Hydraulic Excavator

PC78US-10

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  • 17,747 lbs Operating Weight
  • 65.5 @ 1950 rpm Horsepower
  • 0.12 - 0.44 yd³ Bucket Capacity
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PC78US-10

Standard value added features provide operators with flexible jobsite performance.

New engine and hydraulic technology improves productivity by up to 3% and lowers fuel consumption by up to 5%.

PC78US-10 Walkaround

Features

Increased productivity

The improved vehicle control contributes to increased productivity while maintaining low fuel consumption.

Productivity
up to 3% increase

(Compared to the PC78US-8)

Maximum drawbar pull

up to 2% increase

(Compared to the PC78US-8)

Equipped with a Blade as Standard Equipment

A blade for efficient back-filling and leveling work is equipped as standard. The dedicated pump for the blade enables smooth dozing operation.

True Tight Tail Swing For Confined Areas

Short implement swing radius
12' 2" (3710 mm) boom raising angle of the PC78US-10 is larger than a conventional profile excavator. The result is reduced front implement swing radius.

Tight tail swing radius
4' 7" 1390 mm short tail swing radius of the PC78US-10 allows the machine to work in more confined areas than a conventional machine.

Round Profile of both Front and Rear Portion of the Upper Structure
Komatsu tighttail hydraulic excavators allows the machine to work in surprisingly tight quarters. 

100% "passive regeneration"

The new Komatsu Diesel Oxidation Catalyst (KDOC) has an integrated design that does not interfere with daily operation. This smart and simplified system removes soot using 100% "passive regeneration" without the need for a Diesel Particulate Filter. The KDOC is a simple design and does not have a scheduled service interval like a DPF and is designed for long life with no scheduled maintenance required. For owners, this means lower owning and operating costs due to less complexity and seamless operation.

Specifications

Engine

Model
Komatsu SAA4D95LE-6*
Type
Water cooled, 4-cycle, direct injection
Aspiration
Variable flow, turbocharged, air-to-air aftercooled EGR
Number of cylinders
4
Bore
 95 mm
3.74"
Stroke
 115 mm
 4.52"
Piston displacement 3.26 ltr 199 in³
Horsepower:    
SAE J1995 - Gross 50.7 kW 68 HP
ISO 9249 / SAE J1349 - Net 48.8 kW 65.5 HP
Rated rpm   1950
Governor    All-speed control, electronic
Lubrication system:  
Method   Gear pump, force-lubrication
Filter   Full-flow
Air cleaner   Air cleaner, double element and auto dust evacuator
*EPA Tier 4 Final emissions certified

Hydraulics

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

Number of selectable working modes: 6

Main pumps:

Pumps for   Boom, arm, bucket, and travel circuits
Type
Variable capacity piston type, axial piston
Maximum flow 160 ltr/min 42.2 u.s. gal/min
Pumps for   Swing and blade
Type
Fixed displacement gear
Maximum flow 63 ltr/min 16.64 u.s. gal/min
Hydraulic motors:

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

Implement, travel circuit 26.5 MPa / 270 kgf/cm² 3,844 psi
Travel circuit 27.0 MPa 275 kgf/cm2 3,916 psi
Swing circuit 21.1 MPa / 215 kgf/cm² 3,060 psi
Blade circuit (Raise) 12.7 MPa / 130 kgf/cm² 1,842 psi
Blade circuit (Lower) 20.0 MPa / 210 kgf/cm² 2,900 psi
Hydraulic cylinders:
(Number of cylinders – bore x stroke x rod diameter) 		   
Boom / 1 115 mm x 858 mm x 65 mm 4.53" x 33.8" x 2.56"
Arm / 1 100 mm x 861 mm x 60 mm 3.9" x 33.9" x 2.36"
Bucket / 1 90 mm x 710 mm x 55 mm 3.54" x 27.95" x 2.17"
Blade / 1 130 mm x 200 mm x 65 mm 5.12" x 7.87" x 2.56"

Drives & Brakes

Steering control Two levers with pedals
Drive method Fully hydrostatic
Maximum drawbar pull 68.2 kN 6950 kgf
15,489 lbf
Maximum travel speed:  
High 5 km/h
3.1 mph
Low 2.8 km/h
1.7 mph
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
Swing speed 10 rpm

Undercarriage

Center frame X-frame leg
Track frame Box-section
Track type Sealed
Track adjuster Hydraulic
Number of carrier shoes (each side) 39
Number of carrier rollers (each side) 1
Number of track rollers (each side) 5

Coolant & Lubricant Capacity (refilling)

Fuel tank 125 ltr 33.0 u.s. gal
Radiator 13 ltr 3.43 u.s. gal
Engine 11.5 ltr 3.04 u.s. gal
Final drive, each side 1.1 ltr 0.29 u.s. gal
Swing drive 2.0 ltr 0.53 u.s. gal
Hydraulic tank 56 ltr 14.8 u.s. gal

Operating Weight

Operating weight includes 3710 mm 12'2" one-piece boom, 2250 mm 7'5" arm, SAE heaped 0.2 m3 0.26 yd3 bucket, rated capacity of lubricants, coolant, full fuel tank, operator, and standard equipment.

With Blade
Track Shoes Operating weight Ground Pressure
450 mm 18" 7910 kg
17,439 lb		 34.9 kPa / 0.36 kg/cm2
5.06 psi
600 mm 24" 8080 kg
17,813 lb
26.7 kPa / 0.27 kg/cm2
3.87 psi
450 mm 18"
Road Liner		 8050 kg
17,747 lb
35.1 kPa / 0.36 kg/cm2
5.09 psi

standard

  • 2320 mm 7'8" blade
  • Alternator, 24 Ampere, 60V
  • AM/FM radio
  • Automatic engine warm-up system
  • Automatic air conditioner/heater
  • Auxiliary input (3.5mm jack)
  • Battery disconnect switch
  • Converter, (2) x 12V
  • Counterweight, 490 kg 1,080 lb
  • Dry type air cleaner, double element
  • Electric horn
  • EMMS monitoring system
  • Engine, Komatsu SAA4D95LE-6
  • Engine overheat prevention system
  • Extended work equipment grease interval
  • Fan guard structure
  • Fuel system pre-cleaner 10 micron
  • Hydraulic control unit, 1 actuator
  • Hydraulic track adjusters
  • KOMTRAX®
  • Large LCD color monitor, high resolution
  • Lock lever
  • Mirrors, (LH and RH)
  • Operator Protective Top Guard (OPG), Level 1
  • Pattern change valve (ISO to BH control)
  • PPC hydraulic control system
  • Pump/engine room partition cover
  • Radiator and oil cooler dustproof net
  • Rear reflectors
  • Rearview monitoring system (1 camera)
  • Revolving frame undercovers
  • ROPS cab
  • Seat belt, retractable, 76mm 3"
  • Seat belt indicator
  • Secondary engine shutoff switch
  • Service valve
  • Skylight
  • Slip resistant foot plates
  • Starter motor, 4.5kW
  • Suction fan
  • Thermal and fan guards
  • Travel alarm
  • Working lights, 2 cab/1 boom LH
  • Working mode selection system

optional

  • Arms – 2250 mm 7'5" arm assembly
  • Boom – 3710 mm 12'2" arm assembly
  • Shoes, road liner, 450 mm 18"
  • Shoes, triple grouser, 450 mm 18"
  • Shoes, triple grouser, 600 mm 24"
  • Shoes, rubber shoe, 600 mm 24"
  • Track roller guard
  • Blade assembly 2330 mm 7'8"
  • Wide blade 2470 mm 8'1" (requires 600 mm 24" shoes)