Minimum turning radius | 33'2" | 10.1 m |
| Maximum steering angle | | 41° |
Cab| Type | | Box-sectioned structure Integral front bumper |
Main Frame| Type | | Box-sectioned structure Integral front bumper |
Brakes| Service brakes: | | |
| Front | | Fully hydraulic control, oil-cooled multiple-disc type |
| Rear | | Fully hydraulic control, oil-cooled multiple-disc type |
| Parking brake | | Spring applied, multiple-disc type(actuates on all wheels) |
| Retarder | | Oil-cooled, multiple-disc front and rear brakes act as retarder |
| Secondary brake | | Manual pedal operation. When hydraulic pressure drops below the rated level, parking brake is automatically actuated. |
| Brake surface | | |
| Front | 5,807 in² | 37467 cm² |
| Rear | 11,224 in² | 72414 cm² |
Body| Capacity | | |
| Struck | 52.3 yd³ | 40 m³ |
| Heaped (2:1, SAE) | 78.5 yd³ | 60 m³ |
| Payload | 100.3 U.S. tons | 91.0 metric tons |
| Material | | 400 Brinell hardness high tensile strength steel |
| Structure | | V-shape body with V-bottom |
| Material thickness: | | |
| Bottom | 0.75" | 19 mm |
| Front | 0.47" | 12 mm |
| Sides | 0.35" | 9 mm |
| Target area (inside length x width) | 23'2"x 17'1" | 7065 mm x 5200 mm |
| Dumping angle | | 48° |
| Height at full dump | 33'1" | 10080 mm |
| Heating | | Exhaust heating |
Hydraulic System| Hoist cylinder | | Twin, 2-stage telescopic type |
| Relief pressure | 2,990 psi | 20.6 MPa / 210 kg/cm² |
| Hoist time | | |
| Raise | | 13 sec |
| Lower | | 14 sec |
Weight (approximate)| Empty weight | 158,800 lb | 72000 kg |
| Max. gross vehicle weight | 366,000 lb | 166000 kg |
| Not to exceed max. gross vehicle weight, including options, fuel and payload. | | |
| Weight distribution (Empty): | | |
| Front axle | | 47% |
| Rear axle | | 53% |
| Weight distribution (Loaded): | | |
| Front axle | | 31.5% |
| Rear axle | | 68.5% |
Tires| Standard tire | | 27.00 R49 |
Service Refill Capacities| Fuel tank | 345.6 U.S. Gal | 1308 ltr. |
| Engine oil | 34.1 U.S. Gal | 129 ltr. |
| Torque converter, transmission and retarder cooling | 54.2 U.S. Gal | 205 ltr. |
| Differentials | 36.2 U.S. Gal | 137 ltr. |
| Final drives (total) | 33.8 U.S. Gal | 128 ltr. |
| Hydraulic system | 46.2 U.S. Gal | 175 ltr. |
| Brake control | 9.5 U.S. Gal | 36 ltr. |
| Suspension (total) | 24.6 U.S. Gal | 93 ltr. |
| Engine coolant | 74.8 U.S. Gal | 283 ltr |
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