NK8G
NK8 is elevated sprocket, track-type bulldozer. Its undercarriage system is elastic suspended, elevated sprocket,hydraulic direct drive, and hydraulic controls. NK8G dozer can be equipped with S-blade, single shank ripper. Mainstructure uses high strength plate and is suitable for working in stony, worse earth condition. The cab is installedRops device and comfortable seat.
Main specifications
| Operating weight(not including ripper) | 40000㎏ | |
| Ripper weight | 4300㎏ | |
| Engine flywheel power | 246Kw(335HP)/1900r/min | |
| Track ground contact length | 3280 mm | |
| Ground pressure(without ripper) | 105 KPa | |
| Track contact length | 2200mm | |
| Width of shoe | 560mm | |
| Overall dimensions(L×W×H) | 8090×4172×3952(with single shank ripper) | |
| Gradeability | latitude30 ° transverse 25° | |
| Ground clearance | 485mm | |
| Theory travel speed (km/h) | 1st gear forward 0-3.9 | 1st gear backward 0-4.8 |
| 2nd gear forward 0-6.8 | 2nd gear backward 0-8.4 | |
| 3rd gear forward 0-11.9 | 3rd gear backward 0-14.8 | |
| Dozing operation rate (moving distance 40m) | 452m/h3 | |
Diesel engine specifications
| Model | NTA855-C400 (BCⅢ) |
| Type | water cooled, single line, four strokes, turbocharged, 6-cylinders, diameter 140mm |
| Rated speed | 1900r/min |
| Flywheel power(speed at 2100 rpm) | 246kw(335HP) |
| Torque storage coefficient | 24.5% |
| Starting mode | 24v electric starting |
Torque converter
Power separating, hydraulic-mechanic drive, single stage torque converter is used in SD8 elevate sprocketbulldozer.
Transmission assembly
It integrates center drive, transmission and speed changing control valve into one component. It can be assembledor disassembled as assembly or as a part. It is very convenient to service. Transmission is multi-stage planetarydrive to realize modular assembling and disassembling. Gear the shift can be changed among 1st gear, 2nd gear,3rd gear forward or reverse rapidly, through multi-functional control valve.
Steering and braking clutch
Steering and braking clutch are adjustment-free, oil-type, multi-disc clutch. The braking clutch is pressed by spring,separated hydraulically, constant meshed type. Steering clutch is hydraulic pressed, non-constant engaged clutch.Steering and braking acts simultaneously, operated manually to realize steering slowly, sharply and braking. Thebraking of entire machine can be realized through the pedal. Braking rod is designed to keep the undercarriagesystem in braking condition and guarantee the machine not to slip on slope when starting the engine.
Final drive
Final drive is two-stage planetary reduction gear mechanism. It is mounted at outside of steering and brakingclutch. Combined sprocket segment is very convenient for assembling, disassembling and service.
Undercarriage system
TD8 dozer utilizes elastic-mounted undercarriage. The track is triangle shape. The sprocket is elevated. Throughfloating function of continuous auxiliary suspension device, the machine can travel near obstacle on the ground toimprove traveling stability and comfortable of the driver. Ground contact area is increased. Performance oftraveling and traction is raised.
ROPS cab
The cab is hexagonal thin wall box-type structure. Glass is mounted at six sides with wide viewing range. Pullingand pushing glass is mounted at backside. Air conditioner can be installed according to the requirement ofcustomer. The structure of ROPS is rigid. It can protect the driver efficiently when the bulldozer is in specialcondition. Adjustable operator’s seat bias to right 15° and fuel tank, engine hood, track are tilting, the driver canhas a good front and rear sighting range.
Implement hydraulic system
Implement hydraulic system can control lifting, lowering and tilting of the blade. It also can control the moving ofripper. It mainly consists of oil pump, cylinder, valve group, oil tank line and controlling parts. Implement pump istwo group vane type pump. The main specification is as following:
| Front pump: Displacement | 129ml/r |
| Rated pressure | 21MPa |
| Rated speed | 2000r/min |
| Rear pump: Displacement | 56ml/r |
| Rated pressure | 21MPa |
| Rated speed | 2000r/min |
| Rated operation pressure of blade lifting system | 17.5MPa |
| Rated operation pressure of tilting system | 18.3MPa |
Hydraulic system of tractor
It is composed of oil pump, transmission control valve, steering and braking control valve, sequence valve, torqueconverter outlet relief valve, filler and oil line, etc. Main pump is three group gear pump. The main performance isas following:
| Lubricating pump | Rated displacement | 90ml/r |
| Rated pressure | 0.4 MPa | |
| Rated speed | 2000 r/min | |
| Working pump | Rated displacement | 115ml/r |
| Rated pressure | 3.1 MPa | |
| Rated speed | 2000 r/min | |
| Oil draining pump | Rated displacement | 160m/r |
| Rated pressure | 0.5 MPa | |
| Rated speed | 2000 r/min |
Maintenance filling capacity
| Fuel tank | 753L |
| Water tank and diesel engine cooling water | 125L |
| Camshaft case of diesel engine | 47L |
| Bevel gear case hydraulic system of tractor | 167L |
| Final drive (one side) | 23L |
| Rear seat buffer spring case (each side) | 30L |
| Pivot lubricating | 13L |
| Implement system oil tank | 89L |
Blade
| Type | Height | Width | Capacity |
| Semi-U blade | 1765mm | 4172 mm | 13.0 m3 |
Ripper
| Type | single, adjustable hydraulic ripper (option of three shanks ripper) |
| Rippering angle | 45° |
| Max. Lifting height | 1150mm |
| Max. Lifting height | 830mm |
|
Blad |
Ground |
Overall |
Blade |
Overall |
Blade |
Track center |
Penetrating length |
Lifting |
Blade |
|
Straight tilting blade (semi U-blade) (With single ripper) |
3280 | 8090 | 1765 | 3952 | 417 | 22200 | 614 | 1288 | 13.0 |
|
Straight tilting blade (semi U-blade) (With traction mechanism) |
3280 | 6755 | 1765 | 3952 | 4172 | 2200 | 614 | 1288 | 13.0 |
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