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PC270-7
H
Y D R A U L I C
M
AINTENANCE
Easy Maintenance
Komatsu designed the PC270-7 to have easy service access.
We know by doing this, routine maintenance and servicing are
less likely to be skipped, which can mean a reduction in costly
downtime later on. Here are some of the many service features
found on the PC270-7.
● Easy Radiator Cleaning
Clearance between radiator
and oil cooler is increased
to facilitate radiator core
cleaning with an air nozzle.
Easy Radiator Cleaning
● Water Separator is standard
equipment, removing water
mixed in fuel and preventing
fuel system damage.
● Easy Access to Engine
Oil Filter and Fuel Drain
Valve. Engine oil filter and
Remote
fuel drain valve are remotely
Mounted
mounted to improve
Engine Oil Filter
accessibility.
● Easy Cab Filter Maintenance
Tool free removal of the internal and external cab filters.
Inner Air Filter
Outer Air Filter
Removal and installation of air conditioner filter element,
without tools, facilitates cleaning.
● Fuel Tank Capacity Increased
Fuel tank capacity is increased from 340 ltr 89.8 U.S. gal
to 400 ltr 105.7 U.S. gal to extend operating hours before
refueling. The fuel tank is treated for rust prevention and
improved corrosion resistance.
8
E
X C A V A T O R
F
EATURES
Reducing Maintenance Costs
● Hydraulic Oil and Filter/Engine Oil and Filter
Replacement Interval Extended
The new high performance filters are used in the hydraulic
circuit and engine. Hydraulic oil filter, engine oil, and
engine oil filter element replacement intervals are significantly
extended to reduce maintenance costs.
Comparison of Replacement Intervals
PC270-7
Engine oil
500
Engine oil filter
500
Hydraulic oil
5,000
Hydraulic oil filter
1,000
All Work Equipment Lubrication Intervals are
500 Hours with SCSH Bushings (Excluding Bucket)
Newly developed SCSH bushings are used on bucket and arm
top bushing; end faces are injected with Tungsten Carbide.
Water
All bushing lubrication intervals of work equipment are
Separator
extended from 100 hours to 500 hours (excluding the
bucket) reducing maintenance costs.
SCSH (Steel Copper Sinter
Hard Material) bushing is
based on ferroalloy powder
Special Lubricants
Contained in Pores
metallurgy (carbonized
treatment). It contains a special
lubricant in pores, and the hard
particles are diffused to
improve durability for wear
Hard Particles Diffused
and scratching.
Tungsten Carbide Injected Bushing
Tungsten Carbide is injected into the end faces of the arm top
bushing to form a hard film, reducing wear of contacting
surfaces and fluttering of the bucket.
Tungsten Carbide
Injected
S
PECIFICATIONS
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SAA6D102E-2
Type . . . . . . . . . . . . . . . . . . . . Water-cooled, 4-cycle, direct injection
Aspiration . . . . . . . . . . . . . . . . . . . . . . Turbocharged and aftercooled
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 mm 4.02"
Stroke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 mm 4.72"
Piston displacement . . . . . . . . . . . . . . . . . . . . . . . . . . 5.88 ltr 359 in
Flywheel horce Power
SAE J1349 . . . . . . . . . . . . . . . . . . . 134 kW 179 HP @ 2050 rpm
unit: hours
DIN 6270 . . . . . . . . . . . . . . . . . . . . . 134 kW 182 PS @ 2050 rpm
Governor . . . . . . . . . . . . . . . . . . . . . . . All-speed control, mechanical
PC250-6
Meets 2001 EPA, EU, and Japan Tier 2 emission regulations.
250
250
5,000
HYDRAULICS
500
Type . . HydrauMind (Hydraulic Mechanical Intelligence New Design)
system, closed-center system with load sensing valves and
Number of selectable working modes . . . . . . . . . . . . . . . . . . . . . . . 4
Main pump:
Type . . . . . . . . . . . . . . . . . . . . . Variable displacement piston type
Pumps for . . . . . . . . Boom, arm, bucket, swing, and travel circuits
Maximum flow. . . . . . . . . . . . . . . . . . 450 ltr/min 119 U.S. gal/min
Supply for control circuit . . . . . . . . . . . . . . . . . Self-reducing valve
Hydraulic motors:
Travel . . . . . . . . . . . . . . . 2 x axial piston motor with parking brake
Swing . . . . . . . . . . 1 x axial piston motor with swing holding brake
Relief valve setting:
SCSH Bushing
Implement circuits. . . . . . . . . . . . 37.3 MPa 380 kgf/cm
Travel circuit . . . . . . . . . . . . . . . . 37.3 MPa 380 kgf/cm
Swing circuit . . . . . . . . . . . . . . . . 28.4 MPa 290 kgf/cm
Pilot circuit. . . . . . . . . . . . . . . . . . . . . 3.2 MPa 33 kgf/cm
Hydraulic cylinders:
Cu (Copper)
(Number of cylinders – bore x stroke x rod diameter)
Boom . . . . . 2 – 140 mm x 1300 mm x 100 mm 5.5" x 51.2" x 3.9"
Arm . . . . . . 1 – 150 mm x 1635 mm x 110 mm 5.9" x 64.3" x 4.3"
Bucket . . . . 1 – 140 mm x 1009 mm x 100 mm 5.5" x 39.7" x 3.9"
DRIVES AND BRAKES
Steering control . . . . . . . . . . . . . . . . . . . . . . . Two levers with pedals
Drive method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydrostatic
Maximum drawbar pull . . . . . . . . . . . . . 249 kN 25400 kgf 56,000 lb
Gradeability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70%, 35°
Maximum travel speed: High 5.5 km/h 3.4 mph *(4.5 km/h 2.8 mph)
(Auto-Shift)
Service brake
Parking brake . . . . . . . . . . . . . . . . . . . . . . . . .Mechanical disc brake
HYDRAULIC EXCAVATOR
SWING SYSTEM
Drive method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydrostatic
Swing reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Planetary gear
Swing circle lubrication . . . . . . . . . . . . . . . . . . . . . . . Grease-bathed
Service brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic lock
Holding brake/Swing lock . . . . . . . . . . . . . . . . Mechanical disc brake
Swing speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.5 rpm
3
UNDERCARRIAGE
Center frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-frame
Track frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Box-section
Seal of track . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sealed track
Track adjuster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic
Number of shoes (each side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Number of carrier rollers . . . . . . . . . . . . . . . . . . . . . . . . . 2 each side
Number of track rollers (each side) . . . . . . . . . . . . . . . . . . . . . . . . . 7
pressure compensated valves
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 ltr 105.7 U.S. gal
Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.9 ltr 8.2 U.S. gal
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.0 ltr 6.3 U.S. gal
Final drive, each side . . . . . . . . . . . . . . . . . . . . . . 7.8 ltr 2.1 U.S. gal
Swing drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6 ltr 1.7 U.S. gal
Hydraulic tank . . . . . . . . . . . . . . . . . . . . . . . . . . 143 ltr 37.8 U.S. gal
5,400 psi
2
OPERATING WEIGHT
2
5,400 psi
Operating weight including 5850 mm 19'2" one-piece boom,
2
4,125 psi
3045 mm 10'0" arm, SAE heaped 1.26 m
2
470 psi
rated capacity of lubricants, coolant, full fuel tank, operator, and
standard equipment.
Shoes
600 mm
23.6"
700 mm
27.6"
800 mm
31.5"
*(264 kN 26900 kgf 59,300 lb)
Mid 4.1 km/h 2.5 mph *(3.3 km/h 2.1 mph)
Low 3.0 km/h 1.9 mph *(2.8 km/h 1.8 mph)
Hydraulic lock
*with optional heavy duty travel motor
PC270-7
0
COOLANT AND LUBRICANT
CAPACITY
(REFILLING)
(APPROXIMATE)
3
1.65 yd
3
backhoe bucket,
PC270-7
Operating
Ground
Weight
Pressure
26900 kg
55 kPa 0.56 kgf/cm
2
59,300 lb
7.96 psi
27460 kg
48 kPa 0.49 kgf/cm
2
60,540 lb
6.97 psi
27810 kg
42 kPa 0.43 kgf/cm
2
61,310 lb
6.15 psi
9
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