Specifications :
ENGINE
| Model | Isuzu AH-4HK1X |
| Type | 4-cycle water-cooled, direct injection |
| Aspiration | Turbocharged, intercooled |
| No. of cylinders | 4 |
| Rated power ISO 9249, net | 140 kW (188 HP) at 2 100 min-1 (rpm) |
| Rated power ECC 80/1269, net | 140 kW (188 HP) at 2 100 min-1 (rpm) |
| Rated power SAE J1349, net | 140 kW (188 HP) at 2 100 min-1 (rpm) |
| Maximum torque | 676 Nm (69 kgf m) at 1 500 min-1 (rpm) |
| Piston displacement | 5.193 L |
| Bore and stroke | 115 mm x 125 mm |
| Batteries | 2 x 12 V / 88 Ah |
HYDRAULIC SYSTEM
| Work mode selector | Digging mode / Attachment mode |
| Engine speed sensing system | |
| Main pumps | 2 variable displacement axial piston pumps |
| Main pumps Maximum oil flow | 2 x 236 L/min |
| Pilot pump | 1 gear pump |
| Pilot pump Maximum oil flow | 34 L/min |
Hydraulic Motors
| Travel | 2 variable displacement axial piston motors |
| Swing | 1 axial piston motor |
Relief Valve Settings
| Implement circuit | 34.3 MPa (350 kgf/cm2) |
| Swing circuit | 32.4 MPa (300 kgf/cm2) |
| Travel circuit | 34.3 MPa (350 kgf/cm2) |
| Pilot circuit | 3.9 MPa (40 kgf/cm2) |
| Power boost | 36.3 MPa (370 kgf/cm2) |
Hydraulic Cylinders
High-strength piston rods and tubes. Cylinder cushion
mechanisms provided in boom and arm cylinders to absorb shock at stroke
ends.
Dimensions
Hydraulic Filters
Hydraulic circuits use high-quality hydraulic filters. A
suction filter is incorporated in the suction line, and full-flow
filters in the return line and swing / travel motor drain lines.
CONTROLS
Pilot controls. Hitachi's original shockless valve.
| Implement levers | 2 |
| Travel levers with pedals | 2 |
UPPERSTRUCTURE
Revolving Frame
Welded sturdy box construction, using heavy-gauge steel plates for ruggedness. D-section frame for resistance to deformation.
Swing Device
Axial piston motor with planetary reduction gear is bathed in
oil. Swing circle is single-row, shear-type ball bearing with
induction-hardened internal gear. Internal gear and pinion gear are
immersed in lubricant.
Swing parking brake is spring-set/hydraulic-released disc type.
Swing parking brake is spring-set/hydraulic-released disc type.
| Swing speed | 12.6 min-1 (rpm) |
Operator's Cab
Independent spacious cab, 1 005 mm wide by 1 675 mm high,
conforming to ISO* Standards. Reinforced glass windows on 4 sides for
visibility. Front windows (upper and lower) can be opened. Reclining
seat with armrests; adjustable with or without control levers.
* International Standardization Organization
* International Standardization Organization
UNDERCARRIAGE
Tracks
Tractor-type undercarriage. Welded track frame using selected materials.
Side frame welded to track frame. Lubricated track rollers, idlers, and sprockets with floating seals.
Track shoes with triple grousers made of induction-hardened rolled alloy.
Heat-treated connecting pins with dirt seals. Hydraulic (grease) track adjusters with shock-absorbing recoil springs.
Side frame welded to track frame. Lubricated track rollers, idlers, and sprockets with floating seals.
Track shoes with triple grousers made of induction-hardened rolled alloy.
Heat-treated connecting pins with dirt seals. Hydraulic (grease) track adjusters with shock-absorbing recoil springs.
Numbers of Rollers and Shoes on Each Side
| Upper rollers | 2 |
| Lower rollers | 7 : ZX270-3 8 : ZX270LC-3 |
| Track shoes | 45 : ZX270-3 48 : ZX270LC-3 |
| Track guard | 1 |
Travel Device
Each track driven by 2-speed axial piston motor through
planetary reduction gear for counterrotation of the tracks. Sprockets
are replaceable.
Parking brake is spring-set/hydraulic-released disc type. Travel shockless relief valve built in travel motor absorbs shocks when stopping travel.
Automatic transmission system: High-Low.
Parking brake is spring-set/hydraulic-released disc type. Travel shockless relief valve built in travel motor absorbs shocks when stopping travel.
Automatic transmission system: High-Low.
| Travel speeds | High : 0 to 5.5 km/h Low : 0 to 3.3 km/h |
| Maximum traction force | 246 kN (25 100 kgf) |
| Gradeability | 70 % (35 degree) continuous |
WEIGHTS AND GROUND PRESSURE
ZX270-3:
Equipped with 6.20 m boom, 3.11 m arm and 1.10 m3 bucket (SAE, PCSA heaped).
ZX270LC-3:
Equipped with 6.20 m boom, 3.11 m arm and 1.10 m3 bucket (SAE, PCSA heaped).
Weight of the basic machines [including 6 100 kg counterweight
and triple grouser shoes, excluding front-end attachment, fuel,
hydraulic oil, engine oil and coolant etc.] are:
| ZX270-3 | 21 300 kg with 600 mm shoes |
| ZX270LC-3 | 22 000 kg with 600 mm shoes |
SERVICE REFILL CAPACITIES
| Fuel tank | 500.0 L |
| Engine coolant | 26.0 L |
| Engine oil | 23.0 L |
| Swing device | 11.7 L |
| Travel device (each side) | 9.2 L |
| Hydraulic system | 290.0 L |
| Hydraulic oil tank | 156.0 L |
BACKHOE ATTACHMENTS
Boom and arms are of welded, box-section design. 6.20 m boom,
and 2.42 m, 3.11 m, and 3.76 m arms are available. Bucket is of welded
steel structure. Side clearance adjust mechanism provided on the bucket
joint bracket.
Buckets
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