NK7

NK7 bulldozer is 220 horsepower track-type dozer with elevated sprocket, hydraulic direct drive, semi-rigid suspended and hydraulic controls.It can be equipped with straight tilting blade, angle blade,  coal  pushing  blade,  single shank  ripper,  three  shanks  ripper.  The  cab  is  Rops  with  air conditioner.

NK7-220 horsepower,elevated sprocket bulldozer integrate modern science into it,its new structure,good performance,high working efficiency, safety and comfortable operation condition,reliable entire quality,excellent service is your wise choosing.

Main specifications

Operating weight(not including ripper) 23800㎏
Ripper weight 3900㎏
Engine flywheel power 162 KW
Ground pressure(without ripper) 71.9 kPa
Ground clearance 404mm
Ground contact length 2890mm
Track center distance 1980mm
Overall dimensions(L×W×H)：(with single shank ripper) 7604×3823×3402 (with straight tilting blade)
Gradeability Latitude30 °    Transverse 25°
Theory travel speed (km/h)  
1st gear forward 0-3.9 1stgear backward 0-4.8
2nd gear forward 0-6.5 2nd gear backward 0-8.2
3rd gear forward 0-10.9 3rd gear backward 0-13.2
Dozing operation rate (moving distance 40m) 350m3/h

 Diesel engine specifications

Model NT855-C280 (Cummins)
Type Water cooled, single line, vertical, four strokes,  turbocharged, 6-cylinders,diameter 140mm
Rated speed 2100 RPM
Flywheel power(speed at 2100 rpm) 162 kW
Starting mode 24V electric starting

Torque converter
Torque converter used in TD7 bulldozer is power separating hydraulic-mechanic type.

Transmission assembly
It integrates center drive,transmission and speed changing control valve into one component.It can be assembled or disassembled as a  assembly or as a part.It is very convenient to service.Transmission is multi-stage planetary gear drive to realize modular assembling and disassembling.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 clutch 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.The action of steering and braking is combined,operation manually to realize steering slowly,sharply and braking.The braking of entire machine can  be  realized through the pedal.Parking braking rod is designed to keep the undercarriage system in braking condition when starting the engine and guarantees 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 braking clutch.Combined sprocket segment is very convenient for assembling, disassembling
and service.
Hydraulic system of the machine
It  is  composed  of  oil  pump,  transmission  control  valve,  steering  and  braking  control valve,sequence valve, relief valve at torque convertor outlet, filter and lines.

Main pump Gear pump
Oil flow 160  L/min
Working pressure 3.1  MPa

Rops with air conditioner cab
The cab is hexagonal thin wall box-type structure. Glass is mounted at six sides with wide viewing
area.  Pulling  and  pushing  glass  is  installed  at  backside.  Air  conditioner  is  top-mounted  with functions of cooling and heating. The structure of Rop is rigid. It can protect the driver efficiently when the bulldozer is in special condition.

Implement hydraulic system
Implement hydraulic system can control lifting, lowing and tilting of the blade. It also can control
lifting,  lowing  of  the  ripper.  It mainly  consists of  oil pump,  cylinder,  inlet  valve  group  diverter
valve group, oil tank line and controlling parts. 

Main pump  High pressure gear pump
Oil flow 194  L/min
System working pressure    18.6  MPa

Left and right undercarriage system
The track is triangle shape. The sprocket is elevated. There are two idlers in front and at rear of the
frame and seven-track roller. Recoil spring and cylinder adjuster is mounted at the undercarriage.
The rear end of undercarriage frame is supported on the pivot. The front end is articulated with the
equalizer  bar.  Choosing  different  undercarriage  system  according  to  different  implement.  The customer  is  required can guarantee  center gravity of  the machine  to be at best efficient position. Choosing different width of  track shoe can ensure  the bulldozer developing  its  optimum  traction efficiency .  

Maintenance filling capacity

Fuel tank 450L
Water tank of cooling system 118L
Camshaft box of the engine 20L
Bevel gear case 150L
Implement oil tank 100L
Pivot lubricating tank 15L
Final drive 15L

Optional implement and components     (＊ordinary)
1)cab 
A、Rops with air conditioner cab       ＊
B、Rops cab
C、Rops canopy
2)Front mounted implement
A、straight tilting blade          ＊
B、Angle blade 
C、U-type blade
3)Rear mounted implement
A、single shank ripper              ＊
B、three shanks ripper
C、back drawing mechanism
4)Track shoe of undercarriage
Optional track shoe width 
A、510mm           B、560mm        ＊
C、660mm           D、914mm

winch  dozer  used  in  forest,  desert  dozer,  LGP  dozer  ,HW  dozer  can  be  chosen  according  to special requirements of customer.

Blad
type

Track ground
contact length(A)

Length of
machine(B)

Blade
height(C)

Overall
height(D)

Blade
width(E)

Track
center
distance(F)

Digging
depth

Lifting
height

Blade
capacity

Straight
tilting
blade

 2895 7604 1280 3402 3823 1980 500 1170 6.3

Coal
pushing
blade

 2895 7880 1350 3402 4428 1980 670 1115 8.1

Angle
blade

 2895 7571 1100 3402 4253 1980 670 1115 5.2

LGP
blade

 3185 7190 1150 3482 4382 2235 635    

 

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