SD7 Crawler Bulldozer

Bulldozer SPECIFICATIONS Main specifications Operating weight(not including ripper) 23800 Ripper weight 3900 Engine flywheel power 162kw Ground pressure(without ripper) 71.9kPa Ground clearance 404mm Ground contact length 2890mm Track center distance 1980mm 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) 350m3/h Diesel Engine Model NT855-C280 (Cummins) or C6121ZLG10 (Licensed CAT 3306 diesel engine) Type 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 160L/min Working pressure 3.1MPa 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 194L/min System working pressure 18.6MPa 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