SD7N Bulldozer

SD7N bulldozer is 248 horsepower track-type dozer with elevated sprocket, power shift drive, semi-rigid suspended and pilot hydraulic control. It is a medium size bulldozer weighing approx. 23tons integrated with modular design making it easy for repair & maintenance. It relieves oil with difference pressure, the hydraulic system performs protecting environment and save energy with high working efficiency. SD7N Bulldozer is equivalent to Caterpillar Bulldozer D6R, Komatsu D85, BEML BD85. The elevated sprocket design of the Sd7n Dozer offers better and much smoother operator sight line and view control, thus results in outstanding machine efficiency along with better operator comfort.

  • Engine - Chongqing Cummins NT855-C280S10
  • Engine Rated Power(185 KW/248 HP)
  • Operating weight 23, 800 Kg (without Ripper)
  • Pilot joy stick hydraulic control
  • Elevated sprocket
  • ROPS cabin & LED Lights


MakeChongqing Cummins
ModelChongqing Cummins NT855-C280S10
TypeMechanical injector
Cooling System TypeWater cooled
Turbo chargedYes
Rated Power (KW/HP)185/248
Rated Revolution (rpm)2100
Maximum Torque (N.m/rpm)1097/1500
No. of cylinders6
Bore x Stroke ( mm)140 x 152
Displacement14 L
Fan Drive typeMechanical
Min ground clearance(mm)404
Compression rate14.5 : 1
Fuel filter2
Fuel System TypeChongqing Cummins type, mechanical control fuel injection
Alternator24V / 50A
Starting motor8.5 KW
Battery Rating2 x 12V, 120 Ah
LED LightsYes
Power Train 
Torque convertor / ClutchTorque Convertor
TypePower separating hydraulic mechanical type
Transmission/Gear BoxTransmission Type
Type / ModelPower shift planetary transmission with 3 speeds forward and 3 speed reverse, speed and direction can be quickly shifted
No. of gear forward3
No. of gear backward3
Max forward speed10.9
Max reverse speed13.2
Maximum drawbar pull1st gear - 196.8 KN 2nd gear - 172.2 KN
Hydraulic System 
Operation typePilot hydraulic control
Hydraulic pump 
TypeGears oil pump
Capacity / Discharge170 (L/min)
Relief pressure / Max pressure20 Mpa
Hydraulic cylinders 
TypeDouble acting piston type
Blade jack lift (No. of cylinders/bore x stroke)2 / 105 x 1308
Blade tilt (No. of cylinders/bore x stroke)1 / 165.1 x 155
Ripper : (No. of cylinders /Bore x Stroke (mm))Ripper : 2 / (150 x 480)
Control Valves TypePilot operated with joystick control
TypeThe steering clutch is hydraulic pressed usually separated clutch
Steering ControlHydraulically operated
Under Carriage 
Track gauge (mm) / Track pitch1980
Track rollers (each side)7
Carrier rollers (each side)1
Track shoes (each side)40
Shoe width (mm)560 / 610 (Optional)
Ground pressure71.9 Kpa including ripper and blade
No. of idler (each side)2
EngineReplaceable cartridge filter
TransmissionOne magnetic oil strainer and replaceable element by-pass filter
Steering & BrakingOne magnetic oil strainer and replaceable element by-pass filter
Hydraulic SystemReturn filter
Operating Mass 
Operating mass (kg) (approx.)without ripper - 23800
Blade Specifications - General 
BLADE ATTACHMENT 1 - Standard MachineTilt Semi U blade
Overall length with dozer5667 With ripper - 7616
Max. lift above ground / height (mm)1115
Max. drop below ground/ Max digging depth498
Blade / Dozing Capacity(Cum)8.4
Mass in (kg) Dozer Blade attachment / Dozing weight3428 kg
Blade width (mm)3500
Blade height (mm)1130
BLADE ATTACHMENT (Optional blade)Coal blade - U type
Overall length with dozer5667.0
Max. lift above ground / Max lifting height (mm)1115.0
Max. drop below ground / Maximum digging depth670.0
Blade / Dozing Capacity(Cum)9.6
Mass in (kg) Dozer Blade attachment / Dozing weight3920.0
Blade width (mm)4428.0
Blade height (mm)1350.0
TypeThe braking clutch is pressed by spring, separated hydraulic, meshed type Wet banding structure
Control / Actuation typefoot brake, hydraulic booster
CABINSealed cabin with air conditioner (optional) with ROPS
INSTRUMENTATIONHour meter, fuel gauge, temperature gauge, battery charge indicator, horn, oil pressure gauge, front light, rear lights, plough lights, indicator lights


Sd7n Bulldozer
sd7n New bulldozer
sd7n bulldozer new
SD7N with Ripper

Optional Attachment 

1). Stage III engine
2). Air conditioner
3). U blade (Coal blade)
4). 3 shank ripper
5). Single shank ripper
6). Solid waste blade
7). Special machine for solid waste with broad 910mm triangular track plates