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O
O
PERATOR
PERATOR
C
C
OMPARTMENT
OMPARTMENT
Operator's Compartment
All steering, direction, and speed changes can be made with a single joystick control.
When the operator wants to move the machine forward and to the left, he simply moves the
joystick forward and to the left. When he desires a gear change, he merely twists his wrist.
The machine responds to the movement of the lever, providing the operator with feeling of
natural control with Komatsu joystick.
Low-Noise Design
The engine, power train components, and
control valves are rubber-mounted to the
frame. A low-noise engine used and a
radiator mask which diverts the engine noise.
Engine side covers provide more than style
by damping engine noise.
Photo may include optional equipment
Photo may include optional equipment
4
S
'
'
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Easy-to-Operate Work Equipment
Control Lever
● A PPC valve is used with the right joystick
blade control. This improves operator com-
fort because of reduced operating effort
and stroke.
● 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 controll-
ability.
Hexagonal Pressurized Cab
(Optional)
Air filters and a higher internal air pressure
combine to prevent external dust from enter-
ing the cab. The cab's hexagonal design pro-
vides excellent front, side, and rear visibility.
The REU and the oil damper mount cab
soften shock for operator comfort and extend
components life.
Electronic Monitor Panel
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 easier, more precise reading.
● Electrical Charge Lamp
● Engine Air Intake Pre-heat Lamp
● Engine Coolant Temperature Caution Lamp
● Engine Coolant Temperature Gauge
● Engine Oil Pressure Caution Lamp
● Fuel Gauge
● Service Meter
● Monitor Caution Cancel Switch
● Monitor Caution Lamp
● Transmission Oil Temperature Gauge
Wet type multiple-disc steering
clutches/brakes
Wet type multiple-disc type steering clutches are controlled by left hand single-lever joystick.
Steering clutches are spring loaded and hydraulically released, eliminating clutch adjustment
for maintenance-free operation. Wet multiple-disc steering brakes are spring loaded and
hydraulically released, and interconnected with steering clutches for steep turn. Steering
brakes also function as service brakes with pedal operation.
Steering Functions
Forward and
reverse
Right and left
steering
First, to second,
to third shifting
Left Hand
Right Hand
D155A-5
CRAWLER DOZER
Photo may include optional equipment
Blade Functions
Ripper Functions
Lifting and
Forward
lowering
and rearward
Tilting
Raise and
lower
5
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