Komatsu PC78US-8

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Features

Performance and Versatility
• Standard auxiliary hydraulics
• Five working modes: Power, Economy, Lifting, Attachment, Breaker
• Three track options: rubber, steel, roadliner
• Automatic two-speed travel
• ISO/SAE pattern change valve

Service and Maintenance
• Wide-opening engine hood and side covers
• Side-by-side radiator and oil cooler are easily inspected
• Extended lubrication intervals
• Ground level maintenance
• Easy access to engine oil filter, engine main fuel filter, and fuel drain valve

KOMTRAX® equipped machines can send location, SMR and operation maps to a secure website utilizing wireless technology. Machines also relay error codes, cautions, maintenance items, fuel levels, and much more.

Operator Comfort
• Large cab with air conditioner
• Fully adjustable suspension seat with retractable seat belt
• Pilot proportional joystick controls are low effort
• Easy-to-see 7" multi-function color monitor
• Low-noise cab

Value, Durability, and Strength
• KOMTRAX® wireless equipment monitoring system
• High strength X-track frame
• Castings are used for boom foot and tip
• O-ring face seal hydraulic fittings
• Moisture/dust resistant electrical connectors

Peace of Mind
• Spacious cab with excellent visibility
• Neutral engine start system
• Thermal and fan guards
• Low emission Komatsu engine with dual element air cleaner
• One key operates the ignition and all machine locks

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 displacement 199 in³ 3.26 ltr
Horsepower - Net (ISO 9249/SAE J1349) @ 1950 rpm 55 HP 41 kW
*EPA Interim Tier 4 and EU Stage 3A certified.    
     
Electrical System    
Operating voltage 24 V  
Battery 55 Ah/2 x 12  
Alternator 35 A  
Starte 4.5 kW  
     
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 flow 42.3 u.s. gal/min 160 ltr/min
Type   Fixed displacement gear
Maximum flow 16.6 u.s. gal/min 63 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 circuit 3,840 psi 26.5 MPa / 270 kgf/cm²
Swing circuit 2,990 psi 20.6 MPa / 210 kgf/cm²
Blade circuit (Raise) 1,850 psi 12.7 MPa / 130 kgf/cm²
Blade circuit (Lower) 3,060 psi 21.1 MPa / 215 kgf/cm²
     
Performance    
Travel speed:    
High 3.1 mph 5.0 km/hr
Low 1.8 mph 2.9 km/hr
Swing speed   10 rpm
Ground pressure 4.83 psi 0.34 kg/cm²
Max. drawbar pull 15,050 lbf 66.9 kN / 6820 kgf
Gradeability   35°
Bucket digging force (ISO) 13,780 lb 6250 kg
Arm crowd force (ISO) 7,760 lb 3520 kg
     
Swing System    
Driven by Hydraulic motor  
Swing reduction Planetary gear  
Swing circle lubrication Grease-bathed  
Swing lock Mechanical disc brake  
     
Drives & Brakes    
Steering control Two levers with pedals  
Drive method Fully hydrostatic  
Service brake Hydraulic lock  
Parking brake Mechanical disc  
     
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  
     
Refill Capacities    
Fuel tank 33.0 u.s. gal 125 ltr
Radiator 2.6 u.s. gal 10 ltr
Engine 2.9 u.s. gal 11.0 ltr
Final drive, each side 0.3 u.s. gal 1.1 ltr
Swing drive 0.5 u.s. gal 2.0 ltr
Hydraulic tank 14.8 u.s. gal 56 ltr
     
Operating Weight    
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 weight 16,240 lb 7365 kg

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