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 . . . . . . . . . . . .
686 kN
70000 kgf 154,320 lb
Gradeability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70%
Maximum travel speed
Low. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 km/h
1.3 mph
High . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 km/h
2.0 mph
Service brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic lock
UNDERCARRIAGE
Center frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H-leg frame
Track frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Box-section
Seal of track. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sealed
Track adjuster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic
No. of shoes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 each side
No. of carrier rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 each side
No. of track rollers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 each side
COOLANT AND LUBRICANT
CAPACITY
(REFILLING)
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . .
1360 ltr
359.3 U.S. gal
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . . .
142 ltr
37.5 U.S. gal
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
86 ltr
22.7 U.S. gal
Final drive, each side . . . . . . . . . . . . . . . . . . .
21 ltr
5.5 U.S. gal
Swing drive . . . . . . . . . . . . . . . . . . . . . . .
20 x 2 ltr
5.3 x 2 U.S. gal
Hydraulic tank . . . . . . . . . . . . . . . . . . . . . . .
670 ltr
177.0 U.S. gal
PTO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.5 ltr
3.7 U.S. gal
OPERATING WEIGHT
(APPROXIMATE)
BACKHOE
PC1250-8: Operating weight, including
9100 mm
29'10" boom,
3400
mm
11'2" arm, SAE heaped
5.0 m
3
6.5 yd
3
backhoe bucket, operator,
lubricant, coolant, full fuel tank, and the standard equipment.
PC1250SP-8: Operating weight, including
7800 mm
25'7" boom,
3400 mm
11'2" arm, SAE heaped
6.7 m
3
8.8 yd
3
backhoe bucket, full
length roller guard, operator, lubricant, coolant, full fuel tank, and the
standard equipment.
12
13
S
PECIFICATIONS
HYDRAULIC EXCAVATOR
PC1250
-8
0
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SAA6D170E-5
Type . . . . . . . . . . . . . . . . . . . . 4-cycle, water-cooled, direct injection
Aspiration . . . . . . . . . . . . . . Turbocharged, aftercooled, cooled EGR
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
170 mm
6.69"
Stroke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
170 mm
6.69"
Piston displacement . . . . . . . . . . . . . . . . . . . . . . . .
23.15 ltr
1413 in
3
Governor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . All-speed, electronic
Horsepower:
SAE J1995 . . . . . . . . . . . . . . . . . . . . . . . . Gross
514 kW
688 HP
ISO 9249 / SAE J1349* . . . . . . . . . . . . . . . . . Net
502 kW
672 HP
Rated rpm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1800 rpm
Fan drive type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic
EPA Tier 3 and EU stage 3A emission certified.
*Net horsepower at the maximum speed of radiator cooling fan is 463 kW 620HP.
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:
For implement and travel. . .
2 x 494 ltr/min
2 x 130.5 U.S. gpm
For swing . . . . . . . . . . . . . .
1 x 600 ltr/min
1 x 158.5 U.S. gpm
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
Backhoe . . . . . . . . . . . . . . . . .
31.4 MPa
320 kgf/cm
2
4,550 psi
Loading shovel . . . . . . . . . . . .
31.4 MPa
320 kgf/cm
2
4,550 psi
Travel circuit . . . . . . . . . . . . . . .
34.3 MPa
350 kgf/cm
2
4,980 psi
Swing circuit . . . . . . . . . . . . . . .
27.5 MPa
280 kgf/cm
2
3,980 psi
Pilot circuit . . . . . . . . . . . . . . . . . .
2.9 MPa
30 kgf/cm
2
430 psi
Hydraulic cylinders:
Number of cylinders—bore x stroke
Backhoe
Boom. . . . . . . . . . . . . . . .
2 – 225 mm x 2390 mm
8.9" x 94.1"
Arm . . . . . . . . . . . . . . . . .
1 – 250 mm x 2435 mm
9.8" x 95.9"
Bucket
Std . . . . . . . . . . . . . . . . .
2 – 160 mm x 1825 mm
6.3" x 71.8"
SP . . . . . . . . . . . . . . . . . .
2 – 160 mm x 1950 mm
6.3" x 76.8"
Loading shovel
Boom. . . . . . . . . . . . . . . .
2 – 225 mm x 1960 mm
8.9" x 77.2"
Arm . . . . . . . . . . . . . . . . .
2 – 185 mm x 1765 mm
7.3" x 69.5"
Bucket . . . . . . . . . . . . . . .
2 – 200 mm x 1700 mm
7.9" x 66.9"
Bottom dump. . . . . . . . . .
2 – 160 mm x 435 mm
6.3" x 17.1"
SWING SYSTEM
Driven by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic motors
Swing reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Planetary gear
Swing circle lubrication . . . . . . . . . . . . . . . . . . . . . . . Grease-bathed
Swing lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil disc brake
Swing speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.8 rpm
WORKING RANGE
BACKHOE DIMENSIONS
BACKHOE BUCKET, ARM, AND BOOM COMBINATION
Unit:
mm
ft in
H
Y D R A U L I C
E
X C A V A T O R
PC1250
-8
LOADING SHOVEL
Operating weight, including
5300 mm
17'5" boom,
3800 mm
12'6"
arm,
6.5 m
3
8.5 yd
3
heaped bucket, operator, lubricants, coolant,
full fuel tank and standard equipment.
PC1250-8
Shoes
Operating Weight
Ground Pressure
Double grouser
110900 kg
142 kPa
700 mm
244,490 lb
1.45 kg/cm
2
28"
20.6 psi
PC1250-8
PC1250SP-8
Operating
Ground
Operating
Ground
Shoes
Weight
Pressure
Weight
Pressure
Double grouser
106500 kg
136 kPa
110700 kg
141 kPa
700 mm
1.39 kgf/cm
2
1.44 kgf/cm
2
28"
234,790 lb
19.8 psi
244,050 lb
20.4 psi
Double grouser
108810 kg
97 kPa
1000 mm
0.99 kgf/cm
2
–
–
39.4"
239,880 lb
14.1 psi
PC1250-8
PC1250SP-8
9.1 m
29'10" boom
7.8 m
25'7" boom
3.4 m
11'2" arm
4.5 m
14'9" arm
5.7 m
18'8" arm
3.4 m
11'2" arm
A Overall Height
6040 mm
19'10"
6460 mm
21'2"
6990 mm
22'11"
6265 mm
20'7"
B Overall Length
16020 mm
52'7"
16050 mm
52'8"
15840 mm
52'0"
14790 mm
48'6"
PC1250-8
PC1250SP-8
9.1 m
29'10" boom
7.8 m
25'7" boom
3.4 m
11'2" arm
4.5 m
14'9" arm
5.7 m
18'8" arm
3.4 m
11'2" arm
A Max. digging height
13400 mm
44'0"
13490 mm
44'3"
13910 mm
45'8"
13000 mm
42'8"
B Max. dumping height
8680 mm
28'6"
9000 mm
29'6"
9440 mm
31'0"
8450 mm
27'9"
C Max. digging depth
9350 mm
30'8"
10440 mm
34'3"
11590 mm
38'0"
7900 mm
25'11"
D Max. vertical wall
digging depth
7610 mm
25'0"
8490 mm
27'10"
9480 mm
31'1"
5025 mm
16'6"
E
Max. digging depth
of cut for 8' level
9220 mm
30'3"
10340 mm
33'11"
11500 mm
37'9"
7745 mm
25'5"
F
Max. digging reach
15350 mm
50'4"
16340 mm
53'7"
17450 mm
57'3"
14070 mm
46'2"
G Max. digging reach
at ground level
15000 mm
49'3"
16000 mm
52'6"
17130 mm
56'2"
13670 mm
44'10"
H Min. swing radius
7965 mm
26'2"
7990 mm
26'3"
8150 mm
26'9"
6415 mm
21'1"
Bucket digging force (SAE)
422 kN
422 kN
343 kN
502 kN
43000 kgf / 94,800 lb
43000 kgf / 94,800 lb
35000 kgf / 77,160 lb 51200 kgf / 112,900 lb
Arm crowd force (SAE)
392 kN
327 kN
281 kN
395 kN
40000 kgf / 88,180 lb 33300 kgf / 73,410 lb 28700 kgf / 63,270 lb 40300 kgf / 88,860 lb
Bucket digging force (ISO)
479 kN
479 kN
389 kN
570 kN
48800 kgf / 107,590 lb 48800 kgf / 107,590 lb 39700 kgf / 87,520 lb 58100 kgf / 128,110 lb
Arm crowd force (ISO)
412 kN
337 kN
286 kN
412 kN
42000 kgf / 92,590 lb
34400 kgf / 75,840 lb
29200 kgf / 64,375 lb
42000 kgf / 92,590 lb
These charts are based on over-side stability with fully loaded bucket at maximum reach.
: General purpose use, density up to 2.1 t/m
3
3,500 lb/yd
3
□
: 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
BUCKET CAPACITY (HEAPED)
WIDTH
Without Side
With Side
WEIGHT
SAE, PCSA
CECE
cutters or shrouds
cutters or shrouds
(with side cutters)
ARM LENGTH
m
3
yd
3
m
3
yd
3
mm
in
mm
in
kg
lb
m
ft in
PC1250-8 (use with 9.1 m boom)
3.4
11'2"
4.5
14'9"
5.7
18'8"
3.4
4.4
3.0
3.9
1500
59"
1670
65.7"
3600
7,940
—
□
4.0
5.2
3.5
4.6
1710
67.3"
1880
74"
3800
8,380
□
5.0
6.5
4.3
5.6
2050
80.7"
2220
87.4"
4400
9,700
□
—
5.2
6.8
4.5
5.9
2050
80.7"
2110
83.1"
5100
11,240
□
—
PC1250SP-8 (use with 7.8 m boom)
3.4
11'2"
—
—
6.7
8.8
5.9
7.7
2280
69.8"
2340
92.1"
6300
13,890
□
—
—
(R=4870
16'0"
)
A
B
4810
15'9"
4995
16'5"
6425
21'1"
50
2"
1790
5'10"
3925
12'11"
3470
11'5"
700
28"
3900
12'10"
990
3'3"
2240
7'4"
4600
15'1"
5355
17'7"
4965
16'3"
4120
13'6"
4075
13'4"
5180
17'0"
H
G
F
2
1
3
0
4
5
6
7
8
9
10
11
12
13
14
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
A
C E
B
D
8ft
