SD8 is elevated sprocket, track-type bulldozer. Its undercarriage system is elastic suspended, elevated sprocket, hydraulic direct drive, and hydraulic controls. SD8 dozer can be equipped with S-blade, single shank ripper. Main structure uses high strength plate and is suitable for working in stony, worse earth condition. The cab is installed Rops device and comfortable seat.

Main specifitions

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 × 3952(with single shank ripper)

Gradability           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 operating rate (moving distance 40m )      452m 3 /h

Diesel engine specifications

Model                     NTA855-C400 (BC Ⅲ )

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 clutch

Steering and braking clutch are adjustment-free, oil-type, multi-disc clutch. The braking clutch is pressed by spring, separated hydraulicaly, 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 traveling and traction is raised.

R.o.p.s cab

The cab is hexagonal thin wall box-type structure. Glass is mounted at six sides with wide viewing range. Pulling and pushing glass is mounted at back side. Air conditioner can be installed according to the requirement of customer. The structure of Rops is rigid. It can protect the driver efficiently when the bulldozer is in special condition. Adjustable operator ' s seat bias to right 15 ° and fuel tank, engine hood, track are tilting, the driver can has 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 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. 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, torque converter outlet relief valve, filler and oil line, etc. Main pump is three group gear pump. The main performance is as following:

Lubricating pump                 Rated displacement     90    ml/r

                               Rated pressure         0.4    MPa

                               Rated speed           2000   r/min

Working pump                   Rated displacement     115    ml/r

                               Rated pressure         3.1    MPa

                               Rated speed           2000   r/min

Oil draining pump                Rated displacement     160    m/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

s-blade         1765mm       4172 mm        13.0 m 3

Ripper

Type                   single, adjustable hydraulic ripper

Rippering angle          45 °

Max. penetration      1150mm

Max. lifting height     830mm