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SD7 Bulldozer

SD7 Bulldozer



SD7 bulldozer is 230 horsepower track-type dozer with elevated sprocket, power shift drive, semi-rigid suspended and hydraulic controls.

SD7-230 horsepower, elevated sprocket bulldozer integrate with modular design is easy to repair & maintenance, It relieves oil with difference pressure, the hydraulic system performs protecting environment and save energy with high working efficiency. Safety comfortable operation condition, electric monitoring and ROPS cabin with reliable entire quality, excellent service is your wise choosing.

It can be equipped with straight tilting blade, angle blade, coal pushing blade, U shape blade; single shank ripper, three shanks ripper; ROPS, FOPS, forest defence cabin etc.. It is can ideal machine used in communication, oil field, power, mining etc. large earth moving program.




Main specifications

Operating weight

(not including ripper)


Ripper weight    


Engine flywheel power 


Ground pressure(without ripper)


Ground clearance


Ground contact length


Track center distance    


Overall dimensions(L×W×H)

(with single shank ripper)

7604×3823×3402(with straight tilting blade)

Grade ability

Latitude30 °   Transverse 25°

Theory travel speed    (km/h)

1st gear forward 0-3.9

1st gear 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) 


Diesel Engine


NT855-C280 (Cummins) or C6121ZLG10 (Licensed CAT 3306 diesel engine)


water cooled, single line, vertical, four strokes, turbocharged, 6-cylinders, diameter 140mm or 121mm.

Rated speed 

2100 RPM

Flywheel power

169 kW

Start mode

24V electric starting

Torque converter

Torque converter used in SD7 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, and multi-disc clutch. The braking clutch is pressed by spring, separated hydraulic, 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 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.

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 converter outlet, filter and lines.

Main pump

Gear pump

Oil flow


Working pressure  


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 back side. 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 


System working pressure 


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  


Water tank of cooling system   


Camshaft box of the engine


Bevel gear case   


Implement oil tank  


Pivot lubricating tank 


Final drive      


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