10 11
WORKING RANGE
DIMENSIONS
BACKHOE BUCKET AND ARM COMBINATION
SPECIFICATIONS
PC78US-8
Bucket Capacity (heaped)
Width Number Arm Length
SAE, PCSA
CECE
Without Side
With Side Weight 1650 mm 2250 mm
Cutters Cutters of Teeth 5'5" 7'5"
0.09 m30.08 m3350 mm 450 mm 145 kg 3
0.12 yd30.10 yd314" 18" 320 lb
0.12 m30.11 m3450 mm 550 mm 160 kg 3
0.16 yd30.14 yd318" 22" 355 lb
0.20 m30.18 m3550 mm 650 mm 185 kg 3
0.26 yd30.24 yd322" 26" 410 lb
0.28 m30.25 m3650 mm 750 mm 210 kg 4X
0.37 yd30.33 yd326" 30" 465 lb
0.34 m30.30 m3755 mm 210 kg 4□X
0.45 yd30.39 yd329.7" NA 465 lb
—General digging —Light-duty operation X— Not available
Shoes Operating Weight Ground Pressure
mm in kg lb kPa kg/cm2psi
With 450 17.7" 7365 16,240 33.0 0.34 4.83
blade 600 23.6" 7535 16,615 25.3 0.26 3.70
without 450 17.7" 6945 15,315 31.1 0.32 4.51
blade 600 23.6" 7115 15,690 23.9 0.24 3.47
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SAA4D95LE-5
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Water-cooled, 4-cycle
Aspiration . . . . . . . . . . . . . . Turbocharged, and air-to-air aftercooled
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Bore x stroke . . . . . . . . . . . . . . . . . . 95 mm x 115 mm 3.74" x 4.53"
Piston displacement. . . . . . . . . . . . . . . . . . . . . . . . . . 3.26 ltr 199 in3
Governor . . . . . . . . . . . . . . . . . . . . . . . . All-speed control, electronic
Horsepower
SAE J1995 . . . . . . . . . . . . . . . . . . . . . . . . . Gross 42.8 kW 57 HP
ISO 9249 / SAE J1349 . . . . . . . . . . . . . . . . . . . Net 41 kW 55 HP
Rated rpm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1950 rpm
Fuel system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Direct injection
Lubrication system
Method . . . . . . . . . . . . . . . . . . . . . . . Gear pump, force-lubrication
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Full-flow
Air cleaner . . . . . . . . . . . . . . . . . . . . . Dry-type with double elements
. . . . . . . . . . . . . . . . . and auto dust evacuator, plus dust indicator
EPA Interim Tier 4 and EU Stage 3A emissions certified
Starting motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 kW/24 V
Alternator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 A/24 V
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Ah/2 x 12 V
HYDRAULICS 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 . . . . . . . . . . . . . . . . 160 ltr/min 42.3 U.S. gal/min
Type (for machine with blade) . . . . . . . . . Fixed displacement gear
Maximum flow . . . . . . . . . . . . . . . . . 63 ltr/min 16.6 U.S. gal/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 . . . . . . 26.5 MPa 270 kgf/cm23,840 psi
Swing circuit. . . . . . . . . . . . . . . 20.6 MPa 210 kgf/cm22,990 psi
Blade circuit (Raise) . . . . . . . . . 12.7 MPa 130 kgf/cm21,850 psi
(Lower) . . . . . . . . 21.1 MPa 215 kgf/cm23,060 psi
Hydraulic cylinders:
(Number of cylinders – bore x stroke x rod diameter)
Boom . . . . . . . 1–115 mm x 858 mm x 65 mm 4.5" x 33.8" x 2.6"
Arm . . . . . . . . 1–100 mm x 861 mm x 60 mm 3.9" x 33.9" x 2.4"
Bucket . . . . . . 1– 90 mm x 710 mm x 55 mm 3.5" x 28.0" x 2.2"
Blade . . . . . . . 1–130 mm x 130 mm x 65 mm 5.1" x 5.1" x 2.6"
SWING SYSTEM
Driven by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic motor
Swing reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Planetary gear
Swing circle lubrication . . . . . . . . . . . . . . . . . . . . . . . Grease-bathed
Swing lock . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical disc brake
Swing speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 rpm
DRIVES AND BRAKES
Steering control . . . . . . . . . . . . . . . . . . . . . . . Two levers with pedals
Drive method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydrostatic
Maximum drawbar pull. . . . . . . . . . . . . . 66.9 kN 6820 kgf 15,050 lbf
Maximum travel speed: High . . . . . . . . . . . . . . . . . 5.0 km/h 3.1 mph
Low . . . . . . . . . . . . . . . . . 2.9 km/h 1.8 mph
Service brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic lock
Parking brake. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical disc
UNDERCARRIAGE
Center frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-frame
Track frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Box-section
Seal of track . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sealed track
Track adjuster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic
Number of shoes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 each side
Number of carrier rollers . . . . . . . . . . . . . . . . . . . . . . . . . 1 each side
Number of track rollers . . . . . . . . . . . . . . . . . . . . . . . . . . 5 each side
COOLANT AND LUBRICANT
CAPACITY (REFILLING)
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . 125 ltr 33.0 U.S. gal
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ltr 2.6 U.S. gal
Engine. . . . . . . . . . . . . . . . . . . . . 11.5 (11.0) ltr 3.0 (2.9) U.S. gal
Final drive, each side . . . . . . . . . . . . . . . 1.1 ltr 0.3 U.S. gal
Swing drive . . . . . . . . . . . . . . . . . . . . . . . 2.0 ltr 0.5 U.S. gal
Hydraulic tank . . . . . . . . . . . . . . . . . 100 (56) ltr 26.4 (14.8) U.S. gal
OPERATING WEIGHT (APPROXIMATE)
Operating weight including 3710 mm 12'2" one-piece boom,
1650 mm 5'5" arm, SAE heaped 0.28 m30.37 yd3backhoe bucket,
blade, rated capacity of lubricants, coolant, full fuel tank, operator,
and standard equipment.
Boom Length 3710 mm 12'2" 3710 mm 12'2"
Arm Length 1650 mm 5'5" 2250 mm 7'5"
AOverall length 5770 mm 18'11" 6295 mm 20'8"
BOverall height (to top of boom)* 2555 mm 8'5" 2870 mm 9'5"
COverall width 2330 mm 7'8"
DOverall height (to top of cab)* 2730 mm 8'11"
EGround clearance, counterweight 735 mm 2'5"
FMinimum ground clearance 360 mm 1'2"
GTail swing radius 1240 mm 4'1"
HLength of track on ground 2235 mm 7'4"
ITrack length 2840 mm 9'4"
JTrack gauge 1870 mm 6'2"
KWidth of crawler 2320 mm 7'7"
LShoe width 450 mm 17.7"
MGrouser height 20 mm 0.8"
NMachine cab height 1835 mm 6'0"
OMachine cab width 2330 mm 7'8"
PDistance swing center to rear end 1405 mm 4'7"
Boom Length
3710 mm 12'2" 3710 mm 12'2"
Arm
Length
1650 mm 5'5" 2250 mm 7'5"
AMaximum digging height 7300 mm 23'11" 7600 mm 24'11"
BMaximum dumping height 5180 mm 17'0" 5500 mm 18'1"
CMaximum digging depth 4100 mm 13'5" 4710 mm 15'5"
DMaximum vertical wall digging depth 3610 mm 11'10" 4030 mm 13'3"
EMaximum digging depth of cut for
2440 mm 8' level 3770 mm 12'4" 4430 mm 14'6"
FMaximum digging reach 6380 mm 20'11" 6920 mm 22'8"
GMaximum digging reach at ground 6240 mm 20'6" 6790 mm 22'3"
HMinimum digging reach at ground 1900 mm 6'3" 1735 mm 5'8"
IMinimum swing radius 1750 mm 5'9" 2050 mm 6'9"
ISO Bucket digging force 61.3 kN 61.3 kN
6250 kgf 13,780 lbf 6250 kgf 13,780 lbf
Arm crowd force 41.5 kN 34.5 kN
4230 kgf 9,330 lbf 3520 kgf 7,760 lbf
SAE Bucket digging force 53.3 kN 53.3 kN
5440 kgf 11,990 lbf 5440 kgf 11,990 lbf
Arm crowd force 38.1 kN 33.1 kN
3890 kgf 8,570 lbf 3380 kgf 7,450 lbf
