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Komatsu Excavators PC1250-8

Komatsu Excavators PC1250-8
PC1250-8 Hydraulic Excavator

The PC1250-8, equipped with a short boom and stick is a mass excavator that will make top loading mass amounts of over-burden a fast and efficient process. In addition, power, economy, heavy lift and swing priority work modes allow the operator to operate his machine in the most efficient manner for his current work. Two boom mode settings and shockless boom control make operation smoother and more productive.

Engine
EPA Tier 3 and EU stage 3A emission certified.
Model Komatsu SAA6D170E-5
Type 4-cycle, water-cooled, direct injection
Aspiration Turbocharged, aftercooled, cooled EGR
Number of cylinders 6
Bore 6.69" 170 mm
Stroke 6.69" 170 mm
Piston displacement 1,413 in³ 23.15 ltr
Governor All-speed, electronic
Horsepower:
SAE J1995 (Gross) 688 HP 514 kW
ISO 9249 / SAE J1349 - Net 672 HP 502 kW
Hydraulic fan at maximum speed (Net) 620 HP 463 kW
Rated rpm 1800 rpm
Fan drive type Hydraulic, variable speed, reversible
EPA Tier 3 and EU stage 3A emission certified.
Hydraulics System
Type Open-center load sensing system
Number of selectable working modes 2
Main pump:
Type Variable capacity piston pumps
Pumps for Boom, arm, bucket, swing, and travel circuits
Maximum flow
For implement and travel 2 x 130.5 U.S. gpm 2 x 494 ltr/min
For swing 1 x 158.5 U.S. gpm 1 x 600 ltr/min
Sub-pump for control circuit Gear pump
Hydraulic motors:
Travel 2 x axial piston motors with parking brake
Swing 2 x axial piston motors with swing holding brake
Relief valve setting:
Implement circuits 4,550 psi 31.4 MPa 320 kg/cm²
Travel circuit 4,980 psi 34.3 MPa 350 kg/cm²
Swing circuit 3,910 psi 27.0 MPa 275 kg/cm²
Pilot circuit 430 psi 2.9 MPa 30 kg/cm²
Hydraulic cylinders:
Cylinder / Number of cylinders Bore x Stroke Bore x Stroke
Backhoe
Boom / 2 8.9" x 94.1" 225 mm x 2390 mm
Arm / 1 9.8" x 95.9" 250 mm x 2435 mm
Bucket:
Std / 2 6.3" x 71.8" 160 mm x 1825 mm
SP / 2 6.3" x 76.8" 160 mm x 1950 mm
Swing System
Driven method 2 x Hydraulic motor
Swing reduction Planetary gear
Swing circle lubrication Grease-bathed
Swing lock Oil disc brake
Swing speed 5.5 rpm
Drives & Brakes
Steering control Two levers with pedals
Drive method Fully hydrostatic
Travel motor Axial piston motor, in-shoe design
Reduction system Planetary double reduction
Maximum drawbar pull 154,320 lb 686 kN 70000 kg
Gradeability 70%
Maximum travel speed:
High 2.0 mph 3.2 km/h
Low 1.3 mph 2.1 km/h
Service brake Hydraulic lock
Undercarriage
Center frame H-leg frame
Track frame Box-section
Track type Sealed
Track adjuster Hydraulic
No. of shoes:
Standard, SP, Shovel 48 each side
LC 55 each side
No. of carrier rollers 3 each side
No. of track rollers:
Standard, SP, Shovel 8 each side
LC 10 each side
Coolant and Lubricant Capacity (refilling)
Fuel tank 359.3 US gal 1360 ltr
Radiator 37.5 US gal 142 ltr
Engine 22.7 US gal 86 ltr
Final drive, each side 5.5 US gal 21 ltr
Swing drive 2 x 6.4 US gal 2 x 24.5 ltr
Hydraulic tank 177.0 US gal 670 ltr
PTO 3.6 US gal 13.5 ltr

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