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EX1900

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ENGINE

Model Cummins QSKTA38-CE
Type Water-cooled, 4-cycle,V12-cylinder, turbo-charged and after cooled, direct injection chamber-type diesel engine
Rated power SAE J1995, gross 810 kW (1 086 HP) at 1 800 min-1 (rpm)
Rated power Net 775 kW (1 039 HP) at 1 800 min-1 (rpm)
Maximum torque 4 725 Nm (482 kgf m) at 1 300 min-1 (rpm)
Piston displacement 37.8 L
Bore and stroke 159 mm X 159 mm
Starting system 24 V electric motor
Batteries 4 x 12 V , 4 x 220 AH
Cold starting Ether aided

HYDRAULIC SYSTEM

Hitachi's ETS (Electronic Total control System) can achieve maximum job efficiency by reducing fuel consumption and noise levels, while maximizing productivity through the optimization of engine-pump functions with excellent controllability increasing operator comfort.

E-P Control (Computer-aided Engine-Pump Control system) Main pumps regulated by electric engine speed sensing control system.
OHS (Optimum Hydraulic System) 6 main pumps and 3 valves system enable both independent and combined operations of all functions.
FPS (Fuel-saving Pump System) FPS minimizes energy loss with superior performance in fine control.
Auto-idling system for saving fuel and reducing noise.  
Hydraulic drive cooling-fan system for oil cooler.  
Forced-lubrication and forced-cooling pump drive system.  
Main pumps 6 variable-displacement, piston pumps for front attachment, travel and swing
Main pumps Max. oil flow 6 X 335 L/min
Pilot pump 1 gear pump
Pilot pump Max. oil flow 110 L/min

Relief Valve Settings

Boom/arm/bucket circuit 29.4 MPa (300 kgf/cm2)
Travel circuit 29.4 MPa (300 kgf/cm2)
Swing circuit 29.4 MPa (300 kgf/cm2)
Pilot circuit 4.4 MPa (45 kgf/cm2)

Hydraulic Cylinders

High-strength piston rods and tubes adopted. Cylinder cushion mechanisms are provided for boom, arm bucket and dump cylinders. Bucket cylinders of loading shovel are provided with protector.

Cylinder Dimensions

Loading shovel  

Backhoe  

Hydraulic Filters

All hydraulic circuits have high-quality hydraulic filters for protection against oil contamination and longer life of hydraulic components.

These filters are centralized in arrangement for facilitating maintenance.

CONTROLS

2 Implement Levers

Electric joystick control levers. Right lever is for boom and bucket control, left lever for swing and arm control. For loading shovel, 2 pedals provided for opening/closing the bottom dump bucket.

2 Travel Levers with Pedals

Remote-controlled hydraulic servo system. Independent drive at each track allows counter rotation of tracks.

UPPERSTRUCTURE

Revolving Frame

A deep, full-reinforced box section. Heavy-gauge steel plates used for ruggedness.

Deck Machinery

Maintenance accessibility is the major feature in the lay-out of deck machinery. Sidewalks provides easy access to engine, hydraulic and electrical components. ISO-meet stairs and handrails. Sidewalks and stairs are provided with skid-resistant plates.

Swing Device

2 high-torque, axial-piston motors with two-stage planetary gear run in oil. Diametrically-opposed,well-balanced arrangement of 2 swing devices. Swing circle with dirt seals is a heavy-duty, single-row, shear-type ball bearing. Induction-hardened internal swing circle gear and pinion immersed in lubricant. Parking brake of spring-set/hydraulic-released disc type. This parking brake is manually releasable.

Swing speed 4.7 min-1 (rpm)

Operator's Cab

The sturdy cab, with the top guard conforming to OPG Level ll (ISO), helps protect the operator from falling objects. Independent, pressurized, 1 800 mm wide, 2 150 mm high, roomy 7.5m3 cab with tinted-glass windows features all-round visibility. Air-suspension type, fully adjustable reclining seat with armrests; movable with or without front & swing control levers by slide. Instruments and control panel are within easy reach of the operator. 3 air conditioner system.

Noise level 72 dB(A) in the cab; on max. engine speed under no-load
Eye level height 6 030 mm

UNDERCARRIAGE

Tracks

Tractor-type undercarriage. Dual-flanged-type bolt linkage for side frame and X-form center frame assures durability. Heavy-duty track frame of all-welded, stress-relieved structure. Top-grade materials used for toughness. Lifetime-lubricated induction-hardened track rollers, idlers and sprockets with floating seals. Track shoes of durable box-type cast steel with triple grousers. Durable strut-reinforced track links with track guards. Hydraulic track adjuster provided with N2 gas accumulator with relief valve. Track adjuster provided with protection device against abnormal tension. Travel motion alarm device.

Tractor-type Undercarriage

Triple grouser track shoes of induction-hardened cast steel.

Shoe width 800 mm

Numbers of Rollers and Shoes on Each Side

Upper rollers 3
Lower rollers 8
Track shoes 49

Travel Device

Each track driven by high-torque, axial piston motors, allowing counter rotation of tracks. 2-stage planetary gear plus spur gears reduction device. Parking brake of spring-set/hydraulic-released disc type. This parking brake is manually releasable.

Travel speeds High : 0 to 2.8 km/h
Low : 0 to 2.1 km/h
Maximum traction force 941.5 kN (96 000 kgf)
Gradeability 58 % (30 degree) max.

WEIGHTS AND GROUND PRESSURE

Loading Shovel

Equipped with 11.0 m3 (heaped) bottom dump bucket

Backhoe

Equipped with 8.3 m boom, 3.6 m arm and 12.0 m3 (SAE,PCSA heaped) bucket

SERVICE REFILL CAPACITIES

LOADING SHOVEL ATTACHMENTS

Boom and arm are of all-welded, low-stress, high-tensile strength steel full-box section design. Efficient, automatic level crowding achieved by one-lever control as the parallel link mechanism keeps the bucket digging angle constant, and level cylinder circuit maintains the bucket height constant (Auto-Leveling Crowd Mechanism).

110 kgf/mm2 tensile strength steel bucket bottom plate  
Dual-support-type boom/arm/bucket pin linkage  
Pin seals (in all portions) plus O-ring at arm top  

Bucket

BACKHOE ATTACHMENTS

Boom and arm are of all-welded, low-stress, full-box section design. Bucket of all-welded, high-strength steel structure. Bucket/arm joint pins are floating type. Replaceable thrust plates are provided with bucket/arm joint part. Auto-lubrication system for all pins is standard.

Bucket

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