Komatsu Technology
Komatsu develops and produces all major
components in house such as engines, elec-
tronics and hydraulic components.
Combining “Komatsu Technology”, and cus-
tomer feedback, Komatsu is achieving great
advancements in technology.
To achieve both high levels of productivity and
economical performance, Komatsu has devel-
oped the main components with a total control
system. The result is a new generation of high
performance and environment-friendly exca-
vators.
4
P
RODUCTIVITY &
E
COLOGY
F
EATURES
PC78US
-8
Electronic control
unit for engine
Hydraulic system
controller
Engine
Heavy duty HPCR (High Pressure
Common Rail) system
Hydraulic control valve
Main pump
Seven-inch TFT liquid crystal display
5
Low Emission Engine
Komatsu SAA4D95LE-5
is EPA Interim Tier 4
and EU Stage 3A
emissions certified.
Working Mode
Application
Advantage
Power mode
●
Maximum production/power
P
●
Fast cycle times
E
Economy
●
Good cycle times
mode
●
Better fuel economy
L
Lifting mode
●
Engine rpm reduction
Breaker
●
Optimum engine rpm,
B
mode
hydraulic flow
Attachment
●
Optimum engine rpm,
ATT
mode
hydraulic flow, 2way
Working Modes Selectable
The PC78US-8 excavator is equipped with five working
modes (P, E, L, B and ATT mode). Each mode is designed to
match engine speed and pump speed with the current appli-
cation. This provides the flexibility to match equipment
performance to the job at hand.
Eco-gauge that Assists Energy-saving Operations
The Eco-gauge on the right side of the multi-function color
monitor provides environment-
friendly energy-saving opera-
tion. Allows focus on operation
in the green range with
reduced CO
2
emissions and
efficient fuel consumption.
E
P
E mode
!"
P mode
L
L mode
B
B mode
ATT
ATT
ATT
ATT mode
Idling Caution
To prevent unnecessary fuel
consumption, an idling caution
is displayed on the monitor, if
the engine idles for 5 minutes
or more.
Low Operation Noise
Enables low noise operation using the low-noise engine and
methods to cut noise at source.
Electronically controlled common rail type engine
• Multi-staged injection
Low noise design
• Optimal arrangement of sound absorbing materials
• Partition between the cab and engine room
Tight Tail Swing
The narrow swing area is well suited for operation in
confined areas with only a
80mm
(3.1") protrusion over
the tracks.
Advantage even in Confined Job Site
Road & bridge work
2990mm
9.3''
3.1''
2990mm
1750mm
1240mm
Short swing radius
High Mobility
The PC78US-8 exceptional travel performance is provided by
large drawbar pull and single pump with double flow, and it
demonstrates superb maneuverability while operating at its
optimum travel speed. It exhibits a large drawbar pull for moving
on job sites, traveling in rough terrain and climbing steep slopes.
Maximum drawbar pull: 66.9 kN
6820 kgf 15050 lb
Two Automatic Travel Speeds
High or low–whichever speed suits the ground and job condi-
tions–can be selected with one touch. As terrain changes,
travel speed will automatically shift up or down within the
selected speed range.
Auto-decel
Engine speed automatically slows down when all control
levers are set in neutral to minimize fuel consumption.
COMPACT HYDRAULIC EXCAVATOR
PC78US
-8
C
O M P A C T
H
Y D R A U L I C
E
X C A V A T O R
Photo may include optional equipment.
