NK8G

NK8G 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
type

Ground
contact
length (A)

Overall
length(B)

Blade
height(C)

Overall
height(D)

Blade
width (E)

Track center
distance (F)

Penetrating length

Lifting
height

Blade
capacity

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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