Komatsu Bulldozers D275A-5 shop manual

Komatsu Bulldozers D275A-5 shop manual

Full Specs

Model Komatsu S6D170-4
Type 4-stroke cycle, water-cooled, direct injection
Aspiration Turbocharged, and emission certified diesel
Bore x stroke 170 mm x 170 mm
Piston displacement 23,15 l
Flywheel horsepower @ 1800 rpm (SAE J1349) 301 kW
Fuel system Direct injection
Governor All-speed mechanical
Lubrication system Force-lubrication driven by gear pump. Full flow, dry-type air cleaner with automatic dust evacuator and dust indicator
Starter motor 7,5 kW x 2
Alternator 24 V/50
Battery 2 x 12 V/170 Ah

Komatsu’s TORQFLOW transmission consists of a water-cooled, 3-element, 1-stage, 1-phase torque converter and a planetary gear, multiple-disc clutch transmission which is hydraulically actuated and force-lubricated for optimum heat dissipation. Joystick control of gears (3 froward and 3 reverse) and directional and steering changes. Gearshift lock lever and neutral safety switch prevent machine from accidental starts.
Travel speed
1st forward 0-3,8 km/h
1st reverse 0-4,9 km/h
2nd forward 0-6,7 km/h
2nd reverse 0-8,7 km/h
3rd forward 0-11,8 km/h
3rd reverse 0-14,9 km/h

Drive System
Double-reduction , spur and planetary final drives increase tractive effort. Segmented sprockets are bolt on for easy in-the-field replacement.

Hydrostatic Steering System (HSS) is powered by steering planetary units and an independent hydraulic pump and motor. Counterrotation turns are also available. Wet, multiple-disc, pedal-controlled service brakes are spring-actuated and hydraulically released. Gearshift lock lever also applies service brakes.
Joystick controls for all directional movements. Pushing the joystick forward results in forward machine travel, while pulling it rearward reverses the machine. Simply tilt the joystick to the left to make a left turn. Tilt it to the right for a right turn.
Minimum turning radius 3,9 m
(as measured by track marks on ground)

Suspension Oscillating equalizer bar and pivot shaft
Track roller frame Cylindrical, high-tensile strength steel construction
Rollers and idlers Lubricated carrier/track rollers and idlers are sealed with floating seals
Number of carrier rollers (each side) 2
Number of track rollers (each side) 8
Track shoes Lubricated tracks. Extreme service shoes. Unique dust seals for preventing entry of foreign abrasives into pin-to-bushing clearances for extended service. Track tension easily adjusted with grease gun
Number of shoes (each side) 39
Grouser height 88 mm
Shoe width (standard) 610 mm
Ground contact area 42 090 cm²
Ground pressure (tractor) 0,88kg/cm²

Refilling capacity
Coolant 136 l
Fuel tank 840 l
Engine oil 51 l
Damper 2,1 l
Transmission, bevel gear and steering system 120 l
Final drive (each side) 43 l

Operating weight
Tractor weight, including rated capacity of lubricant, coolant, full fuel tank, operator and standard equipment
Operating weight, including dual tilt U-dozer, giant ripper, steel cab. ROPS canopy, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank
Tractor weight 37 200 kg
Operating weight 48 760 kg
Ground pressure 1,16 kg/m²

Hydraulic System
Closed-center load sensing system (CLSS) designed for precise and responsive control, and for efficient simultaneous operation.
Hydraulic control unit: All spool control valves externally mounted beside the hydraulic tank. Gear-type hydraulic pump with capacity (discharge flow) 255 ltr at rated engine rpm.
Relief valve setting 210 kg/cm²
Control valves Spool control valve for Semi-U tilt dozer and Full-U tilt dozer
Blade lift Raise, hold, lower, and float
Blade tilt Right, hold, and left
Additional control valve required for variable digging angle multi-shank ripper and giant ripper
Ripper lift Raise, hold, and lower
Ripper tilt Increase, hold, and decrease
Hydraulic cylinders Double-acting, piston
N° of cylinders – Bore
Blade lift 2 – 130 mm
Blade tilt 1 – 200 mm
Blade pitch 1 – 225 mm
Ripper lift 2 – 200 mm
Ripper tilt 2 – 200 mm
Semi-U tilt dozer 152 l
Ripper equipment (additional volume)
Giant ripper 48 l
Multi-shank ripper (variable) 48 l

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