DRIVES AND 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. . . . . . . . . . . . . 559 kN 57000 kg 125,660 lb
Gradeability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70%
Maximum travel speed
Low. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8 km/h 1.7 mph
High . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 km/h 2.6 mph
Service brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic lock
Parking brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil disc brake
UNDERCARRIAGE
Center frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H-leg frame
Track frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Box-section
Seal of track. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sealed
Track adjuster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic
No. of shoes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 each side
No. of carrier rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 each side
No. of track rollers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 each side
COOLANT AND LUBRICANT
CAPACITY (REFILLING)
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . . . 980 ltr 258.9 U.S. gal
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 ltr 26.4 U.S. gal
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 ltr 15.3 U.S. gal
Final drive, each side . . . . . . . . . . . . . . . . . . . 20 ltr 5.3 U.S. gal
Swing drive . . . . . . . . . . . . . . . . . . . . . . 24.5 x 2 ltr 6.5 x 2 U.S. gal
Hydraulic tank . . . . . . . . . . . . . . . . . . . . . . . 440 ltr 116.2 U.S. gal
OPERATING WEIGHT (APPROXIMATE)
PC850-8: Operating weight, including 8040 mm 26'5" boom, 3600
mm 11'10" arm, SAE heaped 3.4 m
3
4.45 yd
3
backhoe bucket,
operator, lubricant, coolant, full fuel tank, and the standard equipment.
PC850SE-8: Operating weight, including 7100 mm 23'4" boom, 2945
mm 9'8" arm, SAE heaped 4.3 m
3
5.62 yd
3
backhoe bucket, operator,
lubricant, coolant, full fuel tank, and the standard equipment.
12
13
SPECIFICATIONS
HYDRAULIC EXCAVATOR
PC850-80
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SAA6D140E-5
Type . . . . . . . . . . . . . . . . . . . . 4-cycle, water-cooled, direct injection
Aspiration . . . . . . . . . . . . . . Turbocharged, aftercooled, cooled EGR
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 mm 5.51"
Stroke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 mm 6.50"
Piston displacement . . . . . . . . . . . . . . . . . . . . . . . . . 15.24 ltr 930 in
3
Governor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . All-speed, electronic
Horsepower:
SAE J1995 . . . . . . . . . . . . . . . . . . . . . . . . Gross 370 kW 496 HP
ISO 9249 / SAE J1349* . . . . . . . . . . . . . . . . . Net 363 kW 487 HP
Rated rpm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1800 rpm
Fan drive type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic
Meets EPA Tier 3 and EU Stage 3A emission regulations.
*Net horsepower at the maximum speed of radiator cooling fan is 338 kW 453HP.
HYDRAULIC 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 . . . . . . . . . . . . 2 x 494 ltr/min 2 x 130.5 U.S. gpm
Fan drive pump . . . . . . . . . . . . . . . . . . Variable capacity piston type
Fan drive pump . . . . . . . . . . . . . . . . . . Variable capacity piston type
Hydraulic motors:
Travel. . . . . . . . . . . . . . . 2 x axial piston motor with parking brake
Swing . . . . . . . . . . 2 x axial piston motor with swing holding brake
Relief valve setting:
Implement circuits . . . . . . . . . . . 31.4 MPa 320 kg/cm
2
4,550 psi
Travel circuit . . . . . . . . . . . . . . . 34.3 MPa 350 kg/cm
2
4,980 psi
Swing circuit . . . . . . . . . . . . . . . 28.4 MPa 290 kg/cm
2
4,120 psi
Heavy lift circuit . . . . . . . . . . . . . 34.3 MPa 350 kg/cm
2
4,980 psi
Pilot circuit . . . . . . . . . . . . . . . . . . 2.9 MPa 30 kg/cm
2
430 psi
Hydraulic cylinders:
Number of cylinders—bore x stroke
Boom. . . . . . . . . . . . . . . . 2 – 200 mm x 1950 mm 7.9" x 76.8"
Arm. . . . . . . . . . . . . . . . . 2 – 185 mm x 1610 mm 7.3" x 63.4"
Bucket
Std . . . . . . . . . . . . . . . . 1 – 185 mm x 1820 mm 7.3" x 71.7"
SE. . . . . . . . . . . . . . . . . 1 – 225 mm x 1420 mm 8.9" x 55.9"
SWING SYSTEM
Driven method . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic motors
Swing reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Planetary gear
Swing circle lubrication . . . . . . . . . . . . . . . . . . . . . . . Grease-bathed
Swing lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil disc brake
Swing speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.8 rpm
PC850-8 PC850SE-8
Operating Ground Operating Ground
Shoes Weight Pressure Weight Pressure
610 mm 78700 kg
128 kPa
78300 kg
127 kPa
1.31 kgf/cm
2
1.30 kgf/cm
2
24" 173,500 lb
18.6 psi
172,620 lb
18.5 psi
710 mm 79500 kg
112 kPa
79100 kg
111 kPa
1.14 kgf/cm
2
1.13 kgf/cm
2
28" 175,270 lb
16.2 psi
174,380 lb
16.1 psi
WORKING RANGE
BACKHOE DIMENSIONS
BACKHOE BUCKET, ARM, AND BOOM COMBINATION
Unit: mm ft in
These charts are based on over-side stability with fully loaded bucket at maximum reach.
: General purpose use, density up to 1.8 t/m
3
3,000 lb/yd
3
: General purpose use, density up to 1.5 t/m
3
2,500 lb/yd
3
— : Not useable
PC850-8 PC850SE-8
Boom length 8040 mm 26'5" 7100 mm 23'4"
Arm length 3600 mm 11'10" 2945 mm 9'8" 3600 mm 11'10"
A Max. digging height 11955 mm 39'3" 11330 mm 37'2" 11055 mm 36'3"
B Max. dumping height 8235 mm 27'0" 7525 mm 24'8" 7430 mm 24'5"
C Max. digging depth 8445 mm 27'8" 7130 mm 23'5" 7790 mm 25'7"
D Max. vertical wall
digging depth
5230 mm 17'2" 4080 mm 13'5" 4260 mm 14'0"
E Max. digging depth
of cut for 8' level
8310 mm 27'3" 6980 mm 22'11" 7680 mm 25'2"
F Max. digging reach 13660 mm 44'10" 12265 mm 40'3" 12710 mm 41'8"
G Max. digging reach
at ground level
13400 mm 44'0" 11945 mm 39'2" 12400 mm 40'8"
H Min. swing radius 5985 mm 19'8" 5645 mm 18'6" 5440 mm 17'10"
Bucket digging force (SAE)
316 kN 391 kN 316 kN
32200 kgf / 70,990 lb 39900 kgf / 87,960 lb 32200 kgf / 70,990 lb
Arm crowd force (SAE)
285 kN 331 kN 285 kN
29100 kgf / 64,150 lb 33800 kgf / 74,520 lb 29100 kgf / 64,150 lb
Bucket digging force (ISO)
363 kN 431 kN 363 kN
37000 kgf / 81,570 lb 43900 kgf / 96,780 lb 37000 kgf / 81,570 lb
Arm crowd force (ISO)
298 kN 341 kN 298 kN
30400 kgf / 67,020 lb 34800 kgf / 76,720 lb 30400 kgf / 67,020 lb
PC850-8 PC850SE-8
8.04 m 26'5" boom 7.1 m 23'4" boom
3.6 m 11'10" arm 2.9 m 9'8" arm
A Overall Height 4850 mm 15'11" 4615 mm 15'2"
B Overall Length 13995 mm 45'11" 13130 mm 43'1"
BUCKET CAPACITY (HEAPED) WIDTH
Without side With side WEIGHT
SAE, PCSA CECE shrouds shrouds (with side shrouds) ARM LENGTH
m
3
yd
3
m
3
yd
3
mm in mm in kg lb m ft in
PC850-8 (use with 8.04 m boom) 3.6 11'10"
3.4 4.45 3.0 3.92 1820 71.7" 1870 73.6" 3500 7,720
PC850SE-8 (use with 7.1 m boom) 2.9 9'8" 3.6 11'10"
4.0 5.23 3.5 4.58 2000 78.7" 2105 82.9" 4000 8,820
4.0 5.23 3.5 4.58 2000 78.7" 2105 82.9" 3435 7,570 —
4.3 5.62 3.8 4.97 2150 84.6" 2255 88.8" 3870 8,530 —
4.5 5.87 4.0 5.23 2230 87.8" 2330 91.9" 4050 8,930 —
H YDRAULIC E XCAVATOR
PC850-8
*For heavy duty
*
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