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18

ENGINE

Model . ........................................................................ Isuzu AH-4HK1X Type .............................................. 4-cycle water-cooled, direct injection Aspiration ...................................................... Turbocharged, intercooled No. of cylinders .................................................................................... 4 Rated power

ISO 9249, net . .......................... 132 kW (177 HP) at 2 000 min -1 (rpm) ECC 80/1269, net ..................... 132 kW (177 HP) at 2 000 min -1 (rpm) SAE J1349, net ......................... 132 kW (177 HP) at 2 000 min -1 (rpm) Maximum torque ...................... 673 N.m (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 Maximum oil fow .......................................................... 2 x 216 L/min Pilot pump . ........................................................................ 1 gear pump Maximum oil fow .................................................................. 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/cm 2 ) Swing circuit . .................................................... 32.4 MPa (300 kgf/cm 2 ) Travel circuit ...................................................... 34.3 MPa (350 kgf/cm 2 ) Pilot circuit ............................................................ 3.9 MPa (40 kgf/cm 2 ) Power boost ..................................................... 36.3 MPa (370 kgf/cm 2 )

Hydraulic Cylinders

High-strength piston rods and tubes. Cylinder cushion mechanisms provided in boom and arm cylinders to absorb shock at stroke ends.

Dimensions

Quantity Bore Rod diameter

Boom 2 125 mm 90 mm

Arm 1 140 mm 100 mm

Bucket 1 130 mm 90 mm

Positioning 1 150 mm 100 mm

Hydraulic Filters

Hydraulic circuits use high-quality hydraulic flters. A suction flter is incorporated in the suction line, and full-fow flters 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 rug-gedness. 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 inter-nal gear. Internal gear and pinion gear are immersed in lubricant. Swing parking brake is spring-set/hydraulic-released disc type.

Swing speed ................................................................. 13.5 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

UNDERCARRIAGE

Tracks

Tractor-type undercarriage. Welded track frame using selected materials. Side frame welded to track frame. Lubricated track rollers, idlers, and sprockets with foating 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 ................................. ....................................................... 9 Track shoes ................................. . .................................................... 51 Track guard .......................................................................................... 1

Travel Device

Each track driven by 2-speed axial piston motor through planetary reduc-tion 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.

Travel speeds ......................................................... High : 0 to 5.5 km/h Low : 0 to 3.4 km/h Maximum traction force . ......................................... 222 kN (22 650 kgf) Gradeability .......................................................... 35° (70%) continuous

ReviseKS-EN001EUQ.indd 18 6/27/08 6:26:

Page 18 - brochures

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