Komatsu HD325-7

Double tap to zoom



The HD325-7 is a 40 ton capacity workhorse. Very maneuverable, the MacPherson front suspension give the HD325-7 a turning radius tighter than other trucks in its class. With two working modes the operator can most effectively take advantage of the fully automatic seven speed transmission with lock-up feature. A hydropneumatic suspension gives the operator a comfortable ride while maintaining more material in the bed for more production.


Model   KOMATSU SAA6D140E-5
Type   Water-cooled, 4-cycle
Aspiration   Turbo-charged, air-to-air after-cooled, cooled EGR
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 1,600 lb•ft 221 kg•m
Fuel system   Direct injection
Governor   Electronically controlled
Lubrication system :    
Method   Gear pump, force-lubrication
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-disk clutch
Forward   Torque converter drive in 1st gear, direct drive in 1st lockup and all higher gears
Reverse   Torque converter drive
Shift control   Electronic shift control with automatic clutch modulation in all gears
Maximum travel speed 43.5 mph 70 km/h
Rear axle Full-floating  
Final drive 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 cylinder
Supplementary steering   Manual control (meets ISO 5010, SAE J1511 and SAE J53)
Auxiliary steering   SAE automatic
Minimum turning radius 23'7'' 7.2 m
Maximum steering angle   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 3450 and SAE 1473 standards    
Service brakes:    
Front   Full-hydraulic control, caliper disc type
Rear   full-hydraulic, 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 in 2 968 cm2
Rear 7,881 in 2 50847 cm2
Struck 23.5 yd3 18 m3
Heaped (2:1 ,SAE) 31.4 yd3 24 m3
Payload, maximum 40 U.S. tons 36.5 metric tons
rated 35 U.S. tons 32 metric tons
Material : (high-tensile-strength steel) 184,860 psi 130 kg/mm2
Structure   V-shape body
Material thickness:    
Bottom 0.75" 19 mm
Front 0.47" 12 mm
Sides 0.35" 9 mm
Target area (inside length x width) 18'1" x 11'1" 5500 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
Hoist time   10 sec
Empty weight 69,700 lb 31600 kg
Gross vehicle weight with 32 metric ton (35 U.S.ton) payload 140,390 lb 63680 kg
Max. gross vehicle weight:    
Standard tire 152,740 lb 69280 kg
Not to exceed max. gross vehicle weight, including options, fuel    
Weight distribution:    
Empty: Front axle   51.70%
Rear axle   48.30%
Loaded: Front axle   33%
Rear axle   67%
Standard Tires 18.00-33-32PR  
Service Refill Capacities    
Fuel tank 127.9 U.S. Gal 484 ltr.
Engine oil 13.2 U.S. Gal 50ltr
Torque converter, transmission and retarder cooling 23.8 U.S. Gal 90 ltr
Differential 11.9 U.S. Gal 45 ltr
Final drive (left and right) 7.9 U.S. 30 ltr
Hydraulic system 34.1 U.S. gal 129 ltr
Suspension (total) 11.7 U.S. gal 44.2 ltr