5
4
P
RODUCTIVITY &
E
COLOGY
F
EATURES
HYDRAULIC EXCAVATOR
PC850
-8
0
Working Mode
Application
Advantage
Power
●
Maximum production/power
P
Mode
●
Fast cycle time
E
Economy
●
Good cycle time
Mode
●
Good fuel economy
Working Mode Selection
Power and Economy Mode
The PC850-8 excavator is equipped with two working
modes. Each mode is designed to match engine flow, pump
speed, and system pressure to the current application, giving
the operator flexibility to match equipment performance to
the job at hand.
Environment-friendly Clean Engine Mounted
The PC850-8, which is equipped with the Komatsu
SAA6D140E-5 engine, meets the Tier 3 emission
regulations in North America (EPA) and EU Stage 3A.
The SAA6D140E-5 engine adopts the world’s first cooled
EGR system with electronically controlled bypass-assist type
venturi. NOx emission is reduced 40%, while maintaining
high power and low fuel consumption.
Electronically Controlled Variable Speed Fan
Contributes to Low Fuel Consumption and Low
Noise
The electronic control system sets
the rotational speed of the cooling fan
according to the coolant, hydraulic oil,
and ambient temperature; effectively
uses the engine output to prevent
wasteful fuel consumption; and
reduces noise during low-speed fan
rotation.
Lower and Economical Fuel
Consumption Using
Economy Mode
Enables operator to set the Eco
mode to up to four levels
according to working conditions
so that production requirement is
achieved at lowest possible fuel consumption.
Reduction of Ambient Noise (optional)
Reduced noise by adoption of an electronically controlled
variable speed fan drive, large hybrid fan, low-noise muffler
and cover with glasswool, to meet EU Stage 2 noise
regulations.
(E0,E1,E2,E3)
Pump for fan
Electronic control
unit for engine
Electronically controlled
variable speed fan
Hydraulic system
controller
LCD color monitor
Engine
Heavy duty HPCR (High Pressure
Common Rail) system
Electronically controlled cooled
EGR system
Hydraulic control valve
Main pump
Komatsu Technology
Komatsu develops and produces all major
components, such as engines, electronics
and hydraulic components, in house.
With this “Komatsu Technology,” and adding
customer feedback, Komatsu is achieving
great advancements in technology.
To achieve both high levels of productivity and
economical performance, Komatsu has
developed the main components with a total
control system. The result is a new generation
of high performance and environment friendly
excavators.
This is an image photo: may
differ from the actual engine.
Selection
ON
OFF
Result
Oil flow to the swing motor is increased.
180˚loading operations are most efficient.
Oil flow to the boom is increased.
90˚loading operations are most efficient.
Heavy Lift Mode
Gives the operator 10% more lifting force on the boom when
needed for handling rock or heavy lifting applications.
Swing Priority Setting
The swing priority setting allows the operator to use the same
easy motion for 180˚ loading as 90˚ loading operations. By
altering the oil flow, this setting allows you to select either
boom or swing as the priority for increased production.
Power Mode
Economy Mode
Heavy Lift Mode
Swing Priority Mode
Large Digging Force
Thanks to the high engine output and an excellent hydraulic
system, this machine demonstrates powerful digging force.
Maximum arm crowd force (ISO):
298 kN 30.4 ton
Maximum bucket digging force (ISO):
363 kN 37.0 ton
Work Equipment Speed Increased
An arm quick return circuit is provided for arm dumping. This
returns a portion of oil flow directly to the hydraulic tank at
arm dumping to reduce the hydraulic pressure loss.
Combined with increased bucket dumping speed, faster
loading work is realized.
Large Drawbar Pull and Steering Force
Since the machine has a large drawbar pull and a high
steering force, it demonstrates excellent mobility even when
it is being used on inclined sites.
Two-mode Setting for Boom
Smooth mode
provides easy operation for gathering
blasted rock and scraping operations. When maximum
digging force is needed, switch to
power mode
for more
effective excavating.
Shockless Boom Control
The PC850-8 boom circuit features a shockless valve
(double-check slow return valve) to automatically reduces
the amount of vibration present when operating the boom.
Operator fatigue is reduced (which can improve safety and
productivity), and spillage caused by vibration is minimized.
Extend and
retract
H
Y D R A U L I C
E
X C A V A T O R
PC850
-8
Smooth
mode
Boom raise
Power
mode
