Komatsu HD405-7

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The 45 ton capacity HD405-7 features the same technology that puts large Komatsu haul trucks ahead of the pack. Seven speed, fully automatic K-Atomics transmission with lock-up, a hydro-pneumatic suspension system and oil cooled multi-disc brake retarder give the HD405-7 the outstanding performance expected from a Komatsu product.


EPA Tier 3 and EU Stage 3A emission certified.    
Model   KOMATSU SAA6D140E-5
Type   Water-cooled, 4-cycle
Aspiration   Turbo-charged and air-to-air after-cooled
Number of cylinders   6
Bore x stroke 5.5" x 6.5" 140 mm x 165 mm
Piston displacement 930 in3 15.24 ltr.
SAE J1995 518 HP 386 kW
ISO 9249 /SAE J1349 498 HP 371 kW
Rated rpm   2,000 rpm
Fan drive type.   Mechanical
Maximum torque. 1600 Ib•ft 221 kg•m
Fuel system   Direct injection
Governor   Electronically controlled
Lubrication system:    
Method   Gear pump, force-Iubric
Filter   Full-flow type
Air cleaner   Dry type with double elements and precleaner, plus dust indicator
Torque converter   3-elements, 1-stage, 2-phase
Transmission   Full-automatic, planetary type
Speed range   7 speeds forward and 1 reverse
Lockup clutch   Wet, single-disc clutch
Forward   Torque converter drive in 1st gear, direct drive in 1st lockup and all higher gear
Reverse   Torque converter drive
Shift control   Electronic shift control with automatic clutch modulation in all gear
Maximum travel speed 43.5 mph 70.0 km/h
Rear Axle Full-floating  
Final drive type Planetary gear  
Differential 3.125  
Planetary 4.737  
Suspension System    
Independent, hydropneumatic suspension cylinder with fixed throttle to dampen vibration.    
Effective cylinder stroke (front suspension) 9.8" 250 mm
Rear axle oscillation:    
Oil stopper   6.8°
Mechanical stopper   8.1°
Steering System    
Type   Fully hydraulic power steering with two double-acting cylinders
Supplementary steering   Manually controlled (meets ISO 5010, SAE J1511 and SAE J53)
Minimum turning radius 23'7" 7.2 m
Maximum steering angle (outside tire)   43°
Dimensions comply with ISO 3471 and SAE J1040-1988c ROPS (Roll-Over Protective Structure) standards.     
Main Frame    
Type Box-sectioned structure  
Brakes meet ISO J3450 and SAE J1473 standards.    
Service brakes:    
Front   Full-hydraulic control, caliper disc type
Rear   Full-hydraulic control, oil-cooled multiple-disc type
Parking brake   Spring applied, multiple-disc type
Retarder   Oil-cooled, multiple-disc 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 150 in2 968 cm2
Rear 7,881 in2 50847 cm2
Struck 26.2 yd3 20 m3
Heaped (2:1, SAE) 35.7 yd3 27.3 m3
Payload 45.2 U.S. tons 41.0 metric tons
Material (high tensile strength steel) 227,520 psi 160 kg/mm2
Structure   V-shape body
Material thickness:    
Bottom 0.98" 25 mm
Front 0.63" 16 mm
Sides 0.55" 14 mm
Target area: (inside length x width) 18'4" x 11'1" 5590 mm x 3380 mm
Dumping angle   48°
Height at full dump 26'0" 7925 mm
Heating   Exhaust heating
Hydraulic System    
Hoist cylinder   Twin, 2-stage telescopic type
Relief pressure 2,990 psi 210 kg/cm2 
20.6 MPa    
Hoist time   10 sec
Empty weight 75,840 lb 34400 kg
Gross vehicle weight with 41 metric ton 45.2 U.S. ton payload 164,200 lb 74480 kg
Max. gross vehicle weight Standard tire 165,520 lb 75080 kg
Not to exceed max. gross vehicle weight, including options, fuel    
Weight distribution:    
Front axle   50.70%
Rear axles   49.30%
Front axle   33%
Rear axles   67%
Standard tire 18.00 R33  
Service Refill Capacities    
Fuel tank 127.9 U.S. Gal 484 ltr.
Engine oil 13.2 U.S. Gal 50 ltr.
Torque converter, transmission and retarder cooling 23.8 U.S. Gal 90 ltr.
Differentials (total) 11.9 U.S. Gal 45 ltr.
Final drives (total) 7.9 U.S. G 30 ltr.
Hydraulic system 34.1 U.S. Gal 129 ltr.
Suspension (total) 11.7 U.S. Gal 44.2 ltr.