10
11
WORKING RANGE
DIMENSIONS
BACKHOE BUCKET AND ARM COMBINATION
S
PECIFICATIONS
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 m
3
0.08 m
3
350 mm
450 mm
145 kg
3
0.12 yd
3
0.10 yd
3
14"
18"
320 lb
0.12 m
3
0.11 m
3
450 mm
550 mm
160 kg
3
0.16 yd
3
0.14 yd
3
18"
22"
355 lb
0.20 m
3
0.18 m
3
550 mm
650 mm
185 kg
3
0.26 yd
3
0.24 yd
3
22"
26"
410 lb
0.28 m
3
0.25 m
3
650 mm
750 mm
210 kg
4
X
0.37 yd
3
0.33 yd
3
26"
30"
465 lb
0.34 m
3
0.30 m
3
755 mm
210 kg
4
□
X
0.45 yd
3
0.39 yd
3
29.7"
NA
465 lb
—General digging
—Light-duty operation
X— Not available
Shoes
Operating Weight
Ground Pressure
mm
in
kg
lb
kPa
kg/cm
2
psi
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 in
3
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/cm
2
3,840 psi
Swing circuit. . . . . . . . . . . . . . .
20.6 MPa
210 kgf/cm
2
2,990 psi
Blade circuit (Raise) . . . . . . . . .
12.7 MPa
130 kgf/cm
2
1,850 psi
(Lower) . . . . . . . .
21.1 MPa
215 kgf/cm
2
3,060 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 m
3
0.37 yd
3
backhoe 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"
A
Overall length
5770 mm
18'11"
6295 mm
20'8"
B
Overall height (to top of boom)*
2555 mm
8'5"
2870 mm
9'5"
C
Overall width
2330 mm
7'8"
D
Overall height (to top of cab)*
2730 mm
8'11"
E
Ground clearance, counterweight
735 mm
2'5"
F
Minimum ground clearance
360 mm
1'2"
G
Tail swing radius
1240 mm
4'1"
H
Length of track on ground
2235 mm
7'4"
I
Track length
2840 mm
9'4"
J
Track gauge
1870 mm
6'2"
K
Width of crawler
2320 mm
7'7"
L
Shoe width
450 mm
17.7"
M
Grouser height
20 mm
0.8"
N
Machine cab height
1835 mm
6'0"
O
Machine cab width
2330 mm
7'8"
P
Distance 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"
A
Maximum digging height
7300 mm
23'11"
7600 mm
24'11"
B
Maximum dumping height
5180 mm
17'0"
5500 mm
18'1"
C
Maximum digging depth
4100 mm
13'5"
4710 mm
15'5"
D
Maximum vertical wall digging depth
3610 mm
11'10"
4030 mm
13'3"
E
Maximum digging depth of cut for
2440 mm
8' level
3770 mm
12'4"
4430 mm
14'6"
F
Maximum digging reach
6380 mm
20'11"
6920 mm
22'8"
G
Maximum digging reach at ground
6240 mm
20'6"
6790 mm
22'3"
H
Minimum digging reach at ground
1900 mm
6'3"
1735 mm
5'8"
I
Minimum 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
8
7
6
5
4
1
0
5
4
3
2
1
7
8
(m)
6
5
4
3
2
1
0
(m)
3
2
G.L
I
D
G
2440(8’)
F
E
C
A
B
245
9.6"
380
1’3"
H
STANDARD EQUIPMENT
●
Air cleaner, double element with auto dust
evacuator
●
Alternator, 35Ampere, 24V
●
Automatic air conditioner
●
Auto deceleration
●
Batteries, 55Ah/2 x 12V
●
Cab which includes: floor mat, intermittent
front windshield wiper and washer, large
ceiling hatch, pull-up front window, remov-
able lower windshield
●
Cooling fan, suction type
●
Monitor panel
●
Rear view mirrors (LH, rear)
●
Seat belt
50mm
2"
●
Shoes,
—
450mm
17.7" Triple grouser
●
Starting motor 4.5kW
●
Suspension seat
●
Travel alarm
●
Working lights
—1 on cab
—1 on boom
COMPACT HYDRAULIC EXCAVATOR
PC78US
-8
C
O M P A C T
H
Y D R A U L I C
E
X C A V A T O R
G.L
J
F
B*
A
P
E
N
M
D*
H
I
G
L
K
C(O)
1170
3’10"
1
3
9
5
4
’7
"
470
1’7"
2320
7’7"
120
4.7"
OPTIONAL EQUIPMENT
●
Additional counter weight
—
220 kg
485 lb
●
Additional working light on cab
●
Arm,
—
1650mm
5'5" arm assembly
●
Blade
●
Boom,
—
3710mm
12'2"
●
Hydraulic control unit
—1 additional actuator
●
Long arm,
—
2250mm
7'5" arm assembly
●
Reinforced blade with BOC
●
Seat belt
78mm
3"
●
Shoes,
—
450mm
17.7" Road Liner
—
600mm
23.6" Triple grouser
—
450mm
17.7" Rubber shoe
*
: Including grouser height
