Page 1
OPTIONAL EQUIPMENT
STANDARD EQUIPMENT FOR BASE MACHINE
CRAWLER DOZER
Photo may include optional equipment.
www.Komatsu.com Printed in Japan 200706 IP.AD (10)
CEN00250-00
Materials and specifications are subject to change without notice.
is a trademark of Komatsu Ltd. Japan.
HORSEPOWER
Gross: 130 kW
175 HP @ 1850 rpm
Net: 116 kW 155 HP @ 1850 rpm
OPERATING WEIGHT
16650 kg
36,710 lb
D
68ESS
D68ESS-12
● Air cleaner, double element with
dust indicator
● Alternator, 35 ampere/24V
● Batteries, 112 Ah/2 x 12V
● Blower cooling fan
● Decelerator pedal
● Engine hood
● Engine side covers, gull-wing
● Fenders
● Lighting system, (includes 2 front, 1 rear)
● Locks, filler caps and covers
● Mono-lever steering
● Muffler with curved exhaust pipe
● Radiator guard door, flat
● Radiator reserve tank
● Rear cover
● ROPS mounting brackets
● Starting motor, 7.5 kW/24V
● Seat, adjustable
● Tr ack roller guard, end sections
● Tr ack shoe assembly
—Heavy-Duty sealed and lubricated track
● 560 mm 22" single grouser shoe
● Underguards, oil pan and transmission
● Wet, multiple-disc steering clutch/blake
● AR track assembly
(abrasion resistant bushings)
● Backup alarm
● Electronic instrument monitor panel
● Front pull hook
● Hitch type drawbar
● High mount foot rests
● Pressure check ports for power train
● Radiator core protective grid
● Rigid type drawbar
● Underguard, heavy-duty
● 7 track roller
SHOES
Shoe Additional weight
Ground contact
area
610 mm 24.0"
+110 kg 32635 cm
2
single-grouser
+240 lb 5,058 in
2
shoe
ROPS CANOPY (without cab)
● Additional weight 340 kg 750 lb
● Meets ISO 3471 SAE J/ISO3471 ROPS
standards, and ISO 3449 FOPS
standard.
● Roof dimensions:
—Length: 1830 mm 6'0"
—Width: 1600 mm 5'3"
—Height from operator compartment
floor: 1705 mm 5'7"
MULTI-SHANK RIPPER
● Additional weight (including hydraulic
control unit): 1645 kg 3,630 lb
● Beam length: 2170 mm 7'1"
●
Maximum digging depth: 665 mm 2'2"
●
Maximum lift above ground: 565 mm 1'10"
STEEL CAB
● Additional weight 285 kg 630 lb
● All-weather, enclosed pressurized cab
● Dimensions:
—Length: 1765 mm 5'9"
—Width: 1720 mm 5'8"
—Height: 1625 mm 5'4"
—Height from floor to ceiling:
1515 mm 5'0"
ROPS CANOPY FOR CAB
● Additional weight 250 kg 550 lb
● Meets ISO 3471, SAE J/ISO 3471 ROPS
standards, and ISO 3449 FOPS
standard.
● Roof dimensions:
—Length: 1270 mm 4'2"
—Width: 1490 mm 4'11"
—Height from operator compartment
floor: 1705 mm 5'7"
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HORSEPOWER
Gross: 130 kW 175 HP @ 1850 rpm
Net: 116 kW 155 HP @ 1850 rpm
OPERATING WEIGHT
16650 kg 36,710 lb
BLADE CAPACITY
Straight Tilt Dozer:
3.0 m33.9 yd
3
Mecanical Angle Dozer:
2.6 m33.4 yd
3
32
Photo may include optional equipment.
W
ALK
-A
ROUND
D68ESS
CRAWLER DOZER
D68ESS-12 C RAWLER D OZER
Electronic monitoring system prevents
minor problems from developing into major ones.
Wet, multiple-disc brakes
eliminates brake-band adjustments
for maintenance-free operation.
Modular power train for increased
serviceability and durability.
Bolt-on segmented sprocket teeth
for easy in-the-field replacement
Gull-wing engine side covers
for easy and safer servicing.
The Komatsu S6D114E-1A diesel engine
provides an output of 116 kW 155 HP with excellent
productivity.
High capacity
Straight tilt dozer,
Mechanical angle dozer
combined the highest power in its class
with outstanding productivity.
Komatsu torqflow transmission
offers single lever control of speed (3 forward
and 3 reverse) and directional changes.
Forward mounted
pivot shafts
isolate final drives from blade loads.
Left hand
joystick controls all
tractor motion. Right hand joystick
controls all blade movements.
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4 5
OPERATOR’S COMPARTMENT
D68ESS
CRAWLER DOZER
D68ESS-12 C RAWLER D OZER
Electronic monitoring system
An electronic monitoring system prevents minor problems
from developing into major ones. All meters and gauges are
controlled by a microcomputer, which provides a wide
indication range for an easier, more precise reading.
Easy-to-operate work equipment control lever
With the Closed-center Load Sensing (CLSS) hydraulic
system, blade lever stroke is directly proportional with blade
speed, regardless of the load and travel speed. This results in
superb, fine controllability.
Benefits of CLSS
● More precise and responsive operation due to the pressure
compensation valve.
● Reduced fuel consumption by discharging only the required
amount of oil from the pump.
● The work equipment moves smoothly for operations such
as side-cutting even when priority is given to steering.
Low-noise design
For smoother riding comfort, power train components and
hydraulic control valves are mounted to the frame with
rubber pads to soften vibration and shut out noise.
Since the D68ESS employs joysticks, the walk-through
operator compartment is uncluttered for smooth entry
and exit. An adjustable seat with backrest is standard
equipment.
Three-stage height adjustable armrests
Three-stage height adjustable arm rests and relocated fuel
control lever provide
comfortable operation and
increased leg space.
All steering, direction, and speed changes are made by a left-hand single joystick control. If the operator wants to
move the machine forward and to the left, he simply moves the joystick forward and to the left. If he desires a gear change,
he merely twists his wrist. The machine responds to the movement of the lever providing the operator with the feeling of
natural control with Komatsu’s joystick.
Cylinder
Unload
valve
Tank
Cylinder
Unload
valve
Tank
PPC
PPC
CLSS for D68ESS-12
Forward and reverse
Right and left steering
First, to second, to third shifting
Lifting and lowering
Tilting
Lifting and lowering
Photo may include optional equipment.
RELIABILITY FEATURES
E
ASY
M
AINTENANCE
Field-proven engine
Powerful S6D114E-1A diesel engines provides a massive
output of
116 kW 155 HP. The engine power is transmitted
smoothly to the final drives via a high-efficiency torque
converter.
Modular designed power train units
The modular design allows easy removal and installation of
any individual unit for shorter downtime.
Flat bottom frame
A flat bottom frame, the monocoque track frames and
forward-mounted pivot shafts provide good maneuverability in
muddy terrain by preventing mud from building up under the
frame.
Wet, multiple-disc brakes
Eliminate brake-band
adjustments for
maintenance-free operation.
Coolant reservoir
A radiator coolant reservoir makes it easier to check the
coolant level and eliminates frequent refilling.
Oil pressure check ports
Oil pressure check ports for the
power train are centralized on
the right hand side of the
operator
Gull-wing engine side covers
A gas-spring cylinder opens the gull-wing engine side covers
widely, allowing the engine and auxiliary components to be
easily checked.
Sturdy design
Because fewer components mean greater reliability, we’ve
designed a simple hull frame made of a thick, single plate.
Tr ack frames have a large-section construction for maximum
rigidity. Even the box-section construction of the blade back
beam is reinforced, all with durability in mind.
Front radiator mask
Openable and closable radiator mask facilitates radiator
cleaning.
Steering functions (left hand)
Blade functions (right hand)
Straight tilt dozer Mechanical angle dozer
Engine assembly
Hull frame
Transmission
assembly
Steering case assembly
Pivot shaft
Tra c k frame
Final drive
assembly
Shoe
Page 4
76
S
PECIFICATIONS
D68ESS
D68ESS-12 C RAWLER D OZER
CRAWLER DOZER
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu S6D114E-1A
Type . . . . . . . . . . . . . . . 4-stroke cycle, water-cooled, direct injection
Aspiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Turbocharged
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore x stroke. . . . . . . . . . . . . . . . . 114 mm x 135 mm 4.49" x 5.31"
Piston displacement . . . . . . . . . . . . . . . . . . . . . . . . . 8.27 ltr 5.05 in
3
Governor . . . . . . . . . . . . . . . . . . . . . . . . . . . . All-speed, Mechanical
Horsepower
SAE J1995 . . . . . . . . . . . . . . . . . . . . . . . . . Gross 130kW 175HP
ISO 9249 / SAE J1349 . . . . . . . . . . . . . . . . . . Net 116kW 155HP
Rated rpm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1850rpm
Fan drive type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical
Lubrication system
Method . . . . . . . . . . . . . . . . . . . . . . Gear pump, forced lubrication
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Full-flow
Net maximum torque. . . . . . 824 N•m 84 kg•m 608 lb ft @ 1300 rpm
TORQFLOW TRANSMISSION
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 forward and 3 reverse) and directional steering changes.
Gearshift lock lever and neutral safety switch prevent machine
from accidental starts.
Travel speed Forward Reverse
1st 0–3.4 km/h 0–2.1 mph 0–4.4 km/h 0–2.7 mph
2nd 0–5.8 km/h 0–3.6 mph 0–7.5 km/h 0–4.7 mph
3rd 0–9.0 km/h 0–5.6 mph 0–11.0 km/h 0–6.8 mph
30
20
10
0
36
30
20
10
0
0
01234567 mph
Tra vel Speed
Drawbar Pull
246810 12 km/h
US ton tonkN
300
200
100
0
40
F1
F3
F2
D68ESS-12
Power Shift
DRAWBAR PULL VS. SPEED.
MAXIMUM USABLE PULL
DEPENDS ON TRACTION AND
WEIGHT OF TRACTOR
INCLUDING MOUNTED
EQUIPMENT.
FINAL DRIVES
Double-reduction final drives of spur gear and planetary gears to
minimize transmission of shocks to power train components.
Segmented sprocket are bolt-on for easy in-the-field replacement.
COOLANT AND LUBRICANT
CAPACITY (
REFILL)
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315 ltr 83.3 U.S. gal
Coolant. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 ltr 11.6 U.S. gal
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19 ltr 5.0 U.S. gal
Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 ltr 0.3 U.S. gal
Tr ansmission, bevel gear,
and steering system . . . . . . . . . . . . . . . . . . .
44 ltr 11.6 U.S. gal
Final drive (each side) . . . . . . . . . . . . . . . . . .
28.5 ltr 7.5 U.S. gal
STEERING SYSTEM
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.
Wet, multiple-disc steering clutches are hydraulically loaded and
hydraulically released. Wet, multiple-disc pedal-controlled steering
brakes are spring-actuated and hydraulically released.
Steering brakes also function as service and parking brakes.
Minimum turning radius*:. . . . . . . . . . . . . . . . . . . . . . . . . 3.2 m 10'6"
*As measured by track marks on ground.
UNDERCARRIAGE
Suspension . . . . . . . . . . . . . . . . . . . . . Oscillation with equalizer bar
and forward mounted pivot shafts
Tr ack roller frame . . . . . . . . . . . . . . . . . . . Monocoque, large section,
durable construction
Tr ack shoes. . . . . . . . . . . . . . . . Lubricated tracks. Unique dust seals
for preventing entry of foreign abrasives into
pin-to-bushing clearances for extended service.
Tr ack tension is easily adjusted with a grease gun.
Number of carrier rollers (each side) . . . . . . . . . . . . . . . . . . . . . . . . 2
Number of track rollers (each side) . . . . . . . . . . . . . . . . . . . . . . . . . 6
Number of shoes (each side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Grouser height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 mm 2.6"
Shoe width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 560 mm 22"
Tr ack gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1925 mm 6'4"
Length of track on ground. . . . . . . . . . . . . . . . . . . . . . . 2725 m 8'11"
Ground contact area . . . . . . . . . . . . . . . . . . . . . 30520 cm24,730 in
2
Ground pressure . . . . . . . . . . . . . . . . 53.9 kPa 0. 55 kg/cm27.82 psi
OPERATING WEIGHT (APPROXIMATE)
Tractor weight:
Including rated capacity of lubricant, coolant, full fuel tank, operator
and standard equipment. . . . . . . . . . . . . . . . . . . 14640 kg 32,280 lb
Operating weight:
Including straight tilt dozer, cab, operator, standard equipment, and
rated capacity of lubricants, coolant, and full fuel tank
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16650 kg 36,710 lb
HYDRAULIC SYSTEM
Closed-center load sensing system (CLSS) designed for precise
and responsive control, and for efficient simultaneous operation.
Hydraulic control units:
All spool control valves externally mounted beside the hydraulic tank.
Type of pump:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gear pump
Capacity (discharge flow at rated engine rpm):
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 134 ltr/min 35.4 U.S. gal/min
Relief valve setting . . . . . . . . . . . . . . 20.6 MPa 210 kg/cm22,990 psi
Hydraulic cylinders . . . . . . . . . . . . . . . . . . . . . . Double-acting, piston
Control valves:
Spool control valve for mechanical angle power tilt dozer.
Positions: Blade lift . . . . . . . . . . . . . . . Raise, hold, lower, and float
Blade tilt . . . . . . . . . . . . . . . . . . . . . Right, hold, and left
Additional control valve for multi-shank ripper
Positions:Ripper lift. . . . . . . . . . . . . . . . . . . Raise, hold, and lower
Hydraulic oil capacity (refilling):
Straight tilt dozer. . . . . . . . . . . . . . . . . . . . . .
48.0 ltr 12.7 U.S. gal
Number of cylinders Bore
Blade lift 2 110 mm 4.33"
Blade tilt 1 140 mm 5.51"
Remarks: * Blade capacities are based on the SAE recommendation practice J1265.
DOZER EQUIPMENT
Use of high tensile strength steel in moldboard for strengthened blade construction.
Overall length Blade Blade Maximum lift Maximum drop Maximum tilt Angling Additional
with dozer capacity* length x height above ground below ground adjustment angle weight
Straight Tilt Dozer
5053 mm 3.0 m33200 mm x 1100 mm 1005 mm 460 mm 600 mm 1770 kg
16'6" 3.9 yd
3
10'6" x 3'7" 3'4" 1'6" 2'
–
3,900 lb
Mechanical Angle 5413 mm 2.6 m
3
3980 mm x 950 mm 1130 mm 540 mm 200 mm 2710 kg
Dozer 17'9" 3.4 yd
3
13'1" x 3'1" 3'8" 1'9" 8"
25 degree
5,980 lb
DIMENSIONS
Ground clearance . . . . . . . . . . .390 mm 1'3"
A 1925 mm 6'4" H 2725 mm 8'11"
B 3200 mm 10'6" I 5070 mm 16'8"
C 290 mm 11" J 65 mm 2.6"
D 600 mm 2'0" K 505 mm 1'8"
E 2770 mm 9'1" L 3025 mm 9'10"
F 1005 mm 3'4" M 3140 mm 10'4"
G 460 mm 1'6"
Dimension with straight tilt dozer.
A
D
C
E
F
G
J
K
L
M
I
H
G.L.
B
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