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Earth Moving Machinery → Bulldozer


SD7 bulldozer are 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.

SD7-220 horsepower, elevated sprocket bulldozer integrate modern secience into it, its new structure, good performance, high working efficiency, safety and comfortable operation condition, realiable entire quality, excellent service is your wise choosing.

Main specifications

Operating weight(not including ripper)        23800 ㎏

Ripper weight                            3900   ㎏

Engine flywheel power                    162 k W

Ground pressure(without ripper)            71.9 kPa

Ground clearance                        404 mm

Ground contact length                     2890 mm

Track center distance                      1980 mm

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                      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 )    350m 3 /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 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 , multi-disc clutch. The braking clutch is pressed by spring, separated hydraulicly, 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 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 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                      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)


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

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

Blade type

Track ground contact length(A)

Length of machine


Blade height


Overall height


Blade width


Track center distance(F)

Digging depth

Lifting height

Blade capacity

Straight tilting blade










Coal pushing blade










Angle blade










LGP blade









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