DOZER EQUIPMENT
DIMENSIONS
HYDRAULIC SYSTEM
11
10
S
PECIFICATIONS
D155AX
-6
CRAWLER DOZER
D155AX
-6
C
R A W L E R
D
O Z E R
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
Track 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.
Track 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
Transmission, 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
Tractor 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.
70
60
50
70
60
50
40
30
20
10
0
40
30
20
10
0
0
0
1
2
3
4
5
6
7
mph
Travel Speed
Dra
wbar Pull
2
4
6
8
10
12 km/h
US ton
ton
kN
400
500
600
300
200
100
0
F1
F2
F3
F3L
Manual
gearshift mode
Automatic
gearshift mode
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.
G.L
E
F
G
I
J
H
A
D
Ground clearance:
500 mm
1' 8"
B
C
A
4060 mm
13'4"
B
2140 mm
7'
C
3385 mm
11'1"
D
1850 mm
6'1"
E
3275 mm
10'9"
F
8225 mm
27'
G
2745 mm
9'
H
1240 mm
4'1"
I
950 mm
3'1"
J
3395 mm
11'2"
