4
5
O
PERATOR
’
S
C
OMPARTMENT
D68ESS
CRAWLER DOZER
D68ESS-12
C
R A W L E R
D
O Z E R
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.
R
ELIABILITY
F
EATURES
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.
Track 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.
Engine assembly
Hull frame
Track frame
Shoe
Transmission
assembly
Steering case assembly
Final drive
assembly
Pivot shaft
Steering functions (left hand)
Blade functions (right hand)
Straight tilt dozer
Mechanical angle dozer