Detailed Product Description

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

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.

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

 

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