DOZER EQUIPMENT
DIMENSIONS
HYDRAULIC SYSTEM
1110
S
PECIFICATIONS
D155AX
-6
CRAWLER DOZER
D155AX-6 C RAWLER D OZER
STEERING SYSTEM
PCCS lever controls for all directional movements. Pushing the
PCCS lever forward results in forward machine travel, while pulling it
rearward reverses the machine. Simply tilt the PCCS lever to the left
to make a left turn. Tilt it to the right for a right turn.
Hydrostatic steering system (HSS) is powered by steering planetary
units and an independent hydraulic pump and motor. Counter-
rotation turns are also available. Wet, multiple-disc, pedal-controlled
service brakes are spring-actuated and hydraulically released.
Gearshift lock lever also applies parking brakes.
Minimum turning radius. . . . . . . . . . . . . . . . . . . . . . . . . . 2.14 m 7'0"
UNDERCARRIAGE
Suspension. . . . . . . . . . . . . . . . . . Oscillation-type with equalizer bar
and forward mounted pivot shafts
Tr ack roller frame . . . . . . . . . . . . . . . . . . . . Monocoque, high-tensile-
strength steel construction
K-Bogie undercarriage
Lubricated track rollers are resiliently mounted the track frame with
a bogie suspension system whose oscillating motion is cushioned
by rubber pads.
Tr ack shoes
Lubricated tracks. Unique dust seals for preventing entry of foreign
abrasives into pin-to-bushing clearance for extended service. Track
tension easily adjusted with grease gun.
Number of shoes (each side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Grouser height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 mm 3.1"
Shoe width (standard/maximum) . . . . . . . . 560 mm 22"/710 mm 28"
Ground contact area . . . . . . . . . . . . . . . . . . . . . 36680 cm
2
5,685 in
2
Ground pressure (tractor only) . . . . . . 82.4 kPa 0.84 kg/cm
2
11.9 psi
Number of track rollers (each side) . . . . . . . . . . . . . . . . . . . . . . . . . 7
Number of carrier rollers (each side) . . . . . . . . . . . . . . . . . . . . . . . . 2
COOLANT AND LUBRICANT
CAPACITY (REFILL)
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625 ltr 165 U.S. gal
Coolant. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 ltr 21.7 U.S. gal
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ltr 9.8 U.S. gal
Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 ltr 0.4 U.S. gal
Tr ansmission, bevel gear
and steering system . . . . . . . . . . . . . . . . . . . 90 ltr 23.8 U.S. gal
Final drive (each side). . . . . . . . . . . . . . . . . . . . 31 ltr 8.2 U.S. gal
OPERATING WEIGHT
Tr actor weight. . . . . . . . . . . . . . . . . . . . . . . . . . . 31000 kg 68,350 lb
Including rated capacity of lubricant, coolant, full fuel tank,
operator and standard equipment
Operating weight . . . . . . . . . . . . . . . . . . . . . . . .
39500 kg 87,100 lb
Including strengthened SIGMADOZER, giant ripper, ROPS cab,
operator, standard equipment, rated capacity of lubricant, coolant,
and full fuel tank.
Ground pressure . . . . . . . . . . . . . . .
106 kPa 1.08 kg/cm
2
15.4 psi
FINAL DRIVES
Double-reduction, spur and planetary final drives increase tractive
effort. Segmented sprockets are bolt-on for easy in-the-field
replacement.
D155AX-6
Power Shift
DRAWBAR PULL VS. SPEED.
MAXIMUM USABLE PULL
DEPENDS ON TRACTION AND
WEIGHT OF TRACTOR INCLUDING
MOUNTED EQUIPMENT.
Travel speed Forward Reverse
1st 3.8 km/h 2.4 mph 4.6 km/h 2.9 mph
2nd 5.6 km/h 3.5 mph 6.8 km/h 4.2 mph
3rd L 7.5 km/h 4.7 mph 9.2 km/h 5.7 mph
3rd 11.6 km/h 7.2 mph 14.0 km/h 8.7 mph
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SAA6D140E-5
Type. . . . . . . . . . . . . . . . . . . . . 4-cycle, water-cooled, direct injection
Aspiration. . . . . . . . Turbocharged, air-to-air aftercooled, cooled EGR
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore x stroke . . . . . . . . . . . . . . . . . 140 mm x 165 mm 5.51" x 6.50"
Piston displacement. . . . . . . . . . . . . . . . . . . . . . . . . 15.24 ltr 930 in
3
Governor . . . . . . . . . . . . . . . . . . All-speed and mid-range, electronic
Horsepower
SAE J1995 . . . . . . . . . . . . . . . . . . . . . . . . . Gross 268kW 360HP
ISO 9249 / SAE J1349* . . . . . . . . . . . . . . . . . . Net 264kW 354HP
Rated rpm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1900rpm
Fan drive type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic
Lubrication system
Method . . . . . . . . . . . . . . . . . . . . . . . Gear pump, force lubrication
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Full-flow
*Net horsepower at the maximum speed of
radiator cooling fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
239kW 320HP
TORQFLOW TRANSMISSION
Komatsu’s automatic 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 prevent
machine from accidental starts.
Overall length Blade Blade Maximum lift Maximum drop Maximum tilt Additional
with dozer capacity length x height above ground below ground adjustment weight
SIGMADOZER
6125 mm 9.4 m
3
4060 mm x 1850 mm 1320 mm 617 mm 920 mm 4940 kg
20'1" 12.3 yd
3
13'4" x 6'1" 4'4" 2' 3' 10,890 lb
Strengthened 6125 mm 9.4 m
3
4060 mm x 1850 mm 1320 mm 617 mm 920 mm 5360 kg
SIGMADOZER 20'1" 12.3 yd
3
13'4" x 6'1" 4'4" 2' 3' 11,820 lb
Semi-U 6175 mm 9.4 m
3
4130 mm x 1790 mm 1255 mm 593 mm 953 mm 4960 kg
Tilt Dozer 20'3" 12.3 yd
3
13'7" x 5'10" 4'1" 1'11" 3' 10,936 lb
Full-U 6590 mm 11.9 m
3
4225 mm x 1790 mm 1255 mm 593 mm 970 mm 5630 kg
Tilt Dozer 21'7" 15.6 yd
3
13'10" x 5'10" 4'1" 1'11" 3'2" 12,420 lb
Angle 6743 mm 4.6 m
3
4850 mm x 1205 mm 1562 mm 664 mm 520 mm 5170 kg
Dozer 22'1" 6.0 yd
3
15'11" x 3'11" 5'1" 2'2" 1'8" 11,400 lb
Number of cylinders Bore
Blade Lift 2 110 mm 4.33"
Blade Tilt 1 160 mm 6.30"
Ripper Lift 1 180 mm 7.09"
Ripper Tilt 1 200 mm 7.87"
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
325 ltr/min 85.9 U.S. gal/min for steering and 180 ltr/min 47.6 U.S.
gal/min for imlement at rated engine rpm.
Relief valve setting . . . for implement 27.5 MPa 280 kg/cm
2
3,980 psi
. . . . . for steering 38.2 MPa 390 kg/cm
2
5,550 psi
Control valves:
Spool control valve for SIGMADOZER, Semi-U tilt dozer and Full-U
tilt dozer.
Positions: 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.
Positions: Ripper lift . . . . . . . . . . . . . . . . . . Raise, hold, and lower
Ripper tilt . . . . . . . . . . . . . Increase, hold, and decrease
Hydraulic cylinders . . . . . . . . . . . . . . . . . . . . . . Double-acting, piston
Hydraulic oil capacity (refill):
Semi-U tilt dozer . . . . . . . . . . . . . . . . . . . . . .
85 ltr 22.5 U.S. gal
U-tilt dozer . . . . . . . . . . . . . . . . . . . . . . . . . . 85 ltr 22.5 U.S. gal
Ripper equipment (additional volume):
Multi-shank ripper . . . . . . . . . . . . . . . . . . . . 37 ltr 9.8 U.S. gal
Giant ripper . . . . . . . . . . . . . . . . . . . . . . . . . 37 ltr 9.8 U.S. gal
Use of high-tensile-strength steel in moldboard for strengthened blade construction. Blade tilt hose piping is mounted inside the dozer
push arm to protect from damage.
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