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Komatsu Excavators PC78US-8

Komatsu Excavators PC78US-8
Specifications :
Engine
Model
Komatsu SAA4D95LE-5*
Type
Water cooled, 4-cycle, direct injection
Aspiration
Turbocharged, and air-to-air aftercooled
Number of cylinders
4
Piston displacement199 in³3.26 ltr
Horsepower - Net (ISO 9249/SAE J1349) @ 1950 rpm55 HP41 kW
*EPA Interim Tier 4 and EU Stage 3A certified.

Hydraulic System
Type: HydrauMind (Hydraulic Mechanical Intelligence New Design) system, Closed-center system with load-sensing valve and pressure-compensated valve
Main pumps:

Type
Variable displacement, axial piston
Maximum flow42.3 u.s. gal/min160 ltr/min
Type
Fixed displacement gear
Maximum flow16.6 u.s. gal/min63 ltr/min
Hydraulic motors:

Travel
2 x piston motor with parking brake
Swing
1 x piston motor with swing holding brake
Relief valve setting:

Implement, travel circuit3,840 psi26.5 MPa / 270 kgf/cm²
Swing circuit2,990 psi20.6 MPa / 210 kgf/cm²
Blade circuit (Raise)1,850 psi12.7 MPa / 130 kgf/cm²
Blade circuit (Lower)3,060 psi21.1 MPa / 215 kgf/cm²

Electric System
Operating voltage
24 V
Battery
55 Ah/2 x 12
Alternator
35 A
Starte
4.5 kW

Performance
Travel speed:

High3.1 mph5.0 km/hr
Low1.8 mph2.9 km/hr
Swing speed
10 rpm
Ground pressure4.83 psi0.34 kg/cm²
Max. drawbar pull15,050 lbf66.9 kN / 6820 kgf
Gradeability
35°
Bucket digging force (ISO)13,780 lb6250 kg
Arm crowd force (ISO)7,760 lb.3520 kg

Drives and Brakes
Steering control
Two levers with pedals
Drive method
Fully hydrostatic
Service brake
Hydraulic lock
Parking brake
Mechanical disc




Swing System

Driven by
Hydraulic motor
Swing reduction
Planetary gear
Swing circle lubrication
Grease-bathed
Swing lock
Mechanical disc brake

Undercarriage
Center frame
X-frame
Track frame
Box-section
Track type
Sealed track
Track adjuster
Hydraulic
Number of carrier rollers (each side)
1
Number of track rollers (each side)
5

Coolant and Lubricant Capity (refilling)
Fuel tank33.0 u.s. gal125 ltr
Radiator2.6 u.s. gal10 ltr
Engine2.9 u.s. gal11.0 ltr
Final drive, each side0.3 u.s. gal1.1 ltr
Swing drive0.5 u.s. gal2.0 ltr
Hydraulic tank14.8 u.s. gal56 ltr

Operating Weight (Aproximate)
Operating weight including 3710 mm / 12'2" one-piece boom, 2250 mm / 7'5" arm, SAE heaped 0.28 m³ / 0.37 yd³ backhoe bucket, cab, rubber shoe, blade, rated capacity of lubricants, coolant, full fuel tank, operator, and other standard equipment.
Operating weight16,240 lb7365 kg


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