SD8 bulldozer

Main specifications

Operating weight(not including ripper)

40000

Ripper weight 

4300

Engine flywheel power/RPM

246 kw(335HP)/1900r/min

Track ground contact length 

3280 mm

Ground pressure(without ripper) 

105 kPa

Track contact length 

2200 mm

Overall dimensions(L×W×H)

8090×4172×3952mm (with single shank ripper)

Gradeability

Latitude 30 °   Transverse 25°

Ground clearance  

485mm

Theory travel speed  (km/h)

Forward

Reverse

First  speed

0-3.9

First  speed

0-4.8

Second speed

0-6.8 

Second speed

0-8.4

Third speed

0-11.9 

Third speed

0-14.8

Dozing operating rate (moving distance 40m)  

452 m3/h

Diesel Engine

Model

NTA855-C400 (BC)

Type   

water cooled, single line, four strokes, turbocharged, 6-cylinders, diameter 140mm

Rated speed 

1900r/min

Flywheel power

246kw(335HP)

Torque storage coefficient 

24.5%

Start mode

24v electric starting

Torque converter

Power separating, hydraulic-mechanic drive, single stage torque converter is used in SD8 elevale sprocket bulldozer.

Transmission assembly

 It integrates center drive, transmission and speed changing control valve into one component. It can be assembled or disassembled as assembly or as a part. It is very convenient to service. Transmission is multi-stage planetary drive 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

Steering and braking clutch are adjustment-free, oil-type, multi-disc clutch. The braking clutch is pressed by spring, separated hydraulicly, 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. The braking of entire machine can be realized through the pedal. Braking rod is designed to keep the undercarriage system 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 braking clutch. Combined sprocket segment is very convenient for assembling, disassembling and service.

Undercarriage system

SD8 dozer utilizes elastic-mounted undercarriage. The track is triangle shape. The sprocket is elevated. Through floating function of continuous auxiliary suspension device, the machine can travel near obstacle on the ground to improve travelling stability and comfortable of the driver. Ground contact area is increased. Performance of travelling and traction is raised.

Implement hydraulic system

Implement hydraulic system can control lifting, lowering and tilting of the blade. It also can control the moving of ripper. It mainly consists of oil pump, cylinder, valve group, oil tank line and controlling parts. Implement pump is two group vane type pump.

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, torque converter outlet relief valve, filler and oil line, etc. Main pump is three group gear pump.

Lubricating pump 

Displacement

90    ml/r

Rated pressure

0.4    MPa

Rated speed 

2000   r/min

Working pump 

Displacement

115    ml/r

Rated pressure

3.1    MPa

Rated speed 

2000   r/min

Oil draining pump  

Displacement

160    m/r

Rated pressure

0.5    MPa

Rated speed 

2000   r/min

Cab

Type

Simple structure canopy

Alternative

Cab with air-conditioner

Cab with Rops