Komatsu D375A-6 LARGE DOZERS
Product Feature
Automatic Torque Converter Lockup System
For greater efficiency during long pushes, the lockup mode allows the system to automatically engage the torque converter lockup clutch. Locking up the torque converter transmits all the engine power directly to the transmission, increasing ground speed and thus achieving efficiencies equal to a direct drive. The results of this efficient use of engine power are less fuel consumption and faster cycle times.
Effect of ECMV Steering Clutches/Brake Control
When dozing downhill, ECMV automatically controls steering clutches and brakes depending on incline of machine or degree of load, reducing counter-steering and producing smooth dozing operation.
When dozing and turning, ECMV automatically controls stroke ratio of steering clutches and brakes depending on degree of load, enabling smooth dozing and turning.
Electronic Controlled Modulation Valve (ECMV)
Transmission
The controller automatically adjusts each clutch engagement depending on travel conditions such as gear speed, RPM and shifting pattern. This provides shockless and smooth clutch engagement, improved component reliability, extended component life, and operator ride comfort.
Steering Clutches/Brakes
Sensors monitor machine operating conditions and electronically control the steering clutches and brakes. Monitoring application parameters such as incline angle of slope and degree of load provides smooth and easy operation by reducing counter-steering on downhill travel, etc.
Fully Adjustable Air Suspension Seat and Travel Control Console
For improved rear visibility during the return portion of the cycle, the operator can adjust the seat 15° to the right. The transmission and steering controls move with the seat for optimum operator comfort. The travel control console is adjustable fore, aft, and for height. The armrest is independently adjustable up and down, providing optimum operation posture for all operators. The operator seat is also tiltable for facilitating downhill dozing.
K-Bogie Undercarriage System
K-Bogies with front and rear single bogies are utilized to increase the length of track on ground improving machine stability and leveling performance. An oscillating idler and increased sprocket lead angle improve riding comfort when traveling over rough terrain. K-Bogies oscillate with two fulcrums assuring a large amount of track roller vertical travel. Impact load to undercarriage components is minimized and durability of components is improved since track rollers are always in contact with track links. Track rollers follow track link movement to extend the undercarriage life. Excellent riding comfort is provided due to less vibration and shock when traveling over rough terrain.
Palm Command Electronic Controlled Travel Control Joystick
Ergonomically designed palm command travel joystick provides the operator with a relaxed posture and superb control improving operator comfort. Transmission gear shifting is simply carried out with thumb push buttons.
Palm Command PPC Controlled Blade Control Joystick
The blade control joystick uses the Proportional Pressure Control (PPC) valve and joystick, similar to the travel control joystick. PPC control combined with the highly reliable Komatsu hydraulic system enables superb control. Dual tilt and pitch operation are enabled by pressing a switch with the thumb.
Track Link With Wedge Ring
New D375A-6 track links feature reduced press-fit force and a wedge ring. Conventional track pins are retained only with a large press-fit force. (The new track link divides pin forces between the wedge ring and press-fit force.) This enables easier service with reduced pin damage when turning pins and bushings. The result is improved undercarriage life and reduced maintenance cost through reduced wear, greater pin reusability, and reduced maintenance man-hours.
Track Shoe Slip Control Mode
Eliminates the need for the operator to constantly control engine power output with the decelerator pedal while ripping substantially reducing operator fatigue. Maneuverability is improved because the operator is free to focus on the ripping application without having to monitor the track shoe slippage. Repair costs are significantly lowered and undercarriage life is extended with the reduction in track shoe slippage. The track shoe slip control system will contribute to lower fuel costs because the engine output is automatically controlled to optimum levels for operation.
Working Mode
This mode can be set to either “P mode” for maximum production (power) or “E mode” for energy saving operation (economy). Combined with the automatic gearshift mode or manual gearshift mode, the working mode allows the operator to select the optimum machine operating condition for the work at hand. (The mode can be switched during operation.)
Specifications
Coolant and Lubricant Capacity (refill)
Fuel tank | 317.0 U.S. gal | 1200 ltr |
Coolant | 31.7 U.S. gal | 120 ltr |
Engine | 22.7 U.S. gal | 86 ltr |
Torque converter, transmission, bevel gear, and steering system | 39.6 U.S. gal | 150 ltr |
Final drive (each side) | 17.1 U.S. gal | 65 ltr |
Engine
Model | Komatsu SAA6D170E-5* | |
Type | 4-cycle, water-cooled, direct injection | |
Aspiration | Turbocharged, air-to-air aftercooled, cooled EGR | |
Number of cylinders | 6 | |
Bore x stroke | 6.69" x 6.69" | 170 mm x 170 mm |
Piston displacement | 1,413 in³ | 23.15 ltr |
Governor | All-speed and mid-range, electronic | |
Horsepower: | ||
SAE J1995 - Gross | 636 HP | 474 kW |
ISO 9249 / SAE J1349 - Net | 610 HP | 455 kW |
Hydraulic fan at maximum speed - Net | 580 HP | 433 kW |
Rated rpm | 1800 rpm | |
Fan drive type | Hydraulic | |
Lubrication system: | ||
Method | Gear pump, force lubrication | |
Filter | Full-flow |
Final Drive
Double-reduction final drive of spur and planetary gear sets to increase tractive effort and reduce gear tooth stresses for long final drive life. Segmented sprocket teeth are bolt-on for easy replacement.
Hydraulic System
Hydraulic control unit: | ||
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. Variable piston pump with capacity (discharge flow) of 366 ltr/min / 96.7 U.S. gal/min for implement at rated engine rpm. | ||
Relief valve setting . . . for implement | 3,980 psi | 27.5 MPa 280 kg/cm² |
Control valves: | ||
Spool control valves 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 |
Number of cylinders: | Bore: |
Blade lift | 2 | 5.5" / 140 mm |
Blade tilt | 1 | 7.1" / 180 mm |
Ripper lift | 2 | 7.9" / 200 mm |
Ripper tilt | 2 | 7.1" / 180 mm |
Hydraulic oil capacity (refill): | ||
Semi-U dozer or U dozer | 34.4 U.S. gal | 130 ltr |
Ripper equipment (additional volume): | ||
Giant ripper (variable) | 11.9 U.S. gal | 45 ltr |
Multi-shank ripper (variable) | 11.9 U.S. gal | 45 ltr |
Operating Weight
Tractor weight | 117,290 lb | 53200 kg |
Including rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment. | ||
Including Semi-U tilt dozer, giant ripper, cab, ROPS, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank. | 157,940 lb | 71640 kg |
Ground pressure | 21.0 psi | 1.48 kg/cm² / 145 kPa |
Steering System
PCCS, joystick controlled, wet multiple-disc steering clutches are spring-loaded and hydraulically released.Wet multiple-disc, pedal/lever controlled steering brakes are spring-actuated hydraulically released and require no adjustment. Steering clutches and brakes are interconnected for easy, responsive steering.
TORQFLOW Transmission
Komatsu TORQFLOW transmission consists of a water-cooled, 3-element, 1-stage, 1-phase torque converter with lockup clutch and a planetary gear, multiple-disc clutch transmission which is hydraulically actuated and force-lubricated for optimum heat dissipation. Gearshift lock lever and neutral safety switch help prevent accidental starts.
Product Parameter
Fuel tank | 317.0 U.S. gal | 1200 ltr |
Coolant | 31.7 U.S. gal | 120 ltr |
Engine | 22.7 U.S. gal | 86 ltr |
Torque converter, transmission, bevel gear, and steering system | 39.6 U.S. gal | 150 ltr |
Final drive (each side) | 17.1 U.S. gal | 65 ltr |
Model | Komatsu SAA6D170E-5* | |
Type | 4-cycle, water-cooled, direct injection | |
Aspiration | Turbocharged, air-to-air aftercooled, cooled EGR | |
Number of cylinders | 6 | |
Bore x stroke | 6.69" x 6.69" | 170 mm x 170 mm |
Piston displacement | 1,413 in³ | 23.15 ltr |
Governor | All-speed and mid-range, electronic | |
Horsepower: | ||
SAE J1995 - Gross | 636 HP | 474 kW |
ISO 9249 / SAE J1349 - Net | 610 HP | 455 kW |
Hydraulic fan at maximum speed - Net | 580 HP | 433 kW |
Rated rpm | 1800 rpm | |
Fan drive type | Hydraulic | |
Lubrication system: | ||
Method | Gear pump, force lubrication | |
Filter | Full-flow |
Hydraulic control unit: | ||
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. Variable piston pump with capacity (discharge flow) of 366 ltr/min / 96.7 U.S. gal/min for implement at rated engine rpm. | ||
Relief valve setting . . . for implement | 3,980 psi | 27.5 MPa 280 kg/cm² |
Control valves: | ||
Spool control valves 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 |
Number of cylinders: | Bore: |
Blade lift | 2 | 5.5" / 140 mm |
Blade tilt | 1 | 7.1" / 180 mm |
Ripper lift | 2 | 7.9" / 200 mm |
Ripper tilt | 2 | 7.1" / 180 mm |
Hydraulic oil capacity (refill): | ||
Semi-U dozer or U dozer | 34.4 U.S. gal | 130 ltr |
Ripper equipment (additional volume): | ||
Giant ripper (variable) | 11.9 U.S. gal | 45 ltr |
Multi-shank ripper (variable) | 11.9 U.S. gal | 45 ltr |
Tractor weight | 117,290 lb | 53200 kg |
Including rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment. | ||
Including Semi-U tilt dozer, giant ripper, cab, ROPS, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank. | 157,940 lb | 71640 kg |
Ground pressure | 21.0 psi | 1.48 kg/cm² / 145 kPa |
Minimum turning radius | 13'9" | 4.2 m |
Gear | Forward | Reverse |
1st | 2.2 mph 3.5 km/h | 2.9 mph 4.6 km/h |
2nd | 4.2 mph 6.8 km/h | 5.5 mph 8.9 km/h |
3rd L | 5.0 mph 8.0 km/h | 6.0 mph 9.7 km/h |
3rd | 7.3 mph 11.8 km/h | 9.8 mph 15.8 km/h |
Suspension | Oscillating equalizer bar and pivot shaft | |
Track roller frame | Cylindrical, high-tensile-strength steel construction | |
Rollers and idlers | Lubricated track rollers | |
K-Bogie undercarriage | Lubricated track rollers are resiliently mounted to the track frame with a bogie suspension system whose oscillating motion is cushioned by rubber pads. | |
Extreme service track shoes | Lubricated tracks. Unique seals prevent entry of foreign abrasives into pin to bushing clearances to provide extended service life. Track tension is easily adjusted with grease gun. | |
Number of shoes (each side) | 41 | |
Grouser height: | ||
Single grouser | 3.7" | 93 mm |
Shoe width (standard) | 24" | 610 mm |
Ground contact area | 7,527 in² | 48560 cm² |
Ground pressure (tractor) | 15.6 psi | 108 kPa / 1.10 kg/cm² |
Number of track rollers | 8 | |
Number of carrier rollers | 2 | |
Extreme service shoes: | Ground contact area: | Ground** pressure: |
24'' / 610 mm Additional weight - 0 lb / 0 kg |
7,527 in² 48560 cm² |
21.0 psi 1.48 kgf/cm² / 145 kPa |
28'' / 710 mm Additional weight - 1,500 lb / 680 kg |
8,760 in² 56520 cm² |
18.2 psi 1.28 kgf/cm² / 126 kPa |
32'' / 810 mm Additional weight - 3,000 lb / 1360 kg |
9,990 in² 64480 cm² |
16.0 psi 1.13 kgf/cm² / 111 kPa |
** Ground pressure based on tractor, Semi-U tilt dozer, giant ripper, cab, ROPS, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank. |